• DON’T BE THE FALL GUY
WHEN IT COMES TO FLAT ROOFING
• CALL FOR REINFORCEMENTS: IS YOUR
LIQUID ROOFING SYSTEM REINFORCED?
• PROFIT’S IN THE PLANNING: REMEMBER,
IT’S IMPORTANT TO MAKE A JOB PAY!
NFRC Tech Talk
>>> • SAFETY AT HEIGHT • OFF-SITE FOCUS • WORKWEAR • PRODUCT UPDATES >>>
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This month’s issue is packed full of the latest product updates,
interviews, advice and opinions for operatives working in the
roofing and cladding sectors.
BMI UK & IRELAND
An issue that has caused concern for the pitched roofing sector in
recent times is staining on gable end walls caused by water shedding
from some dry verge systems. Despite the introduction of BS 8612,
there is still some concern, and with this in mind, we asked Tom
Woodhouse, Site Services Manager at Marley, to provide his top tips to
prevent this occurring. You can read Tom’s tips on p.24.
Moving to the liquid roofing sector, a key issue for many is the use of
systems without a reinforcement layer. Often billed as being more cost
effective and quicker to install, Sarah Spink, CEO of the LRWA, is keen
to point out this is often not the case. In her article on p.40, Sarah
explains the very real advantages of using a reinforced liquid roofing
system, and the problems that can arise if you don’t.
Elsewhere in this issue, in his latest Perfectly Pitched column, John
Mercer explains the considerations that need to be made when choosing
a pitched roof underlay, including his own research which throws up
some interesting results (p.32); Nick Boulton of TRA provides a checklist
for roofers to ensure the trussed rafters are ready for them to begin
work (p.38); Andrew Bright explains why profit’s all in the planning for
roofing projects (p.42); whilst Peter Johnson urges cladding installers
to let his company take care of the “dirty work” (p.60).
So read on for all this and so much more!
Ceiran Peel-Price is Owner of Peel-Price Construction and operates in the
Wirral area. This month Ceiran answers our Contractor’s Qs on page 26.
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MAY 2019 TC 3
16 DON’T BE THE FALL GUY
The Inspector explains how updates in BS 6229
can prevent you being the fall guy when it
comes to flat roofing
40 REINFORCEMENTS CALL
Sarah Spink explains the advantages of
utilising reinforced liquid roofing systems and
what contractors should look out for
42 PLANNING FOR PROFIT
Andrew Bright says we all enjoy the day job but
it’s important to make a job pay, and to do this
remember the profit’s in the planning...
24 GABLE END STAINING
Tom Woodhouse offers his top tips to ensure gable end
staining doesn’t leave its mark on your project
32 PERFECTLY PITCHED
John Mercer explains the importance of using the
right pitched roof underlay in the right location
38 SHOUT IT FROM THE RAFTERS
Nick Boulton talks through the trussed rafter safety
checks roofers should make before commencing work
46 DRAINAGE DESIGN
Brian Bell discusses what to consider when installing
an efficient drainage system
60 OFF-SITE INSIGHT
Peter Johnson says contractors and installers have less
time and space on site, so companies like his can help...
70 HARD FACTS FOR SOFTWARE
Could you save time and reduce risk on your projects
with the right software? Richard Boston gives his thoughts
4 TC MAY 2019
18 NFRC TECHNICAL TALK
In his latest look at the changes to BS 6229,
Gary Walpole focuses on loading and drainage
22 BUSINESS TALK
We take a look at the issues and protocols when
recruiting staff with criminal records
26 CONTRACTOR’S QS
Finalist in the BMI Apprentice of the Year in 2017
and 2018, Ceiran Peel-Price answers our Qs
74 THE APEX
The response to T Levels has been mixed,
Jackie Biswell gives an overview and her thoughts
06 WIENERBERGER MAKES MOVE
Acquisition of BPD Holdings enables Wienerberger to
expand its roof accessory offering
10 INNOVATION HUB FOR SFS
New hub is designed to connect professionals and new
entrants and enable them to network and learn
MAY 2019 TC 5
SIG ROOFING’S NEXT
Top: Kieren Stevenson; Above left: Samuel Haworth;
right: Megan Boygle
SIG Roofing is supporting 11 apprentices
through the Re:allies Framework, an
initiative which provides smart
procurement to asset management
solutions for social housing projects that
generates efficiencies to directly support
people into training and employment in
their local communities.
SIG Roofing, which supplies products through
the Re:allies planned maintenance
framework to a number of clients across the
north of England, has provided starter toolkits
and ongoing training and mentoring to
support 11 apprentices as well as sponsoring
three of these apprentices who, with SIG’s
support, have overcome barriers and now
gained employment for construction
companies on the Procure Plus Framework.
Kieren Stevenson, Samuel Howarth and
Megan Boygle have been recruited through
Re:vision, supported by its partnership with
local employment groups in the north:
Newground, Achieve and Women and Manual
Trades (WaMT). Find out more at
WIENERBERGER MAKES KEY ACQUISITION
Wienerberger has announced the acquisition
of UK-based BPD Holdings to further expand
its roof accessory offering and complement
its existing roof product portfolio in the UK
As a prominent producer of roof underlays, wall
and construction membranes, building ventilation
systems and specialist roof products, BPD will
become a centre of excellence for innovative
roofing solutions within Wienerberger. BPD will
reportedly be tasked with developing innovative
solutions designed to be implemented and sold
across the broader Wienerberger network,
leveraging the combined regional strengths and
product expertise. With a large product offering
including the Protect, Passivent, Glidevale and
Kingfisher brands, as well as a tailor-made
solutions service, BPD operates two highly
advanced and efficient UK production sites in
Nottinghamshire and South Wales. BPD has over
200 employees and most recently generated
annual revenues of around £30 million.
Heimo Scheuch, Wienerberger AG CEO,
commented: “The UK is one of the strongest and
The importance of proper planning and safe
working practices has once again been
highlighted after a roofing company was
sentenced for safety breaches when a worker
fell about three metres through a rooflight,
suffering a fractured pelvis and spinal injuries.
Leeds Magistrates court heard how, on 17 March
2016, a self-employed roofer, working for PNR
Roofing and Building Services, was on a roof
laying wooden ‘lats’ and roofing felt, when he fell
through a skylight that was covered with felt. PNR
was subcontracted to carry out roof work at Globe
Mills in Slaithwaite. An investigation by the Health
and Safety Executive (HSE) found that whilst PNR
initially provided air bags as a means of mitigating
any falls by employees, the air bags had been
Wienerberger has acquired BPD Holdings to further expand
its roof accessory offering.
most innovative markets for roofing products, and
a key growth area for us as a business. The
acquisition of BPD will strengthen our own
position as a full-range roof systems supplier
thanks to their reputation for innovation and
production expertise. BPD’s specialist roof
accessories are a perfect fit with our existing roof
portfolio and we look forward to being able to
promote them throughout the UK and Europe.”
Wienerberger says its growth strategy is focused
on advancing its market position in the roof,
façade, wall and paver sectors, bringing building
materials solutions for the whole building
envelope to the construction industry.
POOR PLANNING PUNISHED BY HSE
moved to remove debris and the worker hit the
PNR Roofing and Building Services of Park View,
Shafton, Barnsley, pleaded guilty to breaching
Section 3 (1) of the Health & Safety at Work etc
Act 1974 and has been fined £20,000 and
ordered to pay £1,100 in costs. After the hearing,
HSE inspector Chris Tilley commented: “Falls from
height through fragile surfaces and skylights
remain one of the most common causes of workrelated
fatalities in this country and the risks
associated with working at height are well known.
This incident could so easily have been avoided by
simply adopting reasonably practicable safe
working practices such as using netting instead of
relying on fall bags.”
6 TC MAY 2019
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TAYLOR WIMPEY ‘RECOGNISES THE WORK’ OF ITS TRADES
Bracknell Roofing has been named Best Roofing
Contractor by Taylor Wimpey.
The housebuilder held an event for all the trades
that have worked on its projects in London and the
South East, and the Reading branch of Bracknell
Roofing – which is part of Avonside Group Services
– won the roofing contractor award.
The award ceremony was unexpected, according
to Contracts Manager Clive Naish, who said: “We
just thought Taylor Wimpey was having an annual
get-together of all the different trades that support
them to build homes in London and the South East
– so it came as a surprise when they started
handing out awards, but it was a proud moment
when Bracknell Roofing was named Best Roofing
Contractor for 2018.
“It is a great honour to pick up the award because
we know that Taylor Wimpey work with some very
good roofing contractors, who all
do outstanding work – but this
reflects the fact that we work to
the very highest standards of
workmanship and provide very
responsive project management.
This is something that was
clearly recognised by Taylor
Wimpey. The award is a huge boost for the team at
the Reading branch – which is where the company
was originally founded more than 40 years ago –
and it is validation of the standards that we set for
ourselves and how they positively benefit the
customers we work with – whether that’s a small
development of a few dozen homes or large
developments of thousands of new homes.”
The team at the Reading branch also marked the
milestone by remembering their Branch Manager
Kevin Mather, who passed away suddenly last year.
Clive added: “Our delight was
tinged with sadness, as Kevin
should have been with us to
celebrate, as he was well liked
and respected by all those he
L-r: Tain McDonald & Clive Naish.
Divisional Director Simon Smith
of Bracknell Roofing explained: We applaud
Taylor Wimpey for going out of its way to
recognise the work of all the trades who it
works with to build new homes – because it
highlights the high levels of skill and
professionalism right across the industry. The
team at the Reading branch fully deserve this
award, and in light of the difficult time around
the untimely passing of a well-liked colleague, it
highlights that our high standards have never
slipped in supporting customers like Taylor
FMB: QUALITY & STANDARDS MUST BE KEY
Andrew Stephenson MP, the new
sector has widespread support among
Construction Minister, should make it
the industry and homeowners, alike. The
his mission to raise quality and
Government must legislate to stop the
standards in the construction
scourge of unprofessional behaviour
industry through mandatory
blighting the entire industry.”
licensing, according to the Federation
Berry concluded: “With the recent
of Master Builders (FMB).
appointment of a member of the FMB
Brian Berry, Chief Executive of the FMB,
onto the Construction Leadership
said: “I warmly welcome Andrew
Council, we also look forward to
Stephenson into his new role and I look
working with the Minister on
forward to working with him to raise
implementing the Sector Deal in a way
standards, quality and professionalism
that will help to unleash the potential of
in the construction industry. The time is
small to medium-sized construction
right to look at a meaningful way in Stephenson MP, Above: firms.
which we can purge the sector of rogue
“After all, they are the bedrock of the
firms and unprofessional outfits once and for all.
industry, training two-thirds of all construction
With the publication of the Independent Review of
apprentices and forming the supply chain of
Building Regulations and Fire Safety, and the
larger contractors. We must tirelessly work to
quality of some new build homes being called into
remove barriers to SME construction companies if
question, we need to act now to improve
we are to deliver on the Government’s
standards and increase productivity. A mandatory
licensing scheme for the whole UK construction
SPRA’S TEAM GROWS
SPRA Council has welcomed John McMullan
from Firestone Building Products (FBP) onto
the leadership team.
Martyn Holloway, SPRA Chair, said “I am
very pleased to welcome John onto SPRA
Council. His depth of knowledge and
determination to improve the sector and
attract new talent will be invaluable.”
Cathie Clarke, CEO, said “I am delighted that
John is joining the leadership team. He will
play an important role helping to drive our
business plan and representing the EPDM
sector on the SPRA Council. John joins Ian
Muddiman (SIKA), Mike Crook (SIG D&T)
and Steve Downey (DANOSA) as the four
Membrane Representatives on the 12-
strong SPRA Council. Their collective
experience, enthusiasm & knowledge is a
great asset to SPRA and has been a key
element in the growth in influence of this
dedicated and focussed association.”
8 TC MAY 2019
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Above l-r: Stuart Hicks and Mark Flello.
The Liquid Roofing and Waterproofing
Association (LRWA) has appointed a new
Chairman – Stuart Hicks, UK Marketing
Manager at Kemper System, and Vice
Chairman – Mark Flello, Managing
Director of Dove Technology.
Stuart and Mark, who were put forward for
each of their positions by the LRWA board,
were then voted-in by members at the LRWA
AGM in March 2019. As Chair, Stuart will
help guide the delivery of significant new
projects and sector developments with the
support of the LRWA board, its members and
the CEO, Sarah Spink, to continue to help
raise the standards and awareness of the
liquid roofing and waterproofing industry.
Stuart explained: “We have a fantastic
association that is shaping the future of not
just the liquid waterproofing sector, but the
entire roofing industry, which is really
exciting. I’m passionate about making change
for the better – so let us continue our good
work and make a positive impact.”
CEO of the LRWA Sarah Spink, added: “We
are absolutely delighted to welcome Stuart
and Mark into their new roles. Both
individuals have been key players within the
association for many years, and their skillset
and experience complement one another
in these leading roles. We have a busy and
exciting year ahead with new developments
and projects in the making, and having Stuart
and Mark at the forefront of the association will
be a real asset for the LRWA and its members.”
SFS OPENS NEW INNOVATION HUB
SFS opened the doors to its
innovation hub alongside a
distinguished panel of
speakers in May.
The Academy is SFS’s new
learning space at its UK
Above: SFS’s new construction innovation hub.
Directors of key companies
in construction, speakers
from local universities, and
David Wigglesworth, MD of
“The way buildings are
designed and constructed is
headquarters in Leeds. The hub is designed to
connect professionals and the future generation
of construction to trade knowledge, network, learn
and share ideas.
changing and evolving at a faster rate than ever
before,” explained Wigglesworth. “Everybody from
all corners of construction is facing new
challenges, from 5D BIM, to solving the skills
shortage problem, to working collaboratively and
As part of the launch, SFS hosted an evening on
bringing in much needed efficiencies.
2nd May to provide key insight from leading
players across a spectrum of specialities within
the construction industry. Attendees had the
opportunity to learn about topics such as the
future of architecture, developing new talent,
construction 4.0, diversification in the workforce,
and women in engineering and construction.
The event brought together a range of speakers
and the panel included well-known architectural
historian, broadcaster and writer Tom Dyckhoff.
As well as Tom, the panel comprised Managing
“The Academy is one of SFS’s core pillars to help
the industry to focus on these challenges. The
space is designed to share thought leadership
initiatives and allow different professions of
construction to come together.”
The Academy at SFS will be the focal point for
delivering CPDs, hosting networking events,
engaging the next generation of professionals,
while SFS experts will be on hand to provide
product demonstrations and technical insight.
ROOFLIGHTS MADE EASIER WITH NARM
NARM, the National Association of Rooflight
Manufacturers, has launched a new website
which it claims “offers the most
comprehensive independent source of
technical information for rooflight specifiers”.
The National Association of Rooflight
Manufacturers is an active and influential trade
NARM has launched a new website.
association representing manufacturers and
well as providing listings of member companies,
suppliers of all types of rooflights into the UK
latest news and a comprehensive rooflight gallery,
market. Its purpose is to identify and promote
with sector categories.
best practice in rooflight specification,
installation, maintenance and safety.
Full membership criteria for rooflight suppliers
interested in NARM membership, is also available
The new site provides easy access to the
on the new website:
association’s complete library of technical
documents, ‘quick guides’ and case studies, as www.narm.org.uk
10 TC MAY 2019
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READING TECH HUB
FOR BMI GROUP
BMI Group has opened its new Technology
Hub in Reading.
The Hub marks a multi-million-pound
investment in technology and people for BMI
and is part of Standard Industries’ global
mission to “transform the industry”.
Rich Robinson, Chief Technology Officer at
Standard Industries, parent company of BMI,
commented: “Digital transformation is about
empowering the customer by taking the
friction out of buying a roofing system. The
new BMI Technology Hub is part of our
commitment to leverage emerging
technologies and lead the way in becoming a
truly tech-driven building materials and
BMI is making a major commitment to
accelerate the integration of data and digital
capabilities into the manufacturing of highquality
roofing and waterproofing solutions. The
company is also deploying machine learning to
advance and automate its production and
services as well as the development of a
competitive, integrated solar roof.
BMI says its significant investments in
proprietary technologies continue to enhance
the group’s roofing and waterproofing
solutions and services. They enable BMI to
offer innovative platforms that will make
identifying, selecting, delivering and installing
a roofing system a seamless and integrated
process for both the customer and contractor.
Shreyas Mysore, Chief Information Officer of
BMI Group, expressed big ambitions for the
centre’s growth: “The BMI Technology Hub
will grow into a sophisticated centre for
technology and IT innovation. We have many
exciting opportunities for technologists, and
plans to branch into sectors ripe for
technological development and disruption.”
SR TIMBER’S CONSTRUCTIVE BREXIT TALKS
Shaun Revill, SR Timber Trading Director,
joined business leaders to tell Conservative
MP Nicky Morgan about the stark realities that
businesses are facing as the uncertainty
around Brexit continues.
The group, which included the Confederation of
British Industry (CBI), a high street bank and
Sean Revill, SR Timber, and Conservative MP Nicky Morgan.
leading business figures – spoke to Mrs Morgan at
the event at Loughborough University and
Referendum in 2016 was announced, the value of
expressed genuine concern about how Parliament the pound had plummeted against other currencies
and the government are handling what the MP and, again, this had driven up costs, which again,
described as a “political and constitutional crisis”. businesses around the table said they were
struggling to pass on to their customers.
Mr Revill was quick to tell the MP for
Loughborough about the case of SR Timber – Mr Revill took the opportunity to highlight the issue
which is a leading importer of timber products of British Standards. He told Mrs Morgan about the
and the UK’s largest importer of roofing batten. case of roofing batten and how there has been a
rise in the amount of roofing contractors either
He said that since the Referendum in 2016, he
knowingly using materials which are noncompliant
with current British Standards, or are
has faced constant questions from suppliers – in
particular those in SR Timber’s supply chain in
unwittingly purchasing materials that are
the Baltic states – asking what’s happening in
counterfeit, in order to save money.
the UK. He also said that the continued
uncertainty over Brexit means his suppliers are “When I mentioned the case of battens, Mrs
themselves under pressure because the UK is Morgan quite rightly asked the question about
their largest market.
when regulators are being pushed to enforce
standards,” said Mr Revill. “The reality is that
“There are rumours swirling around Europe that
they’re not as robust as they should be. British
the UK will grind to a halt in the days and weeks
Standards have been developed for specific
after Brexit – and this is making our suppliers
reasons – such as the quality of materials – and
understandably very nervous,” said Mr Revill.
they should be adhered to, Brexit or no Brexit.”
Mrs Morgan was quick to point out that the civil
When asked what contingencies businesses
service and government departments have lots of
around the table had taken to plan for Brexit,
plans and contingencies in place, but the group
there was a very clear divide between FTSE
criticised the government for not promoting this
companies and businesses such as SR Timber.
and not communicating this better to countries in
“The CBI said that some of the largest businesses
were spending more than £100m to prepare, and
The group discussed the example of
their boards were spending up to 80% of their
transportation costs of distributing materials once
time planning,” said Mr Revill. “If we did that, we
they arrive at UK ports and many of the
wouldn’t have a business left to run.”
businesses said they had faced rising costs –
which they had to absorb because they couldn’t Reflecting on the event, Mr Revill said that it was
pass them on.
a great opportunity to meet other businesses who
import and share experiences around the
They also discussed how, since the result of the
challenges of importing.
12 TC MAY 2019
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FOR GREEN ROOFS
Shirley Rodrigues, London’s Deputy Mayor for
the Environment, launched a report which
shows the speed with which London has
delivered on its drive to meet its objectives
on climate resilience and biodiversity.
Rodrigues led the Greater London Authority’s
(GLA) Environment Team when the First
green roof policy was included in the London
Plan in 2008: “I have been delighted to
witness the patchwork of green roofs and
walls spreading across London’s skyline,
alongside the establishment of a world-class
industry that is working towards the greening
of London,” said Rodrigues.
The report, produced by the European
Federation of Green Roofs and Walls (EFB),
and livingroofs.org, reveals that the total area
of green roofs in the Greater London area is
equal to 1.5 million m² with a density of
0.17m² per inhabitant, which far surpasses
that of other cities in the world.
Significantly, the density in the capital’s
Central Activity Zone is now a remarkable
1.21m² of green roof per inhabitant.
The new report contains infographics
detailing all the green roofs installed in the
Greater London Area and the Central Activity
Zone (CAZ) as of 2018, with links to
infographics for all the London boroughs
which are published at www.livingroofs.org;
the First ever league table of green roof cities
around the world including London’s CAZ to
provide a snapshot of London’s comparative
performance; a review of global green roof
policies in cities around the world; new
evidence of the benefits and economic case
for green roofs and walls; an appraisal of
how various London boroughs are delivering
green roofs; and 17 case studies of green
roofs and walls in London.
TRAINING KEY FOR FORMER BMI AOTY
The BMI National Training Centre welcomed an
old friend, when roofer Ceiran Peel-Price
attended one of the centre’s flat roofing courses.
Ceiran is no stranger to the BMI National Training
Centre as he was a finalist in the pitched roof
category of the annual BMI Apprentice of the Year
(AOTY) competition in both 2017 and 2018. After
completing his apprenticeship, and with the
confidence and insight gained through the
competition, Ceiran successfully set up his own
business and is now seeking to add flat roofing
installation to the company’s services. Of BMI’s
available courses, Ceiran opted for an
Introduction to Single Ply Roofing.
With 2018 delivering the completion of the flat
roofing training area, and the refurbishment of the
existing pitched training facility, the BMI National
Training Centre was an obvious choice for Ceiran
when looking to improve his skillset: “Being part
of the BMI Apprentice of the Year competitions
really taught me a lot and meant that BMI was a
natural place for me to look for training as I am
expanding my business. They not only gave me a
great boost to my confidence, they also really
Above: Ceiran Peel-Price took part in BMI’s Apprentice of the
Year and returned to BMI’s National Training Centre to carry
out flat roof training as owner of his own business.
inspired me to push on with the next stage of my
career. The facilities here are excellent, and the
quality of training is superb.”
Mat Woodyatt, BMI Technical Training Manager,
said: “It’s great to see Ceiran back, and I’m really
proud that, not only has BMI been part of
inspiring him to set up his own company; but also
that he sees us as a ‘go to’ provider for new
skills. Our BMI Apprentice of the Year awards are
part of our commitment to help ensure that new
entrants to the sector receive the necessary
levels of support that they need to develop and
succeed. Ceiran is absolute proof of that, and we
couldn’t think of a better candidate to attend one
of our flat roof training courses.”
Ceiran takes part in Contractor’s Qs on p. 26.
NEW APPOINTMENT AT MADE FOR TRADE
Jonathan Fletcher has joined
Made for Trade as Business
Going forward, Jonathan’s
appointment will help ensure the
successful roll out of all MFT
products. However, customer
support and guidance will be
Bradley Gaunt (left) welcomes
Jonathan Fletcher to the team.
area for Jonathan is the Midlands
and he will be focusing on existing
customer support, retention and
Jonathan explained: “I’m looking
forward to increasing awareness
of the Made For Trade brand
through strategic marketing
crucial as Made for Trade continue to invest in
research and design of new systems. With over
20 years of business to business experience in
national sales roles, Jonathan brings a wealth of
experience to the position. Alongside supporting
the Made for Trade team at this year’s FIT Show,
his immediate goals will be on the road visiting
existing clients and offering support. The first
avenues, whilst also increasing face time with
our customers. I have known of Made for Trade
for some years now, so as soon as the
opportunity arose I was keen to get on board. The
fact that Made for Trade has a strong ethos
towards developing market leading products gives
me confidence that this role will be an exciting
and enjoyable one for me.”
14 TC MAY 2019
An Inspector Calls
DON’T BE THE FALL GUY WHEN IT
COMES TO FLAT ROOFING
In our regular monthly column – ‘An Inspector Calls’ – Total Contractor has teamed up with
the experts at BMI UK & Ireland to help you avoid the common pitfalls that can often cost
you both time and money, and ultimately help you achieve roofing success.
This month, the Inspector looks at how
updates in BS 6229:2018 can stop you
being the fall guy when it comes to flat
One of the most eye-catching amendments in the
revision of BS 6229:2018 was the reference to
falls. This is now much clearer, stating that “all
flat roof surfaces (including gutter beds) should
be designed with a fall of 1:40 to ensure finished
drainage falls of 1:80 are achieved. This should
take account of construction tolerances,
permitted deviations and deflection under load,
and account for deflections/settlement.”
In other words, any design should allow for all
factors that could reduce or hinder the drainage,
eliminating the risk of ponding on roofs. Without
these considerations, it is highly likely standing
water will occur. Although improvements in
membrane technology and performance have
increased significantly, standing water may still
result in additional and unnecessary stresses in
the membrane, particularly in the winter when
that standing water freezes. Furthermore, in the
event of a defect being present in the area of the
ponding, greater water ingress will occur when
compared to a well-drained roof.
Accelerate the ageing process
Standing water is typically defined as water that
remains on the roof for longer than 48 hours, and
whilst this is not an immediate threat, it can
accelerate the natural ageing process and have a
detrimental effect on the membrane’s lifespan.
It’s possible that standing water can still occur
even when the structural deck has a fall within it,
as compressed insulation,
blocked or faulty drainage
and damaged membranes
can all contribute
towards this issue too.
can therefore reduce
this risk, alongside
reducing the number and
weight of items permanently
stored on the roof. Another
contributing factor could be the
sequencing of membrane laps and edge details
sitting proud of the finished floor level,
consequently reducing the water’s ability to
navigate past the resulting water-check.
The reference to falls is all the more pertinent
given that, these days, there are certain thirdparty
certified waterproofing and insulating
Above: Ponding can shorten the life of a roof. Below:
Standing water due to lack of fall.
systems that have gained
approval for use with zero
falls. Hot melt systems
in particular are
popular for this area
of work. For these
systems, zero falls
are acceptable, but
negative falls are not, so
should be corrected. It is
not really acceptable in this
day and age for any contractor to
install roof decks with large depressions, back
falls and non-draining areas.
To ensure a zero fall finished surface i.e. one that
is totally flat, a design fall of 1:80 should be
used, along with a detailed structural analysis to
account for construction tolerances, settlement
and deflection under load.
If sites have negative falls, thereby increasing the
likelihood of ponding, then remedial action has to
be taken before the roof system is applied. This
could be by laying a localized screed to falls and
firings, fitting tapered insulation or fitting
additional rainwater outlets at the lowest points.
As a result, the roofing contractor should expect a
flat, properly drained surface on which to lay the
specified system and the finished roof should not
suffer from ponding or inadequate drainage.
Contact BMI National Training Centre
@_Redland / @Icopal_UK
16 TC MAY 2019
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NFRC Technical Talk
SUMMARY OF CHANGES TO BS 6229
PART 2: LOADING & DRAINAGE
Gary Walpole, NFRC Technical Officer, continues his review of the changes to BS 6229, the
Code of Practice for flat roofs.
BS 6229 (Flat roofs
waterproof coverings. Code
of Practice) was last updated
in 2003 and much has
changed within the industry in
the last 15 years. The revised
BS 6629:2018 describes best
current practice in the design,
construction, care and
maintenance of roofs with a flat or
curved surface, at a pitch not
greater than 10 degrees to the
horizontal, with a continuously supported flexible
Last month I explained what the main changes
were in relation to the different flat roof buildups;
this month I look at loading and drainage:
The roof structure should be designed for the
strength of the specified waterproofing and take
into account any added surfacing including green
roofs, paving slabs, gravel, blue roofs for
rainwater retention, or any mechanical or
electrical equipment which may be situated on
the finished roof.
Achieving drainage through roof fall
Ponding water adds a dead load to the roof
structure and in exposed warm roofs increased
stresses in the waterproofing layer, therefore, a
minimum 1:80 finished fall is recommended to
both the general area of the roof and to any
formed internal gutters.
BS 6229 recommends that all flat roofs should be
designed with a fall of 1:40 to ensure a 1:80 fall
BS 6229 has been revised and there are a
number of changes that roofers need to be
is achieved once the
roof is completed.
This design criteria
gutters and should
take account of
settlement and for deflection
under load, both during and
Certain third-party certified
waterproofing and insulating
systems are approved for use with zero falls, but
back falls are not acceptable. To ensure a
finished surface with a zero fall, a design fall of
1:80 should be used and a detailed structural
analysis should account for construction
tolerances, settlement and for deflection under
load. Where areas are found by a site level survey
to have negative falls, ponding water will occur.
This will need to be corrected through the
introduction of an additional outlet or localised
screed to falls.
To prevent ponding caused by waterproofing
system lap, build ups around rainwater outlets,
rainwater outlets should be recessed into the slab
/ deck or fitted in sumps when it is practicable to
The design of most flat roofs should ensure
rainwater is drained from the roof as quickly as
possible. However, some roof finishes are
designed to control the disposal of rainwater from
the roof. For example, green roofs are designed to
support planting, and blue roofs are designed to
attenuate the drainage of rainwater. These roofs
Left: Gary Walpole, NFRC.
may require additional rainwater
design considerations. All blue
roofs and roofs that drain into a
single internal rainwater outlet or
combined outlets connected to a single
downpipe, should also be fitted with a visible
overflow to drain and alert the building user of
any blockages to the rainwater outlet.
Door threshold and upstand details
The minimum height of all upstands and
abutments from the finished waterproofing
system remains at 150mm. However, if level
access is required from within the building, as in
the case of a door opening onto a balcony or
• The height of the clear upturn under the door
threshold may be reduced to not less than 75mm.
• The waterproofing should be fitted before fixing
the door threshold.
It is important that the roof is designed with the
rainwater falling away from the door, and in cases
where there is an internal outlet or through-wall
• An overflow must be fitted a minimum 25mm
below the height of the door threshold to prevent
water ingress into the dwelling in situations of
blockages to the outlet.
• The height of the upstand must return to
150mm above the finished roof level beyond the
Contact the NFRC
020 7638 7663
18 TC MAY 2019
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The choice of roof materials for a new project is vital and there is much to consider.
However, with the focus very much on the physical components of a roof, it’s all too easy to
overlook its overall life expectancy and any warranties that may cover the products. Andrea
Ramirez, Product Manager at SIG Roofing, discusses the benefits behind using single
When planning a project, decisions need
to be made on which products to use,
their colour, size and texture, along with
any planning restrictions, and of course the
budget. Roofs are made up of multiple products,
so the choice of roof coverings, fittings, fixings,
breather membrane and batten for example, will
also be carefully considered.
“Things do go wrong,
and when they do, you
need the reassurance
that the manufacturer
or supplier will stand
by your claim”
Naturally, as roofers and contractors, you want to
get the roof just right, especially the aesthetic as
it accounts for 20-30% of the visible exterior and
will determine the appearance of the property for
decades. However, if it fails to meet requirements
or a fault occurs and you’re required to make any
repairs necessary, you will find yourself making a
claim. Things do go wrong, and when they do, you
need the reassurance that your roofing products
can be relied upon in the event of defect or
failure, and that the manufacturer or supplier will
stand by your claim. Otherwise, not only could a
claim prove costly, it can seriously discredit your
Thankfully, over the years, roofing products have
become more advanced, and with the quality and
reliability increasing, most products come with a
standard twelve-month warranty – if not longer.
This said, research has shown that 70% of
contractors have had to replace a roofing product
through a warranty claim at some
time or other. Therefore, you need
to be confident that the warranties
offered by the products you choose
are comprehensive and robust.
Whether it’s a new roof, an extension or
even a repair, it’s rare that only one product
will be ever used. Warranties are
normally issued separately for
each product, so that means
several warranties to manage
too. Keeping track of every
warranty and storing them safely
can be a job in itself. So, imagine
having to deal with multiple suppliers
in the event of a claim? It can be difficult, timeconsuming,
and downright frustrating and can all
add up to lost revenue. Single package warranties
take the headache away and offer a number of
valuable benefits; the key attraction is simplicity.
When a single package warranty is purchased,
just one warranty covers the performance of the
key products involved in the build-up of a roof –
in some cases up to 15 years. In the unfortunate
event of a claim, there’s just one company and
only one contact to deal with at any time
throughout the process.
In a move to provide additional support to
contractors, SIG Roofing has extended its ONE
Warranty scheme to provide 15-year coverage for
flat roofing products as well as those for pitched
Since its launch in 2015, ONE Warranty has gone
from strength to strength with contractors signing
up to the single package product guarantee,
which is designed to support the products
Left: Andrea Ramirez, Product Manager at
Contact SIG Roofing
0845 612 4304
involved in the build-up of the roof
from batten to roof coverings.
Now, with coverage extended to
include flat roofing products, the free-toregister
product warranty gives contractors
greater value and an even stronger
offer to put to their customers.
The simplicity of the ‘onepartner
covers all’ ONE
Warranty scheme takes away
that inconvenience, while
property owners have peace of mind
knowing their roof is covered, which in turn
gives them greater confidence in the contractor.
“Contractors can then
easily create a
warranty for their
Contractors wishing to take advantage of ONE
Warranty simply have to register online
at www.sigroofing.co.uk/onewarranty. Once
registered they will receive membership details
and marketing materials to use with their
customers. Contractors can then easily create a
warranty for their project online, following the
purchase and installation of products, for ONE
Warranty to take effect.
20 TC MAY 2019
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PROS & CONS OF RECRUITMENT
We take a look at the issues and protocols when recruiting individuals with criminal
Arecent study, conducted for the Scottish
Centre for Crime and Justice, found that 11
million people in the UK have a criminal
record and that 75% of employers admit to
rejecting a job applicant once a criminal
conviction is disclosed.
With this in mind, what is the law surrounding
employees with criminal records, and what can
employers do to ensure they are asking the right
questions at the right time?
According to Mark Stevens, a Senior Associate at
VWV, it’s important to note that an employer can
obtain information on a person’s criminal record:
“They can do so in one of two ways – either by
asking the candidate or employee directly, or by
requesting an official criminal record check by the
Disclosure and Barring Service (DBS).”
The treatment of individuals with criminal records
is set out in the Rehabilitation of Offenders Act
1974 (ROA 1974). This Act provides a system for
the records of people with convictions to be
Subject to certain exemptions, a person whose
conviction is spent is entitled to hold themselves
out as a having a clean record – only ‘unspent’
convictions need to be disclosed. However, even
with unspent convictions it is worth bearing in
mind an applicant may not disclose this
Stevens advises that if an individual has a spent
conviction and they choose not to disclose it
“A person whose
conviction is spent is
entitled to hold
themselves out as a
having a clean record”
when questioned, subject to certain exemptions,
“they cannot be subjected to any liability or
prejudice for their failure to disclose, and this
would include an employer not hiring them.
Failure to disclose a spent conviction is not a
lawful ground for dismissal.” An employee
dismissed on these grounds may bring a claim for
The Rehabilitation of Offenders Act 1974
(Exceptions) Order 1975 identifies that in certain
cases spent convictions should be disclosed. The
Order sets out certain occupations, offices and
professions where the disclosure of spent
convictions can be required:
• Professions such as medicine, lawyers,
accountants, vets, chemist and opticians;
• Those employed to uphold the law, including
judges and prison officers;
• Certain regulated occupations, including the
• Those who work with children and vulnerable
• Those whose work could pose a risk to national
If an applicant fails to disclose a spent conviction
in these circumstances, an employer will have a
valid reason for withholding or withdrawing an
offer of employment or dismissal.
Disclosure and Barring Service
As mentioned earlier, an alternative to asking an
employee about their past is for an employer to
obtain information on an individual’s criminal
record via a DBS check which will include all
spent and unspent convictions, and avoids the
need to rely solely on an individual’s voluntary
22 TC MAY 2019
There are two main types of DBS checks,
standard disclosure and enhanced disclosure.
Stevens reminds employers that they “should
remember when considering requesting a DBS
check that this can only be requested if the
individual in question is to undertake a role set
out in the Exceptions Order.”
He explains that “if a DBS certificate discloses
convictions, employers should be careful not to
respond in a knee-jerk way when deciding if the
individual is suitable for a role.” His reasoning is
based on a recent case where, in January 2019,
the Supreme Court found that the way that
criminal records were disclosed to employers
infringed an individual’s right to private life: “It
has been reported that the Supreme Court’s
decision was that the criminal records disclosure
scheme was disproportionate in certain respects
– specifically in respect to the requirement that
all previous convictions should be disclosed,
(regardless of how minor they might have been),
where the person has more than one conviction,
and also in respect to young offenders. The
repercussions of this case remain to be seen –
but it could lead to significant changes to the way
that the DBS system works.”
Employers should keep in mind that information
on a person’s criminal record is personal data
and cannot be processed unless there is a lawful
basis for doing so. As well as having a lawful
reason for processing the data, an employer
should also comply with the data protection
principles which includes making sure the
processing is adequate, relevant and not
An applicant has a criminal record
As to how to react if a conviction, spent or
unspent, is disclosed, Stevens suggests that an
employer's response should depend on the
individual circumstances, regardless of how the
information is obtained.
“If the conviction is spent and the position
applied for does not fall under the Exceptions
Order, the employer may not refuse to employ the
‘Be careful who you employ’
Firms in the sector need to be careful who
they employ. Take the 2007 case of roofer
Anthony Robert Turner who was convicted of
theft and money laundering after stealing
cheques from an 80-year-old woman when
working on her house.
In 2012, roofer Joe Crossley was jailed after
“It may not always be
appropriate for an
employer to ask
individual on the basis of the conviction. If the
conviction is spent but the position falls under the
Exceptions Order, then an employer may refuse to
employ the individual. When dealing with
positions which fall within the Exceptions Order,
due regard should be given to industry and
sector-specific guidance as this will often set out
how an employer should proceed. If the
conviction is not spent, the employer may refuse
to employ the individual, but again, appropriate
regard should be given to any sector specific
A current employee did not disclose
Looking at the issue from the perspective of an
employee, Stevens says that here too, “an
employee is entitled to withhold a spent
conviction, subject to the exceptions, and it is
likely that if an employee with qualifying service
is dismissed for this reason the dismissal will be
He adds that if a person has deceived their
employer about a criminal record and they were
not entitled to withhold the information, i.e they
have an unspent conviction or the exceptions to
ROA 1974 apply, then the employer may
terminate their employment contract for
breaching the implied term of mutual trust and
confidence. But he offers a note of caution: “Care
pleading guilty to stealing tiles from churches
across Wiltshire, causing thousands of
pounds worth of damage.
And in 2017, roofer Richard Cakebread who
stole £88,000 through VAT fraud and evaded
£14,000 in income tax was jailed following an
HMRC investigation. Cakebread charged VAT
on invoices he sent to clients and used a VAT
number which had been deregistered in 2009.
should be taken where an employee has sufficient
qualifying service to bring an unfair dismissal
claim as an employer will need to show that
dismissal was within the band of reasonable
responses.” He says that in considering this an
employer will want to think about the employee’s
performance record as well as whether or not the
conviction was relevant or particularly serious.
As can be seen from the recent research
published and the legal considerations when
requiring criminal records are disclosed, it may
not always be appropriate for an employer to ask
applicants about criminal convictions.
If an employer chooses to continue to ask for
criminal records information in their application
form, it should consider writing a detailed
recruitment policy with a section on the
recruitment of ex-offenders that explains how the
suitability of candidates with a criminal record is
assessed. This could include the nature of the
offence, the relevance to the role applied for, how
old the offence is, and whether an individual’s
circumstances have changed since it was
Employers can also continue to reject
applications on the basis of a criminal record
without taking these steps. However, giving more
thought to the situation may open up a wider
range of suitable candidates for a role.
What are your thoughts on recruiting or working
with people with criminal records? Email the
Editor at firstname.lastname@example.org or tweet
MAY 2019 TC 23
PREVENTING GABLE END STAINING
By Tom Woodhouse, Site Services Manager at Marley.
Despite the introduction of BS 8612, the Dry Fix Standard, there is still some concern in the
industry about staining on gable end walls caused by water shedding from inferior, incompatible
or incorrectly installed dry verge systems. Gable end staining not only looks unsightly, but left
unchecked, saturated walls can leave the bricks at risk of frost damage.
Part of the reason for BS 8612’s introduction was to eliminate this problem and the Standard includes
some strict tests for dry verge products. This means that a compliant system must not allow water to
discharge in one or more concentrated, continuous or intermittent streams on the wall. However,
random splashes are acceptable. So, while in theory, using a BS 8612 compliant dry verge system
should prevent any gable end staining, in order to do so it must be fitted in accordance with
manufacturer instructions. However, it’s important to remember, even between compliant systems there
will be differences in performance. For example, some will have built-in drainage features, or have
batten end clips that make them easier to fix securely.
Here’s Tom’s top tips to prevent gable end staining:
Tom Woodhouse, Site Services Manager at Marley.
“Choose a dry verge
system that has an
integral design feature
to drain water away
from the wall”
1Never use a dry verge system that is not
BS 8612 compliant. This means that it
hasn’t been tested to meet the minimum
quality required by the British Standard.
2Choose a dry verge system that has an
integral design feature to drain water away
from the wall. For example, both our
Ashmore and Universal Dry Verges have been
designed and tested to protect against gable end
staining, with multiple drainage channels to direct
water away from the wall.
3Always follow the manufacturer
instructions. Even if you have fitted similar
products before, check the instructions as
failure to do so could lead to an inadequate fix or
water shedding and invalidate any warranty. All
verge tiles should be mechanically fixed in
accordance with BS 5534 in addition to the use of
the universal dry verge units, i.e. by nailing,
clipping or screwing as appropriate.
4Having a continuous bargeboard can add
further protection, by making sure the
verge is positioned out from the brickwork.
However, as part of BS 8612 requirements, our
dry verge products are tested without a
bargeboard present – so contractors can have
peace of mind they will drain water effectively
with or without a bargeboard.
5Minimise the risk of incorrect fixing by
choosing a system that is simple to install
to British Standards. For example, a dry
verge system that includes a batten end clip
makes the mechanical engagement required
under BS 8612 much simpler. Our batten end clip
has sharp teeth which grip into the batten,
making it extremely secure, as well as being very
quick to push or hammer into place. Unlike others
on the market, it can be fitted after the roof has
6Take extra care with eaves closure units or
starter verges, and always follow
manufacturer instructions. Depending on
the design, it can be particularly difficult to fix the
eaves closure unit adequately. This can lead to
roofers having to improvise to gain a secure
mechanical fix, using things like brick ties to
achieve a suitable fix into the fascia or roof
substructure. To prevent this, our Universal and
Ashmore Dry Verges incorporate a quick starter
verge fixing method that can be installed easily,
regardless of any obstructions such as gutters.
This provides an easy-to-install, robust method
of securing the first verge unit, even when there
are no bargeboards. This also gives the site
manager visual confirmation that the verge has
been installed correctly.
7For refurbishment work, you need to make
sure there are no undulations where the
dry verge will be installed. Any roof dipping
at the edges can cause excessive water run-off,
so you may need to adjust the battens
underneath to make it flatter.
8Compatibility is crucial. Many dry verge
products are sold as universal but they
have different levels of compatibility so it
is important to check this. Our Universal Dry
Verge is compatible with all three main
interlocking tile types; large standard, medium
format (15” by 9”) and large format thin leading
edge. Our Ashmore Dry Verge has been designed
to complement the Ashmore double interlocking
plain tile but it is also fully compatible with other
interlocking plain tiles on the market.
24 TC MAY 2019
“NO POINT IN HAVING THE GEAR IF
YOU’VE GOT NO IDEA!”
After leaving the army, Ceiran Peel-Price began renovating his own home which sparked a real
interest in construction. This led to him completing an apprenticeship, including consecutive
years as a finalist in BMI’s Apprenticeship of the Year competition, then ultimately establishing
his own business, Peel-Price Construction. Total Contractor caught up with Ceiran to hear about the
lessons he’s learned, dealing with very particular customers and why knowledge is key...
questions for Ceiran Peel-Price
“I’ve asked for help and
it’s always been there
but if you don’t you can
find yourself in a
TC: What was your path into roofing and
to your current position?
CP-P: When I came out of the army I started
renovating the house we were in and it was
brilliant taking things down but I wanted to learn
how to rebuild them. I started off with a brickwork
course while I had operations on my knees and,
when my knees were healed and I’d finished the
brickwork course, I started off as an apprentice with
Les Perry Roofing and then I set up on my own.
TC: If you had one piece of advice about
starting a roofing business, what would it
Images, clockwise from top: Ceiran Peel-Price moved into
construction after serving in the army; He has been a finalist
twice in BMI’s Apprentice of the Year competition which has
helped provide him with the skills and confidence to set up
his own roofing business.
CP-P: Never be afraid to ask for help. I’ve asked
for help and it’s always been there but if you
don’t you can find yourself in a corner. I’ve taken
on jobs where I didn’t have the full set of skills
but asked people to work with me and they’ve not
only done the job but taught me along the way.
TC: Tell us about a current project you’re
CP-P: I’m on with a really big
house in Heswall – nine
bedrooms. It started off as
just a small repair and then,
when I got there, the
customer said they wanted
to replace all the ridge tiles,
the fascias, soffits and the
gutters – they didn’t like the colour. 250 metres
worth – it’s huge.
TC: You mentioned your apprenticeship:
was that worthwhile?
CP-P: Absolutely. It worked out brilliantly for me
and, for example, I was a finalist in the BMI
Apprentice of the Year competition twice – first in
2017, and again in 2018. The
competition taught me a lot and
was one of the things that
encouraged me to set up my
own business. It also taught
me the value of quality
training. The facilities at BMI
are excellent, and I’ve recently
undertaken some of their flat
26 TC MAY 2019
oofing courses to help grow the business.
TC: What about difficult customers? Any
situations that stand out that you can tell
CP-P: I haven’t had one that was difficult in an
angry way, just one that was very particular. I had to
go to nine suppliers to get the right material that
they wanted and then ended back with the first one.
They were trying to match into brand new windows
they were installing but there was no match.
TC: What’s the most frustrating thing
about your job?
CP-P: Fixing mistakes where people haven’t
known what they’re doing. Sometimes I just don’t
know how they got away with it.
TC: And the most satisfying?
CP-P: Helping people out because when they
have problems with their roof it’s not something
they can sort out themselves.
Above: Ceiran Peel-Price.
TC: What’s your most important tool as a
roofing contractor, either in the office or
CP-P: Knowledge. No point in having the gear if
you’ve no idea.
TC: What’s the best social media platform
for you as a roofing contractor?
CP-P: I use Facebook. I put current jobs up there
and customers leave feedback too. I’ve recently
offered Bluelight discount for NHS staff and
people in the forces and put that on the Facebook
page and got a strong response.
“When they have
problems with their
roof it’s not something
they can sort out
TC: How has the start of 2019 been and are
there reasons to be positive for the remainder
of the year?
CP-P: January/February were quite quiet but I
expected that and now work’s coming in thick
and fast, so I’m very positive for the future.
Total Contractor will keep you up-to-date with
the finals of the 2019 BMI Apprentice of the Year
which will be held at the beginning of July.
Contact Peel-Price Construction
ther inf ormation
or a hire quotation call
MAY 2019 TC 27
PART 3: SMARTER MAINTENANCE
In the final instalment of our series from Dakea, Lee Griffiths looks at the maintenance
advice roofing contractors should pass on to their customers.
Homeowners tend to concern themselves
with the upkeep of their interior space,
often forgetting the importance of
maintaining products that are part of the building
fabric. By advising homeowners on the value of
sustaining a schedule of maintenance that
includes the upkeep of the glass, frame and
gutter roofing, contractors can help customers
avoid costly repair and replacement work.
Dirt can quickly build up on the outer pane due to
a range of factors. Often blamed on rainwater,
this is actually a common misconception as it
contains almost no particles, which means it
cannot make the window dirtier. The main
contributors to a dirty window are from things
such as airborne contaminants, pollen,
windswept dirt from vehicles, and even from
animals such as birds or squirrels.
Most roof windows come with a rotating sash,
which allows homeowners to easily clean the outer
window from inside their house. This involves
using a soft, clean, lint-free cloth, a chamois
leather, non-abrasive sponge or non-metal window
squeegee and water to quickly wipe down, making
sure they avoid contact from silicone with the
pane. For hard water areas, a small amount of
detergent is recommended to soften the water or
wipe off excess water after cleaning.
However, thanks to continuing innovation, there
are glazing units now available on the market that
can provide an unparalleled reduction of dirt
build-up on the external surface of the window, by
using rain itself. Units of this nature have a
microscopic titanium dioxide applied directly to
the surface of the glass. When exposed to
sunlight, the coating uses a photocatalytic
process to break down and disintegrate organic
dirt. Then, when it rains, instead of leaving streaks
“By properly advising customers on the
maintenance required, roofing contractors can
reduce the lifetime cost of the product”
in any settled dirt, it is simply washed away.
In addition, the glazing tends to dry quicker, which
reduces the chances of water streaks, leaving the
customer with clear windows and no
Maintain the frame
It is important to make customers aware that
taking care of the window frame, particularly
timber ones, is important to ensure the wood
does not become affected by damp. This could
cause the frame to swell and become deformed –
creating damage that is costly to fix and
compromises the watertightness of the window.
External factors that can cause this include rain,
freezing temperatures and exposure to ultraviolet
radiation. Internal moisture can also be a problem,
as high humidity areas can cause condensation to
occur on the inner surface of the window.
To reduce the chance of damage to the frame,
roofing contractors should make sure they select
a product from a manufacturer that carries out a
treatment process on the timber before
installation. For example, this could be demoisturising
the wood to protect against
deformation of the frame, and a specialist double
layer coating to help ensure a durable surface.
When it does come to treating the window again,
customers should be advised to apply a simple,
even coat of water-based lacquer to the wood
every four years and whenever additionally
required. However, higher humidity areas of a
property, such as bathrooms and kitchens, will
require treatment every two years.
If the frame at any point requires cleaning, this can
be completed with warm soapy water – but it is
important to advise customers that cleaning more
frequently may increase the need for re-lacquering.
In addition, if an electrical opener has been
installed and needs to be cleaned, a damp cloth
and standard detergents are fine to be used, and
the chain should be greased annually to keep it
Concerns in the gutter
For the small gutter above the window, advise
your customers that they do not require any extra
maintenance or care. All that is required is a
periodic clean to remove any blockages to allow
rainwater to flow freely, which can be done at the
same time the rest of the gutters on the property
are cleaned. Additionally, if any external roller
shutters are installed they can be cared for easily
with a quick clean with soapy water.
Roof windows are a significant investment in a
property, and as such are expected to last for many
years. While many roof windows come with lengthy
guarantees, if they are kept in good condition they
can often last much longer than this. By properly
advising customers on the maintenance required,
roofing contractors can reduce the lifetime cost of
the product for the homeowner, leaving them with
a high quality installation that looks good and
works as intended.
020 3970 5080
28 TC MAY 2019
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KNOW WHICH WAY THE WIND
BLOWS: PITCHED ROOF UNDERLAYS
Roofing Consultant John Mercer – writing on behalf of Edilians – explains what needs to be
considered when choosing a pitched roof underlay, and the importance of getting it right.
The primary functions of pitched roof
underlays are to a) provide a completely
waterproof barrier to prevent water from
entering the building and b) take a share of the
wind load to reduce the uplift forces acting on the
roof tiles. Another function of vapour and airpermeable
underlays is to assist in preventing
harmful condensation in the roof space.
In this article, I will deal with point ‘b’; i.e. how
the underlay must act to share the wind uplift
loads on the roof system.
A barrier to reduce wind uplift
BS 5534 stipulates that pitched
roofing underlay should provide a
barrier to reduce the wind uplift
load acting on the tiles. If the
underlay cannot sufficiently resist
the wind uplift load, then a greater
share is borne by the roof tiles, possibly
resulting in dislodgement of the tiles. The share of
the wind load borne by the underlay is
considerable, therefore the underlay must be of
suitable strength to resist these uplift forces. An
“The share of the wind load borne by the underlay
is considerable, therefore the underlay must be
of suitable strength to resist these uplift forces”
Left: John Mercer, Pitched Roofing Technical
underlay must always be
specified that is appropriate for
the design of building and,
importantly, its location.
Underlays are usually classified in
accordance with their geographic location and
wind zone in the form of a UK Zonal
Classification Table on the packaging. The UK is
divided into 5 wind zones, with lowest wind
speed, Zone 1, being centred around London and
the south of England, up to Zone 5 covering the
very far north of Scotland (see Wind Zones map
When choosing an underlay, designers and
When choosing a pitched roof underlay it is important to always check if a project is likely to exceed any of the Zonal Classification Table’s conditions (see table on next page).
32 TC MAY 2019
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• Ceiling must be well sealed
• Ridge height must not be greater than 15
• Roof pitch must be between 12.5º and 75º
• Site altitude must not be greater than 100m
• There should be no significant topography
“If there is any doubt
about the suitability of
an underlay for any
particular site or
project, obtain the
actual underlay uplift
installers must be mindful of the list of criteria
that apply to underlay Zonal tables. These are as
• The ceiling must be ‘well sealed’, as defined in
BS 9250 (referred to as ‘continuous’ in BS 5534)
• The ridge height must not be greater than 15
• The roof pitch must be between 12.5º and 75º
• The site altitude must not be greater than 100
• There should be no significant site topography
(as defined in BS 5534)
Wind uplift calculations
Where a project falls outside any of these
parameters, the predicted wind load may exceed
the maximum declared load resistance in the
Zonal Classification table for the location.
In these cases, it is a requirement of BS 5534
that a wind uplift calculation is performed to
determine what strength the underlay needs to
Some concerns have been raised recently that
these exclusions are not always considered
Above: Wind zones map.
when choosing an underlay. Many roofing
projects fall outside these parameters, possibly
because the ceiling isn’t well-sealed or perhaps
the ridge height is higher than 15 metres.
Similarly, there are many areas in the UK that
are much higher than the site altitude restriction
of 100 metres.
In view of these concerns, I ran some test wind
uplift calculations for actual development sites
close to where I live. The results were alarming. I
live in an area where the height above sea level is
much greater than 100m and many locations can
be described as having significant topography due
to the hills and valleys in the area.
For two sites, I found that the predicted wind
load far exceeded the maximum load resistance
given in the Zonal Classification Table for the
area. This means that, certainly for these
locations, it is not possible to use an underlay
that only achieves the uplift resistance given in
the Zonal Classification Tables for the location.
Therefore, it would be necessary to use an
underlay that has a higher uplift resistance.
In summary, it is important to always check if a
project is likely to exceed any of the Zonal
Classification Table’s conditions. If there is any
doubt about the suitability of an underlay for any
particular site or project, obtain the actual
underlay uplift resistance value figure.
Alternatively, use an underlay that is classified for
unrestricted use in all UK wind zones, such as the
range of Tyvek Supro underlay systems.
“For two sites, I found that the predicted wind load
far exceeded the maximum load resistance given
in the Zonal Classification Table for the area”
Contact EDILIANS / John Mercer
34 TC MAY 2019
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Flat Roofing Solutions
Matthew Bailey, Divisional Manager, Inspection and Certification at HCL Safety, explains
why it is essential for companies to install fall protection equipment when required and
properly look after it once it’s in place.
Ultimately, lives depend on height safety
systems. That in itself should be reason
enough to ensure that equipment is
properly installed, regularly maintained and
thoroughly serviced. You wouldn’t board an
airplane knowing that it hasn’t been regularly
checked and serviced. Why should fall protection
equipment be any different? The consequences of
equipment failure can be just as severe.
The continued upkeep and regular maintenance of
fall protection equipment are both important
contributing factors that help ensure systems
carry out their intended purpose when required:
saving lives. Any fall protection system should be
checked and maintained by experienced,
competent professionals according to relevant
European or British standards, as well as
Factors that can affect the safety system
There are a variety of factors that can potentially
impact the performance of fall protection
equipment, from general wear and tear to poor
weather and flying objects or operative misuse.
Some are somewhat expected while others are
unforeseen. Either way, they all highlight the
importance of regularly checking and maintaining
your fall protection equipment. Failure to do so
could compromise the functionality of the system
and ultimately affect end-users.
Responsibility for the upkeep of fall protection
equipment typically lies with the building owner.
They have an obligation to ensure that processes
are in place to effectively maintain the
equipment. This includes regular servicing and
annual inspection and certification. Building
owners should also educate themselves as to the
legal and moral safety obligation they have for the
safety of those that work at height. If in doubt or
that it’s a
human life at
risk if they fail
to implement a
protection regime and
properly look after
in need of support, consult experienced
professionals like HCL Safety. Ignorance is not a
valid excuse when people’s lives may be at stake.
Risks faced by companies that don’t
properly maintain their equipment
The negative implications associated with
building owners not fulfilling their fall protection
safety obligation are wide and varied. Most
importantly, of course, the end-user may be
impacted. But so may companies’ reputations
and bottom lines. If a work at height operative
were to fall using poorly maintained, faulty
equipment, legal proceedings will likely be
brought, fines issued and the HSE would open an
investigation into the company and its health and
On occasion, operatives have been known to
access roof spaces to carry out work only to
discover that there is no height safety system in
place. At which point – as is absolutely their right
– they may refuse to carry out the work. This can
prove costly and delay work that may have been
urgent. Installing fall protection equipment
retrospectively also tends to be more expensive
than simply incorporating it into the building’s
initial design. It’s worth
remembering that – more often
than not – at some point in
the future, someone is likely
to need to gain access to the
roof space or within an area
where eliminating, reducing or
controlling risks associated with
working at height is paramount. It
just isn’t worth avoiding or delaying the
installation of fall protection equipment.
First and foremost, companies must fully
understand what fall protection equipment is,
what it does and what their height safety
requirements are. If for any reason you feel that
your knowledge around height safety is limited,
then consult specialists.
Secondly, companies need to implement a robust
height safety process and ensure that they
adhere to all legal requirements, including the
annual inspection and certification of fall
protection equipment. If you rent a building
space, then you need to understand your
responsibilities and make sure that you’re
minimising risk and fulfilling your safety
obligation. And, most importantly, remember that
behind all the equipment and safety processes is
the end-user. Companies must acknowledge that
it’s a human life at risk if they fail to implement a
robust fall protection regime and properly look
after their equipment.
Contact HCL Safety
0845 600 0086
36 TC MAY 2019
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WHAT YOU NEED TO CHECK
Nick Boulton, Chief Executive of the Trussed Rafter Association (TRA), talks through the
Trussed Rafter safety checks that can give contractors extra protection.
Perhaps you don’t need telling, yet again, about the dangers of working at height. The roofing industry
is rightly obsessed with safety, and works with many other parts of the construction supply chain to
share knowledge and advice on best practice.
This is also what drives the Trussed Rafter Association (TRA). By working with a range of partners, including
the Home Builders Federation and the HSE, we can ensure that the construction sector has access to the
latest information. While TRA members design, manufacture and deliver, most trussed rafter roofs are
installed by sub-contractors. But as a contractor, how can you know it is safe to proceed to the next stage?
Images courtesy of Pasquill, roof trusses in place.
To help in this situation, TRA members can supply a helpful checklist as a key part of the safety guidance
Below: On-site installation.
we provide to housebuilders. This allows you to ensure that the right protections are in place before
starting work on the next phase of the roof package. As trussed rafters are load-bearing and an integral part of the overall roof structure, making sure they are
safe is essential before proceeding. There are several elements that the TRA advises contractors to check:
1The trussed rafters themselves The first
step is to check the layout drawings
provided by the trussed rafter
manufacturer to ensure that the correct quantity
of trussed rafters have been installed, and that
they are in the right positions and orientation. It is
worth double checking that the centres are not
greater than specified and every truss is vertical.
You also need to make sure that no unauthorised
modifications have been made or accidental
damage has happened, as both could lead to
weak points and potential failure of a truss.
In areas of high stress multiple trusses are used
together to form a girder truss, where these are
joined on site (rather than in the factory) it is
essential the fixing schedule provided by the truss
manufacturer is followed exactly in terms of the
number and type of fixings used.
2Bracing timbers Permanent bracing is
essential to hold trusses upright and
prevent buckling. The truss manufacturer
will always provide a suggested bracing plan, but
this needs to be approved by the Building
Designer as responsibility for roof stability
ultimately rests with them. The bracing also
needs to be checked to ensure it is the correct
size, usually 25 x 100 sawn and fully fixed to
each truss, most often now with 2
x 3.1mm x 90mm machine
nails. Where used, valley sets
need to be braced as specified
and fully supported on
3Loose timbers Contractors
need to be sure all loose timbers
used are the correct size and grade and
located in the right positions, and centres are not
greater than specified. All connections such as
birdsmouth joints or scarfs should be accurately
and correctly made.
4Structural metalwork All the structural
metalwork should be double-checked as it
is essential to the structural integrity of the
roof. Truss clips, framing anchors and other
vertical restraints should be present and fully
nailed. Gable restraint straps should also be
correctly fixed. Where used, trussed rafters need
to be properly seated into hangers which conform
to the specification provided and are fully fixed as
5Additional elements There are other
elements that are worthy of a safety check.
For example, the formation of openings for
need to be
sure all loose
are the correct
size and grade
and located in the
right positions, and
centres are not greater
the trap hatch or other purposes, and that
sarking where used is exactly as specified. It is
also essential that the roof tiles to be used are
the correct weight as specified by the designer.
Should any issues with the trusses, loose timbers
or structural metalwork come to light during the
checks, they must be addressed and rectified
before work commences.
Contact the Trussed Rafter Association
020 3205 0032
38 TC MAY 2019
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Liquid Roofing & Waterproofing
THE REINFORCEMENT LAYER DEBATE
Sarah Spink, CEO of the Liquid Roofing and Waterproofing Association (LRWA), outlines the
advantages of choosing reinforced liquid waterproofing systems, as well as what contractors
should look out for...
There are so many liquid waterproofing
systems to choose from, it can often be
difficult to know which is the right solution
for your job. At the LRWA, we have seen firsthand
how projects have failed because the wrong
product was installed. In this article, we will look
at why reinforced liquid roofing systems are often
the better choice in certain environments.
Why use a reinforced system?
Over the years, the LRWA has seen some liquid
roofing manufacturers introduce systems without
a reinforcement layer – claiming to be more cost
effective and quicker to install. Reinforcement
layers are often made up typically of either a
polyester fleece material or a glass fibre mat.
Cold-applied liquids are predominately used in
refurbishment projects which are often installed
over the top of existing roofing systems. Because
of this, there is potential for more thermal
movement, putting the waterproofing system
under stress if reinforcement is not used.
Therefore, most liquid systems require full
reinforcement in refurbishment projects to offer
increased strength and durability.
Reinforcement also provides crack bridging
capabilities, particularly if a crack on the roof or
balcony substrate forms after the liquid
application. To bridge any cracks which may
develop, the overall strength of a full reinforced
system will be significantly higher than the
strength of the liquid resin alone. This means, if a
crack does form, a reinforced system will offer
more flexibility on either side of the crack, which
will lessen the stress on the roof as a whole.
However, if an unreinforced system is used, this
process would create more stress than
elongation, ultimately compromising the lifespan
of the system and potentially
causing it to fail. This can even
happen if a crack wasn’t present
at the time the system was
installed, as no resin coating alone
has infinite elongation capabilities.
Contractors should also be aware that some liquid
waterproofing systems sold without a reinforcement
layer often advise including reinforcing strips over
cracks, joints or points of stress to improve
performance in these critical areas, adding more
cost to a project without providing a full, seamless
reinforced system. It is therefore still advisable to
specify a fully reinforced system as the overall
performance of the solution is then consistent
throughout the entire project.
Reinforcement also ensures consistent thickness
of the waterproofing membrane. Having a liquidapplied
top coat with good adhesion to the base
layer and correct film thickness is really
important. In exposed applications, this layer
endures any potential foot traffic on the surface,
and has to withstand the weather conditions in
our varying UK climate.
There is an argument to suggest that in some
circumstances, reinforcement is not required.
Some non-reinforced liquid systems are often
used in new-build applications where structural
waterproofing is applied direct to concrete or for
coating metal profiled or asbestos cement sheets
The LRWA says there are many advantages to choosing
reinforced liquid waterproofing systems and contractors
need to be aware of these.
Contact the LRWA
0333 987 4581
Left: Sarah Spink, CEO of the LRWA.
for example. In these cases, it is
always best to refer to a
manufacturer’s guidelines on what
substrate a partially or non-reinforced
system has been tested on.
Quality is key
Contractors should be aware of the quality of the
liquid product before they buy. Liquid
manufacturers should have a third-party
accredited quality management system such as
ISO 9001, which ensures the product is
manufactured to a consistent specification.
It is also essential for contractors to undergo
training of that particular liquid system, as every
product is different and may require alternative
installation techniques. Application guidelines
must be readily available from the manufacturer
as well as clear routes for system training for the
contractor. The LRWA also offers accredited
courses which are led by a specialist team.
Raising standards of liquids
The LRWA is committed to working with
merchants to help raise standards across the
industry, and we are currently working on a
project which could provide merchants and other
distributors with a tool enabling them to quickly
and easily assess the suitability of liquid
systems, including accreditations. New initiatives
like this, combined with more awareness and
training, will ensure that merchants, contractors
and manufacturers can provide and install liquid
waterproofing solutions which perform as expected.
40 TC MAY 2019
the A Proctor Group Collection 2019
air permeable vapour permeable roofing underlay
01250 872 261
DON’T BE BUSY EARNING LESS:
PLAN FOR PROFIT ON PROJECTS
As much as we enjoy the day job, roofing contractors like to make a job pay. Profit’s all in
the planning, says Andrew Bright, SIG Design & Technology’s National Business
Development Manager for Liquids...
Making money is about saving money,
making the most of new opportunities,
doing a good job on site – so you don’t
get call backs for the wrong reason – and being
able to relax knowing you’ve done a good job.
While the internet is a wonderful thing, I’ve come
across roofers that say to themselves: “I’ve
downloaded a liquid waterproofing specification
from the manufacturer’s website, so let’s get
started!” This isn’t advisable as one size doesn’t
fit all. So, do the homework on the job yourself or
it can lead to misunderstandings during the
tender stage or practical issues during
board in a warm roof has already
been agreed, has it been tested and
approved by both the board and
Will the building be occupied while
works are in progress e.g. a school
during term time or a hospital
undergoing refurbishment; or again, is
it a new build, greenfield site?
Sometimes, the use of those liquids
with higher VOCs or certain chemical
Andrew Bright, SIG Design &
compositions may not be permitted.
If refurbishment, what state is the
existing substrate in? Some
planned maintenance or overlays
are undertaken as a matter of
course whereas many are a result
of water ingress (often over a
considerable period). This is likely
to mean that the treatment of the
existing surface coverings will be
Below: The curved and vaulted roof to Grade II listed Plymouth Market was refurbished using the Hydrostop AH-25 Liquid
Waterproofing System by DATAC contractor, Clegg & Shortman. At SIG’s request, AH-25’s manufacturers created a special
colour – Weathered Silver – specifically in keeping with English Heritage’s requirements.
“Don’t just rely on
documents on their
You should look to obtain or create a specification
based on project-specific information. While
they’re useful, don’t just rely on suppliers and
manufacturers’ standard specification
documents on their websites, for example J31 for
liquid applied waterproof roof coatings.
The key to any successful project is getting both
specification and product choice right at the
outset. Say it’s a job requiring a liquid system,
start by asking the basics: Is the project a new
build – which may be on a greenfield site – or a
refurbishment? A liquid primer may be required
on certain existing substrates whereas on new
insulation boards it may not. If an insulation
42 TC MAY 2019
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Works could range from some minor basic blister
repairs, caulking of splits or gaps, wholesale
screeding or a full overlay with a recovery board.
There might be major budget implications e.g. the
state of the existing coverings could impact on
both labour and coverage rates of materials. If,
for instance, the existing coverings are dry,
cracked and very absorbate due to UV
degradation, the application of a primer where
one may not be technically required may
dramatically reduce over-spend on a base coat
that would soak into the existing waterproofing,
and always remember to do a bond check first to
ensure materials are compatible.
On a new build, the whole roof design needs to
consider every component in the build-up and
how they interface with the other building
elements. Build into your planning solutions
which will avoid surprises or mistakes later down
the line. On a refurbishment project, a site
inspection is an absolutely essential extra step.
Accredited contractors’ bid support
If you’re bidding for the work, make sure they
know about your firm’s credentials on similar
successful projects. Don’t forget to include details
about the training and monitoring of your
installers and other back-up that your supplier
Members of SIG Design & Technology’s
Accredited contractors scheme (DATAC) receive
extra contract support to help them win work. For
any projects over 500m², SIG D & T will produce a
‘Bid Support Pack’ which they can present to
their client. The pack will contain the
specification required for that project, for
example; NBS specifications, wind up lift
calculations, technical drawings, cut to falls
schemes and a SIG plc backed guarantee
Train to Gain
The myth that; “Some systems are so simple they
don’t need specialised trained operatives” or “It’s
just the same as that other stuff from so and so”,
are just two of the regular excuses used by some
contractors who don’t want to “waste” time or
money by sending their teams on training courses.
Over the years, I’ve seen extremely unsuccessful
installations where the accelerator has either been
omitted completely or mixed at the wrong ratio; or
the reinforcement has been missed out because
the “other system doesn’t need it on bitumen
substrates”. Clients also have a right to expect that
only correctly trained operatives are employed.
We offer product specific training in accordance
with NFRC and SPRA approved criteria. In 2018,
we delivered 85 courses (many for liquids) for 317
candidates at our Shepshed Training Academy and
other UK locations.
Contact SIG Design & Technology
Musgrave Market Place in Dublin is
enjoying a fresh lease of life following
the application of a new roof
waterproofing system from Britannia Advanced
Coating Systems, working with approved
contractor David Jameson Roofing.
The project was undertaken in summer 2018 and
involved the full encapsulation of the Market
Place’s 8000m² corrugated asbestos six-profile
sheet roof. The specified waterproofing system
was Britannia’s Polyshield Liquid Coating.
After a site visit and discussion between all
parties, Britannia’s Roofing Manager Kevin Killen
put forward a proposal of works that was
approved by the client. This was followed by
further discussion leading to agreed timings and
After debris had been removed, a full coating of
Britannia Anti-Fungal Wash was applied to all
Musgrave Market Place before the application.
parts of the roof. The contractors then sprayapplied
a first primer coat of Polyshield to seal
the roof. As specified, a second primer coat was
then applied to provide the Polyshield system
with extra strength.
Working from secure safety platforms, the
roofers’ next job was to roller apply Polyshield
base coat to all vertical and horizontal laps.
These were reinforced with Polyshield polyester
Once the four installation crews had completed
one roof section, the spraying crews then finished
base coating all other parts of the roof on a
conveyor-type basis. This agreed method of
After Britannia’s Polyshield Liquid Coating was applied.
installation reduced standing time and used man
power in the most effective way.
Finally, Polyshield top coat was applied, providing
a seamless, watertight finish to a well planned
and executed project.
“Good weather meant we completed ahead of
schedule, which was great,” said John
Symmington, Jameson Contracts Manager.
David Johnstone, Britannia Managing Director,
concluded it was: “a very successful project
handled well by Britannia’s Kevin Killen and
everybody in the Jameson team.”
44 TC MAY 2019
The choice for decking and paving supports
With the demand for useable rooftop space ever
increasing, Areco is leading the way with its range of
fixed and adjustable supports for paving and decking
applications. We have worked with Hotels, Landscapers,
Roofing Contractors and Builders to provide attractive
and practical solutions.
To complement our range of supports, Areco have
several ranges of Composite and PVCu Decking Systems
available. New ranges of Fireproof Self-Extinguishing
pedestals will soon be available along with Aluminium
Decking Bearers to complete the range.
With a stock of over 20,000 units, we are sure to have
the right support for your project.
Please contact Areco with your enquiry.
• large stock range
• technical knowledge and advice
• nationwide express delivery
• competitive rates
tel: 01922 743553
t: 01922 743553 e: firstname.lastname@example.org
ARECO, Unit 2A Coppice Park, Coppice Lane, Aldridge, Walsall, West Midlands WS9 9AA
FLAT ROOF DRAINAGE DESIGN:
GET IT RIGHT FIRST TIME!
For any flat roof construction, it is important to consider drainage design to avoid costly
damage to the building’s fabric and structure. Brian Bell, Head of Technical Services at
Marley Alutec, discusses what to consider when specifying an efficient drainage system.
Flat roofs are a popular choice for large
buildings such as schools, high rise
residential, hospitals, commercial and
retail units. When compared to a pitched roof, by
far the main advantage of a flat roof is the lower
initial cost of construction, installation and
The design of flat roofs also means that it can
serve a multitude of uses other than protecting
the building’s fabric and contents. They can be
utilised to accommodate terrace areas, living
green roofs, and plant equipment such as air
To ensure the longevity of a building it is
important that the design of a suitable flat roof
rainwater drainage system is carefully considered
and carried out in accordance with BS EN 12056-
3:2000 and the National Annex for the UK. To do
this the following factors need to be taken into
Effective roof area
Firstly, the effective roof area that needs to be
drained must be calculated to ensure water
does not gather on the roof and can be
effectively drained. This is the total square plan
area of the roof, plus any additional likely
rainwater runoff from other roof areas and
Often ignored, vertical surfaces must be
considered in the overall calculation. BS EN
12056 requires that 50% of the vertical
surface, up to a maximum height of 10 metres
from the roof, must be included in the area to
Building design life
While this information is usually specified by the
designer or building owner, it is important to have
an understanding of the design life of the building
to ensure design category calculations are
properly carried out. On average, the typical
design life of a building is 60 years before major
Return period design categories
A return period is the theoretical frequency of
occurrence, in this case the frequency of a storm
event. To identify this period and level of risk, the
roof rainwater drainage design standard (BS
EN12056-3) proposes four design categories,
Category 1: Roofs where ponding can be
tolerated are designed using a one-year return
period. This category is typically used where the
building has no parapet or upstand, as long as
any overflow can fall clear of the building, and the
roof structure can cope with the additional live
loading. Surcharge and overflow flooding will only
occur in very heavy rain.
Category 2: Typically utilised for enclosed /
parapet roofs where ponding depths will become
excessive if the rainwater system fails to cope,
should be designed for an intensity based on the
building life and a 1.5 safety factor. For most
buildings, a 60-year life would be the most
common value chosen in absence of information.
This equates to a return period of 90 years.
Category 3: When a higher degree of security is
desired than that provided by category 2, a return
period of 4.5 x the anticipated building life is
used. For a building with a 60-year life, this
would equate to a return period of 270 years.
Category 4: This category simply refers to
“maximum probable rainfall” with no defined
46 TC MAY 2019
period. It is used when there should be the
highest possible security – for example, at a
nuclear facility. There is a separate rainfall map
for this category.
Categories 3 and 4 often result
in storm return periods
greater than 200 years. It is
worth noting that events that
occur with a frequency of 200
years or more are often considered
catastrophic incidents by insurers.
Therefore, unless there is a justifiable
reason (e.g. the building is of national
strategic importance) it would be impractical to
design a rainwater drainage system with greater
storm return period.
The BS EN12056-3 document provides detailed
information on rainfall intensities throughout the
UK. After choosing a design category and
obtaining a storm return period, the applicable
rainfall intensity figure can be found using the
statistical rainfall data maps provided (Figures
NB.1 to NB.5). Alternatively, if a greater level of
accuracy is desired, rainfall design intensities for
a given return period can be obtained using the
calculation set out in NB.2.2.
Number and positioning of roof
The total rainfall runoff is calculated by
multiplying the effective roof area by the rainfall
intensity. The total rainfall runoff can then be
divided by the performance of an outlet to
determine how many are required. Roof outlets
should be distributed as evenly as possible
across the roof area, to accept an equal
proportion of rainwater runoff.
Emergency overflows should be included within the
design of all flat roofs and balconies with perimeter
upstands greater than 50mm, as these will
indicate if there is a blockage or other maintenance
requirements whilst preventing rainwater from
spilling into the building’s fabric and causing
damage while the blockage is cleared.
look for outlets that
have been rigorously
Flat roof drainage design often requires prior
specialist knowledge, however Marley Alutec has
created a free to use, online Flat Roof Drainage
Calculator to reduce time spent on this
process. Designed with simplicity in mind, the
tool calculates the number of outlets required
based on location and specification, ensuring full
compliance with the rainwater drainage design
standard BS EN12056-3.
There are a number of different types of roof
outlets available, dependent on the type of roof
construction and the waterproofing material being
used. Therefore, it’s crucial to select a
compatible outlet and one that will efficiently
drain the water away.
Outlets need to be compatible with the type of
membrane being used on the roof, otherwise a
watertight seal may not be achieved. With the
wide range of roofing membranes available, such
as bituminous, hot melt, glass reinforced
polyester (GRP), asphalt and cold liquid, it means
that specifying the correct outlet can often be
To combat this, Marley Alutec has created the
Elite range of roof and balcony outlets.
Image shows the Elite range of roof and balcony outlets.
Compatible with all waterproofing
systems, the new range features a
reliable clamping feature that ensures
a water tight seal is easily achieved.
To allow complete peace of mind
when it comes to the performance
of a roof outlet, contractors should
look for outlets that have been
rigorously tested. Typically, within
roof drainage design, the peak
rainwater design depth at an outlet will not
exceed 35mm. To ensure ultimate reliability and
confidence, the Elite range from Marley Alutec
has been rigorously tested to maintain a
watertight seal with water depths surpassing 1m.
Outlets with exceptional drainage performance
figures such as these reduce the number of
outlets required to drain an area, which will of
course reduce overall costs.
The typical recommendation for maintenance on
a flat roof is once every six months, though it is
advised to check more often in the event of
severe weather when leaves may have been
blown over from nearby trees. As such, when
installing the outlets, they should be clearly
identifiable and accessible and the gratings
should not be covered by pavers, plant material
Flat roofs are becoming increasingly popular with
commercial and educational establishments. By
applying correct drainage design and relevant
building regulation, you can ensure your
installation can protect these buildings and
inhabitants from the elements.
Contact Marley Alutec
48 TC MAY 2019
HIGH PERFORMANCE WATERPROOFING
SPEEDING THINGS UP: ROOFING
WHEN TIME IS OF THE ESSENCE
John McMullan, General Manager of Firestone Building Products, discusses the speed of
installation benefits which he says EPDM roofing membranes can offer.
Increasingly tight programmes mean that
pressure is often passed down the
construction delivery chain to avoid any
knock-on effects on the schedule and the risk of
For roofing contractors, the impact of the weather
and the need to get the building watertight makes
the roofing installation amongst the most urgent
and programme-critical elements of the entire
At Firestone, we understand those challenges and
work with contractors to ensure that roofing
membranes can be installed quickly, with
reduced resourcing requirements and labour
costs, without compromising the long-term
performance of the roof by rushing the job.
The benefits of increased width
EPDM single ply membranes allow
a large expanse of roof to be
covered quickly, ensuring the
structure below is protected from
the elements while the installation
is completed. RubberGard EPDM
roofing membrane is provided in larger
widths than either traditional bitumen (which is
typically 1m wide) or other single ply membranes
(which are typically 2m wide). In fact, the
smallest size for RubberGard EPDM is 3m wide x
30m long, and it is usually used in this width for
fully-adhered installations, or as a 6m-wide roll
for mechanically-fixed installations. However, for
larger roofs, it can be supplied in widths as large
as 15 metres to cover huge areas very quickly.
Once unrolled on the roof, the EPDM membrane is
“One of the key advantages of using wider panels
of membrane is the reduction in the number of
seams this provides”
John McMullan, General Manager of
Firestone Building Products.
raised at the edges to allow air
underneath making it
surprisingly easy to manoeuvre
In addition to the speed of roof
coverage, one of the key advantages of using
wider panels of membrane is the reduction in the
number of seams this provides. Even when
considering the difference between the smallest
3m width of EPDM membrane and a traditional
bitumen system, the x3 larger size means at least
a 50% reduction in the number of seams
required. If we then consider the speed and ease
of taping these EPDM seams, with a 30m seam
typically sealed in around 15 minutes, it is easy
to see how the time savings quickly add up as
compared to other single ply systems.
Taping EPDM membrane seams is a fast and
reliable roofer-friendly solution. The installation
technique means that a consistent seam
installation quality can be maintained without
dependency on electrical cables or proximity to
Seam & detailing integrity
As the joints and detailing of any roofing system
are its most vulnerable points, it’s not only
important that these can be installed quickly, but
also that the speed of installation is matched
membrane seams is a
fast and reliable
50 TC MAY 2019
CEMENT ENT SLATES
The charm of a natural slate roof with all the economical,
functional and environmentally frie endly attributes
of modern slate
by long-term watertight performance. Like any
single ply system, an EPDM
membrane must be laid with
laps in line with the
guidelines, but the
use of a selfadhesive
margin for error by
providing exactly the
correct width and
thickness of adhesive
sealant. Consequently, the
consistency achieved with QuickSeam Splice
Tape, which forms part of the Firestone
RubberGard EPDM system, requires only a
visual check to monitor integrity throughout the
working day, underpinning both speed and
Similarly, detailing can be a time-consuming
element for some roofing systems, particularly
where irregular or awkward details are involved.
Conversely, QuickSeam FormFlash,
an uncured EPDM strip that
has been factorylaminated
and the suite of
accessories that has
evolved from this technology
significantly improves quality and
productivity on the roof.
Fix or stick?
Decisions about whether to adhere or
mechanically fix the membrane are usually taken
as part of the technical specification, considering
elements such as the type of structure, its
capability for anchoring and wind load pressures.
“Detailing can be a
element for some
irregular or awkward
details are involved”
Fully-adhered EPDM membranes of 3-5m wide
are already quick to install compared to other
membrane types but, for best speed of
installation, mechanical attachment of the EPDM
membrane can be the fastest route to getting the
building watertight, especially on large roofs with
relatively few penetrations, because the largest
membrane panel sizes may be utilised to fullest
Contact Firestone Building Products
52 TC MAY 2019
WHEN I’M FACING MY
DAILY BATTLES, WHAT
MATTERS IS WHO’S WITH
ME IN THE TRENCHES.
With products designed to get you on and off the roof faster,
dedicated support, and tailored warranties, we do whatever it
takes to help you succeed. Because every step of the way, and in
every sense of the word, we’ve got you covered.
Learn more at www.firestonebpe.co.uk
© 2019 Firestone Building Products EMEA. All rights reserved
Safety at Height
MAXIMISING THE BENEFITS OF
SAFETY AT HEIGHT INSTALLATIONS
Simon Mealor, from working at height experts Altus Safety, discusses the benefits of building
safety at height installations into roofing projects.
Whether you’re working for a main
contractor or direct for the end user, the
chances are that, as a roofing
contractor, any edge protection or safety at height
installation required for the project may be
included in your package of works.
In our experience, however, some roofing
contractors are reluctant to take this element of
the project on. This may be because it doesn’t fall
within your team’s core skills, or because it keeps
you on site for longer, or even because you’re
nervous about the due diligence involved in
getting the specification and installation right.
If any of those reasons are holding you back from
accepting safety equipment installation work,
there are two important considerations you
should bear in mind:
• You can subcontract the specification and
installation to an expert specialist like Altus
Safety with complete confidence that the due
diligence will be taken care of and your own team
can focus on completing the job or moving on to
the next, while our team carries out the work.
• You can take advantage of the opportunity to
build additional margin into the project from the
safety installation, or even up-sell the client to a
more expensive system.
If you work with a safety at height specialist like
Altus Safety, you simply need to provide a brief on
the client’s requirements and the layout of the
roof and we will advise you on the options, put
together a full specification and cost it all out for
you. For refurbishment projects, we’ll even visit
site to complete a survey.
However, it is useful to
understand the types of systems
available and where they fit with
the safety at height hierarchy. If a
collective measure is viable we
would always recommend this,
specifying a guardrail that fits the
parameters of the brief. We
reserve fall restraint systems for
buildings that will only require
occasional maintenance and fall
arrest systems for buildings
where no other option is possible.
Our approach is always to ensure we understand
the actual need rather than simply answering the
client brief. In this way, we can be confident that the
system installed answers the requirements of the
building and the maintenance teams who will rely
on the right level of safety being in place. Often, this
may be your own team returning to the building
for routine roof inspections, gutter clearing or
rooflight cleaning. We look at how many people
will need to access the roof at any one time, how
often and with what level of safety training.
The most likely approach to permanent safety at
height solutions is the installation of a guardrail,
and Altus Safety provides a complete guardrail
design and installation service, assessing the
site-specific loading and structural parameters to
ensure the guardrail is fit for purpose and meets
the specific requirements of the building and the
needs of the personnel who will access the roof.
Freestanding guardrails have become a popular
solution as these are weighted and don’t need to
be fixed to the roof. This not only makes them
faster and easier to install, it also means that the
Above: Atlus Safety provides roof
warranty for the roofing system
will not be compromised and
there are no penetrations to
increase the roof’s vulnerability to
leaks. The absence of fixings also
ensures that the guardrail
requires no detailing, reducing site
time for the roofing contractor.
Where a freestanding guardrail is
not viable, either due to aesthetic
stipulations or space restrictions,
there are a number of alternative guardrail
options. A collapsible guardrail is a popular
choice for buildings where the architect or end
user wants to limit the visual impact of the safety
protection as this can be collapsed and out of
sight when not in use. A powder-coated guardrail,
which effectively camouflages the edge protection
against the roof surface, is another option for a
more subtle approach.
Where space is limited, a fixed guardrail may be
necessary, and on very congested roofs, a parapet
or clamped system offers a robust solution
without encroaching on the actual roof area.
Additional guardrail protection may also be
needed for roof features such as skylights, atria
and lightwells, as the danger of falling through a
glazed feature is just as significant as that of
falling from the edge of the roof. Here, modular
guardrails can be used to create skylight
protection units, creating a barrier to prevent falls.
Contact Atlus Safety
0330 113 0870
54 TC MAY 2019
...and it’s the same for your house!
Cavity Ventilation now available,
manufactured in Britain by
Weep & Peep Vents • Telescopic Underfloor Vents • Brick Vents
Vertical Extension Sleeves • Cavity Sleeves • Plus a huge range of associated products
Ask for the Easy-trim range by name at your local Trade Counter
t 0845 034 6008 f 0845 034 6010
12B Metcalf Drive, Altham Industrial Estate, Altham,
Lancashire, BB5 5TU, Great Britain
For further info on all these roofing updates and more, visit www.total-contractor.co.uk
COROVERGE FITS THE BILL
Installers can edge ahead of the competition with the new Coroverge Universal Dry Verge system, the reengineered
dry fix roofing solution from Ariel Plastics that is fast, easy-to-fit and fully compatible with an
expansive range of roof tiles.
An installation video of the Coroverge Universal
The Coroverge Universal Dry Verge system is a 100% mortar-free, dry fix solution, offering a hard-wearing, durable Dry Verge System is available to watch on Ariel
and attractive finish to the roofline without the inconvenience of using mortar bedding. The Coroverge Universal Dry Plastics’ Youtube channel.
Verge system protects the roof verge from wind uplift, pest infestation and weather degradation. Available in Brown, Anthracite Grey and Terracotta, this allweather
system includes Starter Piece, Verge Section, Batten Clip, and, Angled and Half-Round Ridge Caps options to suit the ridge style. Fully adjustable for
installation with tiles of between 260mm-350mm gauges, the Coroverge Universal Dry Verge system is quick and easy to install, and offers a wealth of
features to make life easier for the installer, giving a more superior dry verge solution for both new build and renovation projects.
The temporary ‘True-Line’ guide in the Starter Piece ensures it is correctly lined up with the tiles, guaranteeing perfect alignment on the roof, whilst a handy
cut out area provides the flexibility to work around existing gutters. www.arielplastics.com
THE DAWN OF A NEW ERA
Cromar has unveiled its new, biggest ever catalogue.
Cromar has launched its biggest and most comprehensive
catalogue which showcases its complete range of products.
The new catalogue, launched at the beginning of April combines the complete Cromar Roofing range
with the new AlphaChem Builders’ range to create the company’s biggest and best catalogue yet. It
is filled with key information on all the company’s products and eye-catching adverts, all delivered
with a fresh and clean design celebrating a brand new era for the company. The catalogue has
already been well received by customers and is not only available on request, but also available on
the company website to download: www.cromar.uk.com
MAXIMA BENEFIT, MINIMUM EFFORT
Marley has extended its range of Maxima clay interlocking tiles with the introduction of a new
Matt Black colour.
Above: Marley’s new Matt Black Maxima clay
interlocking tile. “The Maxima Matt Black offers a classic
profile together with a modern matt black finish which
can be used on a wide variety of roofing vernaculars”
The new Maxima Matt Black tiles offer a modern roofing solution, while also reducing installation time
due to their high coverage rate. The Maxima range features an open gauge and interlock so no specialist
skills are required as installation is the same as installing any concrete interlocking tile. Furthermore,
with a minimum pitch of 17.5º, the Maxima is the ideal solution for a wide variety of building projects,
including one storey extensions where low pitch can be a challenge. www.marley.co.uk/maxima
SITE BENEFITS FOR ROOFERS
CUPA PIZARRAS has launched a new, user-friendly website featuring an installer specific
platform to provide a more tailored experience that suits visitors’ needs and requirements.
Julian Gomez, Director of Marketing at Cupa Pizarras: “Our
hope is that the new website will provide a more relevant
space for installers to browse the CUPA PIZARRAS product
offering and easily locate the relevant information they
The new design has been structured to include more in-depth product information as well as a number of
new features and tools to ease specification. Roofers visiting the website will now find a ‘Professional’
specific page for their use, which includes case study examples, product and installation videos as well
as an FAQs section. From the Resource Centre, roofers will also be able to access information including
product brochures, datasheets and performance certifications. www.cupapizarras.com/uk/
56 TC MAY 2019
Trust Ubbink for quality roofing products to make your life easier
Call us on 01604 433000 or
visit our website for more details.
• VENTS • TERMINALS • NON-LEAD FLASHING • ROOFLINE PRODUCTS • & MORE
For further info on all these roofing updates and more, visit www.total-contractor.co.uk
FLAT & PITCHED SOLUTIONS
Sympathetic locally-sourced materials, technical expertise and market-leading guarantees led Vale of
Glamorgan Council to choose BMI Redland and BMI Icopal materials when re-roofing a primary school.
“We chose BMI because it could offer us 15-year guarantees on the products; the roof slate was made from locallysourced
materials and because the pitched and flat products could work in conjunction on the details,” said Paul Cogan Primary School: For the pitched roof BMI
Hynam, Consultant Building Surveyor to the project.
Redland Cambrian Slate was used, a dry-fix
system to cut down maintenance, and fixings
on the ridge and hip system to mimic the
Built in 1905, Cogan Primary School suffered from a roof that continually leaked despite being patched with various previous roof. BMI Icopal’s Firesmart SBS
types of slate over the years. The roof’s deterioration was accelerated by thieves stripping lead flashings and it had modified reinforced bitumen membrane was
used for the flat roof.
the complexity of there being a 100m² flat roof right in the centre of the school. “The interface between pitched and
flat roof can sometimes cause an issue, so it was a concern. If you have two companies responsible for each, then one can blame the other for any faults,”
Paul explained. “We’d worked with BMI before using its SpecMaster service for pitched roofs and knew that it would oversee the job closely. However, as BMI
supply both pitched and flat roofing solutions, we also knew that we could rely on them for all parts of the roof and they would make sure that the detailing
between the two roofing systems was sufficiently robust.” www.bmigroup.com/uk
LUXLITE’S CONSERVATION BENEFITS
Roof Maker has launched its new rooflight, the Conservation Luxlite.
The Conservation Luxlite offers outstanding U-values as
low as 0.5W/m²K by featuring triple glazing as standard.
This significantly improves the overall energy efficiency and
thermal comfort of the living space.
The conservation area-friendly rooflight has been designed to help architects and installers maintain
the heritage character of their clients’ homes. Designed to replicate the original Victorian cast iron
skylight, Roof Maker’s latest rooflight features a slim shaped split bar that is constructed of high quality
aluminium for better weathering and aesthetics. Roof Maker’s split is structurally bonded to the glass to
eliminate the presence of a cold bridge, significantly minimising the risk of condensation forming and
retaining the best possible thermal performance. http://info.roof-maker.co.uk/conservation
ALL THE SUPPORT YOU NEED
Rainclear Systems can help with selecting, costing and buying your rainwater system.
Rainclear Systems has installation guides and videos
available if you are installing yourself, or they can put you in
touch with an experienced local installer.
They offer a free ‘Take-off’ from architect’s drawings to ensure you have a list of all the
components you need, and using a rainwater flowrate calculator, they will work out what size
guttering & downpipes will be required on your project in your particular geographic location.
Then they can let you know the cost of buying all the components from them. If you need a
special colour or a bespoke item fabricated for your project, they can help with that.
NEW AREA TECHNICAL MANAGER
Donna Owen is Sika-Trocal’s new Area Technical Manager for the Midlands region.
Donna Owen is Sika Trocal’s
new Area Technical Manager for
the Midlands region.
Donna, who will be working with Area Technical Managers and the applications team, said: “This is
an extremely exciting opportunity for me. Sika-Trocal is a leading light in the roofing industry and
renowned as an innovator of high-quality solutions. I hope my experience will prove beneficial and
further the company’s superb service offering.”
Donna commenced her appointment with Sika-Trocal in February. www.sika.co.uk
58 TC MAY 2019
SLATE FOR ROOFING
Comprehensive product range
30 to 75 year market-leading warranties available
Reproduction & Fibre Cement ranges
Tailored ranges in stock in your area
Full support & guidance
Natural Slate Ranges
“THERE ARE SAVINGS TO BE MADE
BY ENGAGING OFF-SITE SPECIALISTS”
Architectural panels specialist Vivalda Group has seen a growth of around 70% in its off-site
fabrication services in the last two years – a definite sign that contractors and installers have
less time and less space on building sites. Peter Johnson, Vivalda Chairman, explains why
more contractors are now moving processes such as machining, cutting, drilling and preassembly
off-site, leaving the dirty work to companies like his…
We have seen definite shift in attitude
from contractors over the last few years
aimed at reducing waste and increasing
accuracy. When times are good, wasted offcuts
and the odd mistake in cutting size can be
overlooked. However, as profit margins have
reduced, diligent contractors have taken a fresh look
at their supply chains and realised that there are
savings to be made by engaging off-site specialists.
Mistakes reduced, efficiencies increased
While this approach reduces costly mistakes, it also
creates much greater efficiency in the supply chain,
significantly reducing the time it takes to install
cladding board. Traditionally, the contractor would
take boards from pallets delivered to site and
then cut them to size, adding brackets, screws
and fixings as required. Taking the task off-site
means that the process is done by a focused
team of technicians, in a conducive environment
and then quality checked before
This off-site approach also
supports main contractors in their
need to reduce the footprint of
construction sites. This requirement
is especially evident in urban and
inner-city sites, where space is at a premium
and the availability of land to store bricks, cladding
and other materials is simply not there.
Health and safety
Finally, health and safety provides another strong
argument in favour of adopting off-site
fabrication. On-site dust has always been an
issue, given the fact that even now more than
500 construction workers a year die from inhaling
silica dust. We’ve all seen site workers cutting
stone, plastic and plasterboard on site – without
Left: Peter Johnson, Chairman of Vivalda.
a properly fitting mask. And this is
an area that the HSE is really
clamping down on.
While there are plenty of steps
contractors can take on-site to
reduce risks in this area, we’re seeing
more site managers export this problem to
us. At all of our UK production facilities, we’ve
invested in modern cutting technology, all of which
is linked to extraction pumps that deal with the
dust. We also use the latest CNC programmes to
ensure absolute accuracy when cutting and drilling
Growth in modular housing
This emerging off-site trend is also being fuelled by
the growth in modular housing which is being driven
by businesses such as L&G, Pocket Living and
Caledonian. We all know that the UK is suffering
from a chronic lack of housing and off-site
manufacturing is widely considered to be the best
way of delivering this important national project.
Installers need to be aware of these trends, as
they will begin to affect the way that panels are
delivered to site before being erected. We think
this will be good news for installers as it will
improve their efficiency levels while reducing
costly mistakes during the pre-fixing stage.
Contact Vivalda Group
0121 328 9381
60 TC MAY 2019
For further info on all these cladding updates and more, visit www.total-contractor.co.uk
ANSWERING THE RIGHT QUESTIONS
Following customer feedback and online requests, Freefoam Building Products is pleased to announce the launch
of a brand new online feature – Technical Frequently Asked Questions.
Louise Sanderson, Freefoam UK Marketing Manager, explained: “As our product range has increased and diversified we’ve
seen a significant rise in enquires regarding product information. Customers selling and using our products are
professionals who want to get it right. Freefoam products have been designed to be used in a wide variety of situations and
projects and we want to ensure that installers have the right information to get the job done correctly and professionally.”
Freefoam answers questions and
provides information on its product
range with its new facility.
The database covers a wide range of technical questions that customers and fitters have asked and find most useful. Quick and easy to access from a pop up
box on every web page, the tool allows site visitors to view a wide range of topics and issues covering the full Freefoam product range. From general fitting
instructions and product information, to more specific fitting tips and examples of individual fitting situations the database allows users to filter by product
range or simply type in their question. Accessible from PC, mobile and tablet, the tool is instantly available to customers and fitters out on the job.
CEMBRIT’S STADIUM PERFORMANCE
Cembrit HD (heavy duty) board has been installed in the redeveloped East Stand at
Twickenham, the home of England Rugby.
Cembrit HD has been installed at Twickenham Stadium.
Resilient, hard wearing and with an impressive fire rating, HD is an ideal multi-use board for high
traffic areas in sports stadia such as Twickenham. Supplied by the Hayes branch of Minster, the
Cembrit HD board is installed in the Rose Garden itself, in the wings of the facility, as well as on the
walls of the adjacent L5 concourse where impact resistance was important as crowds are moving in
confined spaces. www.cembrit.co.uk
FREEFOAM SPRINGS INTO ACTION
Freefoam has launched the Spring edition of its Product Catalogue.
Freefoam has launched its
Spring Product Catalogue
With an updated look and new products , the guide provides customers and users with the complete
guide to the full range of Freefoam products including PVC-U and PVC-UE fascia, soffit, rainwater
systems, exterior cladding, interior panelling and flooring. With over 2,000 product items, a clear and
concise catalogue is essential for Freefoam stockists to promote the range. This A5 compact format
is ideal for building professionals, roofline fitters and roofers to keep a copy handy whilst on the go,
with all the product information they need. www.freefoam.com
STOVENTEC’S A GLASS ACT
The StoVentec Glass Rainscreen System supplied by Sto UK was chosen for a museum
collections centre extension project in Edinburgh, thanks to its outstanding aesthetic
properties and its durable nature.
A StoVentec Glass Rainscreen System was chosen for
this extension to the National Museums Collection
Centre in Edinburgh.
The black infused colour StoVentec Glass was installed on the new extension to the National Museums
Collection Centre in Granton, Edinburgh. “We were looking for a rainscreen cladding system that would
help harmonize the new extension with the existing building, and the StoVentec Glass system offered
the perfect solution”, explained Francesco Di Domenico of Hypostyle Architects. www.sto.co.uk
62 TC MAY 2019
A NEW COMPOSITE
YOUR BOTTOM LINE
LIGHTWEIGHT COMPOSITE CLADDING
BBA CERTIFIED SYSTEM
INDEPENDENTLY FIRE TESTED (UK 2018) TO BS EN 13501-1
PATENT PENDING COMPOSITE MATERIAL
Find out more about the new coastline ® lightweight
composite cladding range. Call us on:
0800 988 7318
or visit: eurocell.co.uk/coastline
For further info on all these cladding updates and more, visit www.total-contractor.co.uk
OFF-SITE WALL SOLUTION
Kingspan TEK Cladding Panels have provided an off-site wall solution for a unique school and leisure campus in
Littleport, helping the project to achieve excellent thermal performance within a tight construction deadline.
The £37.5 million development, designed by SNC-Lavalin’s Atkins business, co-locates a pre-school, Littleport and East
Cambridgeshire Academy (LECA), Highfield Littleport Academy Special Education Needs (SEN) school and a public
leisure centre. It has helped to create an inclusive community where children of all ages and abilities can develop together. To ensure the ambitious plan would
be delivered in time for the new school year without compromising on the facilities’ energy performance, 142 mm-thick Kingspan TEK Cladding Panels were
specified for many of the external walls. Kingspan TEK Structural Insulated Panels (SIPs) were designed and factory cut to the project’s unique specifications
by Kingspan Timber Solutions. This offsite production process minimised site waste and enabled the panels to be quickly installed onto the steel frame, ready
for main contractors, Morgan Sindall Construction, to apply the final external finishes,
The highly-insulated core of the Kingspan TEK Cladding Panels allowed the project to meet its thermal performance targets. Meanwhile, the OSB/3 facing and
unique jointing system minimised air-leakage through the building envelope, helping the scheme achieve a BREEAM ‘Very Good’ rating.
MAGPLY HAS IT COVERED
A residential project in Essex is making use of Magply boards for both the internal lining
and exterior cladding treatment to an innovative lightweight steel framing system,
demonstrating the widely specified fire resistant product’s multiple attributes.
The four bedroom new-build and extensions to a neighbouring existing property are being
carried out by SP&J Construction, in a joint venture with Uni-Frame and the ARG Group. The
intention is to use the current project as a show-site for the rapid build MMC solution and the
wide choice of finishes which will be available to future purchasers. www.magply.co.uk
RCM ADDS MEG TO ITS OFFERING
RCM, the complete through wall solutions supplier, is delighted to announce the
addition of Abet Laminati MEG HPL façade to its already impressive portfolio.
Robust, compact and long-lasting, MEG – Material Exterior Grade building façade by Abet
Laminati is specifically designed for outdoor applications. This versatile and durable range is
made up of a rigid core combined with a decorative surface consisting of weather-resistant
thermosetting resins. The high pressure laminate (HPL) is often used as rainscreen cladding,
as well as on balconies. www.buildingboards.co.uk
ROUGH OPTION SHOWS ITS CLASS
Cembrit has launched Patina Rough, a new through-coloured cladding board which has a
sandblasted surface which gives the board an attractive, stone-effect finish.
Cembrit Patina is a genuinely through-coloured, fibre
cement decorative rainscreen cladding and is available
in two popular and attractive shades, Flint and Sand.
Patina Rough complements the original Patina, with its directional grain surface, to offer a desirable
choice of premium cladding for a wide variety of external applications. Patina Rough has a surface
that achieves a natural, cast, or engineered stone cladding-type finish, but at the reduced price and
structural cost that is in line with lightweight rainscreen cladding,” explained Ged Ferris, Marketing
Manager at Cembrit. www.cembrit.com
64 TC MAY 2019
HIGH PERFORMANCE LIQUID
BENEFITS & PRODUCT
BBA certified for life in excess of 25 years.
NHBC and Green Roof Approval.
ULTRAFLEX can be used on new or existing
roofs, walkways, balconies, gutters etc.
Ready to use straight out of the tin, application
with solvent resistant roller.
Use fully reinforced with ULTRAFLEX matting
ensures easy ‘wet on wet’ application.
Can be used all year round – moisture curing.
Fully trafficable when cured.
Instantly rain resistant after application.
Once installed, forms a seamless membrane.
Exellent adhesion to different substrates: plywood,
bitumen membranes, asphalt, metals,
brick, concrete, wood etc.
Fresh concrete must be cured for 28 days.
On EPDM and TPO it is recommended to install
patch test to check compatibility.
Do not use silicone sealants. Always use PU
The Building Envelope
ADDRESSING MOISTURE MOVEMENT
The experts at A Proctor Group talk through the considerations
that should be made when it comes to moisture movement.
Heat, air and moisture movement (HAMM)
through the building envelope is a
naturally occurring process that affects
the integrity of building components and the
health of building occupants. As an
understanding of HAMM grows in the industry,
designing for moisture management in all areas
of the building envelope has quickly become
Construction professionals in the UK consider BS
5250:2011 ‘Code of Practice for control of
condensation in buildings’ the authoritative
resource on this topic. As a starting point, the
Standard specifies the industry must be aware of
both the internal and external factors contributing
to condensation control and building health,
where it states:
“In order to avoid the occurrence of excess
condensation, which can result in mould growth
and damage to the building fabric, designers
should assess the amount of water vapour likely
to be generated within the building … and
consider the effects of the external climate.”
This statement seems perfectly reasonable in
theory, but how in practice can a designer deal
with internal humidity levels that can change with
building function, use and occupancy
adaptations, as well as external conditions like
weather and topography that are clearly beyond
Risk assessment methods
Construction professionals have traditionally
utilised the Glaser method to assess
condensation risk. Glaser is a ‘steady state’
calculator that uses average monthly
temperatures, vapour pressure and heat
conduction to determine if condensation occurs at
critical points over the span of 12 months. While
this method correctly looks at vapour diffusion, or
the passage of water vapour through the building
fabric, it only considers this movement in a single
direction. There are other limitations with the
Glaser method: the calculations do not account
for additional sources of moisture such as damp
soil, seasonal wet and dry cycles, or the porosity
of materials used in the construction. The Glaser
method is suitable for very simple, lightweight
construction types, however, it is broadly
considered to be inappropriate for the vast
majority of projects, particularly any that use
materials with the potential for absorbing water
like porous brick or fibrous insulations, as well
as any retrofitted buildings with solid masonry
WUFI (Wärme Und Feuchte Instationär) software,
developed by the Fraunhofer Institute for Building
Physics in Germany, was a huge step forward for
the industry in terms of condensation risk
assessment. In contrast to the Glaser method,
WUFI calculations are ‘non-steady state’
simulations that constantly plot the movement of
heat, air and moisture in a state of constant
change relative to building usage, project aspect,
and seasonality. WUFI goes much further than
Glaser by including other sources of moisture
such as ingress from the ground, worst-case
scenario precipitation events, and the natural
variation in moisture content within individual
building materials over time. As the designer is
able to simulate an hour-by-hour condensation
risk analysis over an infinite amount of time,
projects can be optimised for longevity and for the
health and wellbeing of occupants.
The profession’s growing understanding of the
complexities of HAMM has led to a shift in the
industry in two ways. First, modeling software
like WUFI is becoming increasingly
Above: WUFI test: Grey – External surface; Blue – Midpoint;
Black – Internal surface; Red – Temperature (Midpoint).
Above Top: A Proctor’s products were used at Canalside
sophisticated to better model and assess the
subtleties of building physics, and second, a
new generation of construction materials are
being developed to work with HAMM thereby
supporting the long-term health and durability
of a building.
One example of these advanced materials are
“intelligent” vapour control layers (VCLs) which
have been designed to adapt to changing
humidity circumstances. These variable
permeability VCLs can change their permeability,
becoming more vapour resistant during winter
and more vapour permeable in the summer.
Variable permeable membranes help to regulate
the natural moisture-loading and drying out
cycle of the building envelope by protecting the
building fabric in the colder, wetter months, and
allowing it to dry out effectively in warmer, drier
Need a WUFI calculation? Contact the A. Proctor
Group’s Technical Department.
Contact A Proctor Group
66 TC MAY 2019
Ultra-high performance encapsulated VIP insulation
for flat roofs and terraces
Say goodbye to build-up constraints when installing effective insulation on
flat roofs and terraces where space is tight and where height constraints
exist. Deck-VQ ® — with its exceptional thermal insulation performance of
0.008 W/mK with a thickness of just 60mm — helps you to achieve even
greater insulation with ease. It’s time to think thin.
For more details, please visit www.recticelinsulation.com
KINGSPAN HOLDS COURT ON RENOVATION
Tower Bridge Magistrates’ Court and Police Station has been reinvented as a four-star boutique hotel in a
Dominvs Group development. It includes the installation of a tapered roof insulation system from Kingspan
Insulation – ensuring the only thing taking the fall from now on at the former court will be the rain.
To raise the thermal performance of the building’s flat roof, whilst also providing effective drainage, Kingspan
Thermataper TT47 LPC/FM and Kingspan Thermaroof TR27 LPC/FM were installed.
Kingspan systems were used on this
Dominvus Group project.
Kingspan Thermataper TT47 LPC/FM provided the project team with a fast-track alternative to other drainage methods, such as structural falls. The product
combines high performance insulation and drainage in a single board which can be fixed with a dry installation process, avoiding the time lost waiting for wet
trades to dry. The lightweight boards can also be as little as 1.5%, or less, of the weight of a screed to fall solution, minimising the structural support
requirements for the roof surface.
Kingspan Insulation’s specialist tapered roofing service team created a carefully tailored scheme layout for the hotel roof, maximising cost efficiency whilst
also ensuring the surface met the rainwater runoff and insulation requirements. The layout also simplified the installation process for the site team aided by
the pre-mitred hip and valley boards supplied as part of the Kingspan Thermataper system. www.kingspaninsulation.co.uk
SLENTEX A2 MAKES ITS MARK
The A. Proctor Group has launched a new vapour permeable insulation, which offers superior
thermal performance and fire protection behind cladding.
With a thermal conductivity of 0.019 W/mK, Spacetherm
Slentex A2’s performance credentials are said to qualify
it as one of the best insulation materials available.
Spacetherm Slentex A2 is the result of extensive research and development to produce a vapour
permeable insulation with an A2 fire rating classification. The new insulation is classified as Class
A2, s1 – d0 according to the Euroclass system, which classifies the reaction to fire performance of
building products. Spacetherm Slentex A2 is available in a range of laminates utilising MgO and
plasterboard as well as in a cold bridging strip format. www.proctorgroup.com
KINGSPAN SHOWS ITS BOTTLE
Kingspan has committed to recycling 500m plastic bottles each year by 2023 for use in its
insulation with a further target of 1bn bottles each year by 2025.
Kingspan has partnered with the EcoAlf Foundation and
under a 3-year partnership, the company will proactively
help to remove up to 150 tonnes of waste from the
Mediterranean each year.
This recycling initiative is part of a broader Kingspan programme, together with the company’s 2020
Net Zero Energy manufacturing target, to produce its energy-saving products in a low carbon and
environmentally responsible way. Kingspan is already manufacturing insulation using recycled
plastic but will be adding recovered ocean plastic to this manufacturing chain, made with raw
materials from its plant near Barcelona, Spain. www.kingspan.com/group/
PHYSICAL & THERMAL BENEFITS
An iconic residential development by Barratt London is includes the use of Marmox Multiboard
for its outstanding physical performance with two walls around the 20 metre swimming pool
being lined with the moisture resistant backing board.
Marmox Multiboard has been used at Landmark Place
which stands alongside the Tower of London.
The ground floor pool and spa used close to 100 of the 2500 x 600mm Multiboards for the work, as well
as six boxes of dowels to secure them and 30 rolls of Marmox Jointing Tape. Marmox Multiboards are
manufactured from XPS and offer a range of positive physical characteristics, including good thermal
insulation, in addition to being fully waterproof. www.marmox.co.uk
68 TC MAY 2019
Simplified Safety Solutions.
The training you need.
The products you want.
The knowledge you trust.
Visit us at
Safety & Health Expo
for a Virtual Reality
COULD YOU SAVE TIME & REDUCE
RISK WITH THE RIGHT SOFTWARE?
By Richard Boston, Marketing Director at Eque2.
Construction management software is
becoming increasingly more important for
contractors. Industry-specific solutions,
such as Eque2’s Construct for Sage software, are
equipped with the tools to manage construction
businesses efficiently and securely in order to
eliminate risk and protect margins.
These programmes remove the need for manual
spreadsheets and store important information all
in one system to help with day-to-day
management, job costing, subcontractor
compliance and client billing. But what are the
wider benefits and what difference can they make
to construction businesses and the industry as a
According to a recent publication from the
McKinsey Global Institute, the implementation of
digital technologies across the construction sector
will generate a 14-15% improvement to the
industry’s productivity. Both large and small
contractors are under a hefty amount of pressure
to meet current housing demands and to build
buildings for the nation’s ever-developing regions.
And although this demand is keeping the industry
occupied, as a whole these unwieldy pressures
are stunting the industry’s overall output.
Taking the McKinsey statistic into consideration, it
is clear that investment in technology would
increase construction projects’ efficiencies,
driving the industry towards the modernisation it
is yearning for.
Moving towards a digital resolution
As a collective, the construction industry should
always be asking itself: what can we do to deliver
projects more efficiently? What the industry truly
needs are solutions which streamline even the
slowest and arduous tasks which businesses
have to complete day-in, day-out.
Whether it is manual invoicing
or general administrative
duties, these tasks have
the potential to save
time and money if the
right platform is
In this case, the right
platform is digital
solutions. A pivotal aspect of
the UK’s current Industrial
Strategy, the digitisation of the construction
industry is already having a transformative
impact on both the quality of construction
projects and the manner in which they are
The immediate benefits of digital technology on
the construction industry are multiple. For
instance, a solution such as our product
Construct for Sage which was created in
partnership with Sage, can revolutionise the way
contractors run their businesses. Providing
different packages dependent on a business’s
size, Construct for Sage is a comprehensive
solution allowing businesses to run their company
with more efficiency.
With this technology, crucially the finance and
commercial teams can share vital project
information across a multitude of tasks without
the need for duplication of effort. These digital
platforms ensure all information is stored
securely and can be accessed easily by those
granted to acquire them, rather than sat in
multiple standalone spreadsheets which are
prone to errors.
Not only can they ensure
with CIS, manage
processes such as
retentions, they can
also see the real-time
performance of a project
and take action early when
a contract is set to go over
budget. This level of visibility into the
true financial performance of projects is crucial to
protecting margins and ensuring contractors keep
on top of their business at all times.
Another huge pressure on the construction
industry is the skills shortage. According to
statistics from the Construction Industry Training
Board (CITB), 168,000 new jobs will be created
over the next five years. Although it is
encouraging to see new work being won, it is still
an immense pressure on an industry that is
already floundering; fuelled by the departure of
EU workers from the UK due to Brexit.
There are, however, examples of some change in
action. For instance, mobile technology has been
developed to connect on-site work with the back
office. This modern method of working is highly
attractive to younger people looking at a career in
Moreover, the City of Glasgow College has
implemented Eque2’s EValuate estimating
software to help students working towards a
career in the construction industry. This
progressive college recognises the need to
continually modernise and adopt new practices to
70 TC MAY 2019
“These digital platforms ensure all
information is stored securely and
can be accessed easily by those
granted to acquire them, rather than
sat in multiple standalone
remain relevant in today’s tough climate.
The technology is fresh, innovative and exciting radically changing the
erroneous perception that construction simply constitutes hammers, ‘wood’
and muddy hi-vis vests. In effect, further integration of software into multiple
institutions will cultivate a substantial workforce equipped with the
knowledge and experience to take the industry into a digital age.
On a broader spectrum, construction management software also minimises
risk which is crucial in the post-Grenfell construction world. A calamity such
as this truly highlighted what needed to change in industry – enhanced
visibility and traceability. With digital solutions, risk can be easily identified
as information can be accessed quickly and efficiently. Risk can be located
throughout a building project’s entire lifecycle, to not only ensure occupant
and building safety, but to preserve the industry’s credibility as a whole.
For an industry that is drastically lagging behind in terms of digital adoption,
straightforward, easy-to-use, innovative digital systems are the catalysts for
change. The benefits of these digital solutions are two-fold; not only do they
help businesses manage their day-to-day operations more efficiently, they
remove risk and save money – two fundamental factors essential to the
construction industry’s preservation and growth. And with digital systems
already showing the fruits of its labour, it is becoming more and more
difficult to identify the reasons why digital systems won’t be the industry’s
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• 2300 W / 50 – 700 °C / 150 – 500 l/min
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• Including fine dust filter
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LIMITS FOR VAN DRIVERS
Tradespeople who use work vans to get to and from jobs could be hit with a fine of up to £300 if they exceed
the UK daily driving hours limit, experts have warned.
LeaseVan.co.uk has highlighted the law which states that drivers operating a van for commercial purposes must Those who use vans to get to and from jobs must
take note of the UK daily driving hours limit.
observe the same working hour restrictions and rest period requirements as professional HGV drivers. Drivers
operating a work van for more than four hours per day are not permitted to be behind the wheel for more than ten hours and aren’t allowed to be on duty for
more than 11 hours on any day in which they drive. Working drivers can only reach the ten-hour limit twice per week. For other days that week, they are then
restricted to nine hours – or 56 hours in a week and 90 hours in any fortnight.
Van drivers on the roads for business purposes must also get at least 11 hours rest daily, take breaks totalling at least 45 minutes after a maximum of four
and a half hours of driving and take an unbroken rest period of 45 hours weekly. Skipping breaks and exceeding these limits could see van drivers hit with a
fine of up to £300. It could also prove dangerous for both the driver and other road users, with tiredness and fatigue among the leading causes of road
accidents and being potentially as deadly as drink or drug driving. The limits are suspended for the duration of emergencies, where the driver needs to take
immediate preventative action to avoid danger to someone or an animal’s life or health, or serious damage to property. www.leasevan.co.uk
SHORT GAME: COOL COMFORT THIS SUMMER
Snickers’ FLEXIWork Stretch Shorts are designed to deliver superior comfort and freedom of movement.
Above: FLEXIWork Stretch
shorts from Snickers.
While fabric, functionality and fit are hallmarks of Snickers Workwear, it’s the innovation and fabric technology in the design of
the new FlexiWork Stretch Shorts for men and women that really set these new garments apart. Delivering superior flexibility
and comfort, these lightweight work shorts come in a hi-tech body-mapping design and are made from a self-ventilating
stretch fabric with Cordura reinforcements for all-round mobility and durability when you need it most. As well as being streetsmart
with men’s and women’s designs, they’re packed with comfort and functionality and specially designed for the fastpaced
professional who’s always on the go and always delivering top class work on site. www.snickersworkwear.co.uk
LIGHT IT UP WITH LUCECO
A new range of site lighting has been created by lighting experts, Luceco.
The range includes a number of tripod work lights and
options for single or twin heads, a plasterer’s work light,
festoon kit, a portable work light and non-corrosives in
both two foot and five foot.
The range of robust, high performing and efficient 110V site lights have been developed based on
feedback from those using similar products across a wide range of environments. The new worklights
further expand Luceco’s arsenal of lighting options, joining an already broad range of lighting
products aimed towards the day-to-day tradesperson. Available since April 2019, the range provides
a variety of site lighting options. All the lights are certified to a minimum IP rating of IP44, however,
the bulk of the fittings are tested to IP65, with the plug being IP44. www.luceco.com/uk
NEW CAT S61: PACKED WITH TOOLS
The successor to the multi award winning Cat S60, the CAT S61 features enhanced FLIR thermal
imaging capability, built-in laser assisted distance measure, and an indoor air quality sensor.
The new Cat S61 is the tool to help get any job done and is available now from www.catphones.com
with an MSRP of £799.
The new Cat S61 is the tool to help get any job done and
is available now from www.catphones.com.
The Cat S61 includes an integrated thermal imaging camera, laser assisted distance measure and
indoor air quality monitor to assist tradespeople with all aspects of their work. www.catphones.com
72 TC MAY 2019
WILL T LEVELS ATTRACT TALENT?
Academic routes are not the only path to success, and with a shortage of new talent
entering the construction industry it is more important than ever to find an alternative way of
learning to bridge the gap. The introduction of T Levels – technical education programmes
for young people aged 16 to 18 – have been billed as the solution. Jackie Biswell from Apex
Roofing gives her view...
The construction industry is facing a
recruitment crisis. During one of the worst
economic downturns in recent memory in
2008, building contracted by 16.5%. Although the
sector recovered and work was plentiful, the
workforce was no longer there to carry it out.
It is not only the recession that has given cause
for concern. There is still uncertainty over Brexit.
Whether we leave or remain, the future for
existing migrant workers in the UK is unknown
and employing overseas workers will no doubt be
a more complicated process.
Another threat to the industry is the prediction
that 400,000 construction workers will retire in
the next decade. And that statistic is not matched
by the numbers of new talent entering the trade;
essentially, the old guard will be leaving and there
will not be enough new workers to fill the void.
The new generation
A report from the Chartered Institute of Building
(CIOB) revealed that the construction industry
needs to find 157,000 new recruits by 2021 to be
able to keep up with the increasing demand.
At a time when major national infrastructure
projects are taking place and there is an evergrowing
demand for skilled workers, it is crucial
that a new generation of construction workers are
recruited to address the skills gap.
Previously, one of the key initiatives from the
industry and government has been apprenticeships.
In April 2017, changes in apprenticeship funding
were introduced meaning the funding of new
apprenticeships now comes from an
apprenticeship levy rather than
The Government’s aim was to boost
productivity by investing in human
capital, developing vocational skills and
increasing both the quality and quantity of
Between August and October 2017, only 114,400
young people began apprenticeships –
substantially less than the 155,300 reported in
the same three months in 2016.
Apprenticeships are often seen as a fall back for
those who cannot or do not want to study for A-
levels or go for university. There needs to be a
greater emphasis placed on vocational learning
and that’s where the T Level comes in.
What is the T Level?
More than £500million a year will be spent on the
new-style technical courses which provide an
alternative route into work.
T Levels will become one of the main choices for
students after GCSEs alongside apprenticeships
for students who want to learn a specific
occupation on the job and A-levels for those who
want to continue with academic education.
The T Level, which will last for two years, will be
the equivalent to three A Levels, include at least
45 days of industry placement and the students
will receive a grade upon completion.
The qualification will be based on the same
occupational standards as apprenticeships which
are designed by employers.
Left: Jackie Biswell, Apex Roofing.
T Level panels, which consist of
employers, professional bodies and
providers, have worked together to
develop the curriculum to ensure the
content meets the needs of the industry and
prepares students for the world of work.
The first of the new T Level courses will start in
September 2020 with construction being one of
the 15 chosen sectors.
It is expected that the construction T Level will be
broken down into sub-categories of skills for jobs
such as bricklayer, carpenter/joiner, construction
supervisor and electrician.
Will it be a success?
The construction industry is crying out for skilled
workers and the T Level has been created with
the intention of garnering a new generation of
young workers with valuable industry skills.
The new qualification has, of course, been
welcomed and criticised by various sectors, but
we think it is a positive step to plug the widening
skills gap by actively supporting those who do not
take the A-level, apprenticeship or university
route into their career.
What are your thoughts on T Levels? Email
Contact Apex Roofing
74 TC MAY 2019
OLD TRAFFORD FC STADIUM
1ST OCTOBER 2019
1ST OCTOBER 2019
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