May 2024

MAY 2024
>>> RETENTIONS UPDATE • VENTILATION FOCUS • WIND LOADINGS ADVICE • PANTILES >>>

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Editor’s Intro
MATT DOWNS
EDITORIAL DIRECTOR
MATTDOWNS@MEDIA-NOW.CO.UK
07963 330774
We were fortunate to attend NFRC’s event at the House of Commons
last year which looked to raise awareness at Government level of the
problems caused by cash retentions for sub-contractors.
Whilst we’d love to says there’s a ‘silver-bullet’ solution to eradicate this
issue, most are realistic enough to accept that unfortunately it will be slow
progress in removing this outdated process. But in his latest column, James
Talman, NFRC CEO, provides an update on the progress being made around
cash retentions. He points out that talks continue at Government-level, with
Minister Kevin Hollinrake MP acknowledging earlier this year that action was
needed in this area, prompting James to state: “we await to see in what form
regulations follow.” Read the full article on page 12.
Cover courtesy of AccuRoof, the new name for SIG Design & Technology.
Find out more at accuroof.co.uk
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Whilst late payments are an immediate and often regular challenge for
business owners, in this issue, Alice Lees, Partner and solicitor specialising
in corporate Law services at Nelsons, tackles the longer-term issue of
succession planning, an area that for many smaller, owner-managed and
family businesses can be pushed down the list of priorities as day-to-day
challenges take precedence. Read Alice’s advice in this area on page 14.
Advertising:
Publishing Director: Andy Dunn
DD: 01892 730890
Mob: 07963 330777
Email: andydunn@media-now.co.uk
Editorial Director Matt Downs
DD: 01892 730890
Mob: 07963 330774
Email: mattdowns@media-now.co.uk
Elsewhere in this issue, Kevin Taylor answers the key questions on installing
clay pantiles, following Marley’s relaunch and expansion of its Lincoln clay
pantile range (p.16); Gavin White of Sika highlights the importance of
traceability and transparency when it comes to product info (p.20); Ardit Strica
of Onduline talks low-pitched roofs and sub-roof systems (p.22); Nick King of
Klober focuses on the importance of ventilation (p.26); plus we talk DensDeck
Roof Boards and more with Pete Hollingworth (p.30;) and Clare Fenton of
MCRMA focuses on windloadings and getting your calculations right (p.36).
So read on for all this and much more...
Matt
The content of Total Contractor magazine (and website) does not necessarily reflect the views of the editor or publishers and are
the views of its contributors and advertisers. The digital edition may include hyperlinks to third-party content, advertising, or
websites, provided for the sake of convenience and interest. The publishers accept no legal responsibility for loss arising from
information in this publication and do not endorse any advertising or products available from external sources. No part of this
publication may be reproduced or stored in a retrieval system without the written consent of the publishers. All rights reserved.
Registered office: 1 Forstal Road, Aylesford, Kent, ME20 7AU
Supported by:
22
Ardit Strica, Technical Manager at
Onduline Building Products, provides a
comprehensive overview of low-pitched roofs,
their challenges, and the transformative benefits of
sub-roof systems. Page 22

Contents
3 KEY FEATURES
30
14 THE SECRET OF
SUCCESSION
Alice Rees of law firm Nelsons discusses the
importance of succession planning for roofing
businesses, highlighting how addressing this
early on can provide a clear pathway for the
next generation and help secure the future of
the business
16 ASK THE EXPERT
Following the recent relaunch and expansion
of Marley’s Lincoln clay pantile range, Kevin
Taylor answers some of the most common
pantile installation queries
36 CORRECT CALCULATIONS
Clare Fenton, Chair of MCRMA, highlights the key
considerations and support available when it
comes to wind loadings on projects
42
FURTHER READING
18 APPRENTICE APPRECIATION
Fraser Biles of BMI UK & Ireland shares his advice on
maximising the potential of apprenticeships
20 THE WHY IN CCPI
Gavin White of Sika explains why transparency and
traceability are key for construction product information
22 THE LOWDOWN ON SUB ROOFS
Ardit Strica of Onduline Building Products provides an
overview of low-pitched roofs and sub-roof systems
26 ROOM TO BREATHE
Klober’s Nick King explains why proper installation of roof
tile vents is crucial to maximising their effectiveness
42 COMMENT: NET ZERO
How practical is a net zero approach to new buildings?
Simon Storer of IMA gives his view...
46 ASK A PROCTOR
The team at A Proctor Group compare low lamda
insulants, focusing on aerogel and rigid foam solutions
48 SAFETY FIRST...
Dave Elson of WernerCo UK explains how employers can
cultivate a culture of safety in construction
4 TC MAY 2024

REGULARS
12 NFRC ROOFING TALK
James Talman, NFRC CEO, talks through the
progress being made around cash retentions
and poor payment practices – issues that can
have such a devastating impact on so many
companies in the sector
30 TOTAL TALK:
PETE HOLLINGWORTH
We put the questions to Pete Hollingworth of GP
(Georgia Pacific) Gypsum LLC, discussing his
return to the flat roofing sector and his role
developing customer and technical support for
DensDeck Roof Boards, plus much more...
30 KNAUF INSULATION
TECH TALK
Bradley Hirst explores how insulation and other
passive measures can be installed to mitigate
overheating in homes
INDUSTRY NEWS
06 LANDMARK ANNIVERSARY
This year Marley is celebrating its 100-year anniversary,
but it already has plans for its next century of operation
08 PARTNERSHIP ANNOUNCED
MOY has announced a new partnership with Seaman
Corporation, manufacturer of roofing brand Fibertite
SECTIONS:
TOTAL
ROOFING
16
TOTAL
CLADDING
36
TOTAL
INSULATION
42
06
Marley is celebrating its
100-year anniversary:
Picture shows Sir Owen Aisher,
son of founder Owen Aisher,
with his brother Jack in 1974,
Marley’s Jubilee year.
VEHICLES, TOOLS
& WORKWEAR
48
MAY 2024 TC 5

Industry News
NFRC BACKS KEYLITE’S
SAFETY CAMPAIGN
A new campaign to highlight safety when
working at heights in construction has been
launched by Keylite Roof Windows (Keylite)
in a bid to protect roofers from lifethreatening
accidents.
More news, updates and interviews at www.total-contractor.co.uk
MARLEY OUTLINES PLANS FOR THE FUTURE
AS IT CELEBRATES 100 YEARS!
Keylite’s ‘Work Smart, Stay Grounded’
campaign will see the team visit builders’
merchants across the UK and Ireland to
encourage merchants and their customers to
get involved with a ‘Challenge yourself, not your
safety’ virtual reality game.
The game aims to start a conversation around
working safely on-site and at heights with the
support of the National Federation of Roofing
Contractors (NFRC). The campaign supports
NFRC’s mission to provide standards and
guidance within the construction industry and
ultimately do the best job possible to ensure
working conditions are safe.
The Health and Safety Executive reported that a
total of 40 fatalities were attributed to falls
from height, an increase from last year’s
reported 29, highlighting the critical need for
enhanced safety measures in this category.
Keylite feels this is far too high and that all
manufacturers should be doing more to protect
construction workers by keeping their feet
firmly on the ground. Keylite believes that
through the ‘Work Smart, Stay Grounded’
campaign they can positively impact the lives
of construction workers.
Gary Walpole, Safety, Health & Environmental
Officer at the NFRC, said: “NFRC supports safe
working initiatives and welcomes the Keylite
‘Work Smart, Stay Grounded’ campaign. We
welcome forward-thinking stakeholders within
the supply chain, who produce innovative
designs within their project ranges to reduce
the risk of working at height.”
www.keyliteroofwindows.com
Leading roof system manufacturer Marley is
celebrating its 100-year anniversary.
Founded in 1924 by Owen Aisher, the company’s
inception marked a crucial milestone in the
evolution of the UK roofing industry, with the
production of Marley’s very first concrete roof
tiles beginning in a humble cowshed on Marley
Farm in Kent.
However, the company says it was the
determination and entrepreneurial spirit of its
founder’s son, Sir Owen Aisher, that led Marley to
national and international growth in the decades
following the second world war.
A century later, 2024 sees Marley proudly celebrate
100 years of continuous development, marketleading
product innovation, and technical expertise.
The intervening decades have seen Marley’s
manufacturing facilities expand and product
ranges extended from concrete to clay, together
with a range of accessories, roofing batten and
high performance underlay to deliver what the
manufacturer says is the most comprehensive
pitched roof system on the market.
However, Marley says its commitment to innovation
has not stood still, and in recent years, the company
introduced the UK’s first fully roof integrated solar
PV panel, Marley SolarTile. Today, the company’s
solar roof system offering is now complemented
with a package of additional inverters, battery
storage solutions, and an EV charging point to
provide a complete renewable energy system, all
available from a single trusted source.
Daniel Redfern of Marley explained: “We are
delighted to celebrate Marley’s 100th anniversary
this year. The milestone is testimony to the hard
work, diligence, and innovating spirit of
colleagues across the decades who have
contributed to our collective and ongoing success.
“For any business to be successful for a century
is a real achievement, and we have managed this
because we have continued to react to the
market, understand what customers want, and
create the system and product solutions that
deliver high performing and beautiful roofscapes.
“As we move into our next century of operation,
Marley remains focussed on strategic progression,
especially as sustainable solutions become more
of a priority for everyone. A growing renewable
technology package now complements our
traditional clay and concrete tile ranges and fully
integrated roofing system offer, underpinned by
our industry-leading package of technical support,
developed to assist the roofing industry for years
to come.”
www.marley.co.uk
6 TC MAY 2024

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Industry News
ELEVATE JOINS FORCES
WITH FDT
Holcim has acquired German-based
roofing membrane manufacturer,
Flachdach Technologie GmbH (FDT).
With a 150-history, FDT has forged a leading
reputation for developing Rhenofol PVC and
Rhepanol polyisobutylene (PIB) roofing
membranes for flat roofs. The acquisition will
see FDT join Elevate under Holcim’s business
envelope division, expanding its product range
for the roofing industry, including UK
installers, specifiers and distributors.
The deal follows Holcim’s acquisition of
Firestone Building Products in 2021, which
now operates under the Elevate brand.
Philip Moors, Managing Director of Elevate UK
and Ireland, commented: “FDT offers a range
of innovative products for flat roofs, which
complement the leading EPDM and TPO
membranes manufactured by Holcim. These
synergies will provide our customers with a
complete choice of solutions offering highperformance
waterproofing for applications
across the commercial, industrial and
residential sectors.”
Robert Forster, Managing Director Holcim
Solutions and Products EMEA, added: “The
acquisition of FDT is in line with our ambition
to become a global leader in roofing systems.
Due to its leadership in technology and
sustainability, as well as its strong customer
relationships, FDT will play an important role
in the expansion into the most attractive
European roofing markets.”
www.holcimelevate.com
More news, updates and interviews at www.total-contractor.co.uk
MOY & FIBERTITE ANNOUNCE PARTNERSHIP
Leading service provider of
flat roof waterproofing
systems, MOY, has
announced an exciting new
partnership with Seaman
Corporation, the
history of the trusted FiberTite
brand will allow us to operate
and provide an enhanced
solution in comparison to the
systems currently available in
our markets.
manufacturer of global
“This exclusive partnership
roofing brand, FiberTite.
expands our product portfolio
Scott Gipson, Senior Vice President, Seaman
With a combined 95 years in
Corporation (left) with Cathal Quinn, Group
of high-performing solutions
business, MOY says this exciting
partnership and joint venture
Managing Director of MOY.
for critical infrastructures,
enhancing the existing offering
will provide the existing client base with a consistent
product quality and service offering that has come to
be expected globally from the FiberTite brand.
As a world-leading manufacturer of single-ply
roofing membranes, Seaman Corp. developed a
unique four-layer technology, providing superior
puncture, chemical, UV, and ponding water
resistance, which has been adopted by some of
the world’s leading clients on the most demanding
roofs, for over forty years.
Cathal Quinn, Group Managing Director,
commented: “The FiberTite product typology
doesn’t exist anywhere else in the world. Access
to this product allows MOY to further engage and
serve the Critical Infrastructure sectors. Prior to
this partnership, we were reluctant to supply our
clients a single-ply system into the demanding
roof spaces found in the Critical Infrastructure
sector. However, the robust offering and proven
to our client base across the Irish, UK, and
European regions.”
Scott Gipson, Senior Vice President, Seaman
Corporation, representing the FiberTite brand,
said: “We offer a product that is quite like nothing
else in the marketplace, we hear this from many
specifiers and clients. We have developed a
formulation that gives our product unrivaled
characteristics for longevity over time, as well as
many other unique properties, so it’s proven to be
as failproof as possible.
There are so many similarities between the two
brands in our core values and our service-driven
culture. By partnering with the MOY team, it
opens up opportunities across the globe, by
providing localised support and expertise – a
standard of excellence synonymous with the
FiberTite brand.”
https://moymaterials.com/FiberTite/
The Rooflight Association has published a series of ‘Quickguides’ covering the fire
rating requirements for use of rooflights in buildings for each of the four
devolved UK nations.
The new Quickguides provide clear information on the current fire rating classification
requirements for internal walls and ceilings, and roof coverings, which apply to rooflights.
They also include guidance on the allowances and restrictions relating to the use of thermoplastic
rooflights. Stuart Middle, Director and Technical Committee representative at The Rooflight Association,
said: “These new documents form part of our on-line technical library of Quickguides and Technical
Documents, allowing specifiers free access to key information.” As the trade association representing
the rooflight industry, The Rooflight Association is the UK’s pre-eminent independent provider of
rooflighting technical information. The four new Quickguides 10EN, 10SC, 10NI and 10WA, can all be
downloaded free of charge from: https://rooflightassociation.org/fire-performance/
8 TC MAY 2024

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It’s more
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designed to work together, whilst making the most of the
growing demand for roof integrated solar panels.
It’s more than a roof, it’s an opportunity for roofers.
marley.co.uk

NFRC Roofing Talk
AN UPDATE ON CASH RETENTIONS
James Talman, NFRC CEO, talks through the progress being made around cash retentions
and poor payment practices...
When Matt Downs, the Editor of Total
Contractor, asked if we could give any
updates on guidance around dealing with
poor payment practices and retentions, I checked
back through previous Total Contractor editions
which covered the NFRC’s concerted push on
retentions in last August’s edition, and the
challenge regarding poor payment practices looking
at the year ahead in the February 2024 edition.
So, let us start with retentions, which readers may
know is the single biggest issue that NFRC
Members would like to see eradicated. Since our
event at the House of Commons last year we have
had several meetings with supportive MPs and
Peers regarding the abolishment of retentions. We
have continued to provide evidence through our
member surveys of the issue’s debilitating impact.
This has included a meeting in January between our
supporting MP Andrew Lewer MBE, and Minister
Kevin Hollinrake MP (then Under Secretary of State,
now Minister of State in the Department for
Business and Trade), amid the Minister’s busy
schedule dealing with the sub postmasters Horizon
scandal. The minister acknowledged that action
was needed, and we await to see in what form
regulations follow.
Aside from tackling the issue at Westminster, we
continue to work collaboratively with the Construction
Leadership Council (CLC) and Build UK to recognise
that retention is an outmoded instrument in the
roofing sector. The CLC are clear in their ambition to
end retention but place caveats to this achievement.
One example is the concern of no other surety in
place. The roofing market is dictated by the
requirement to provide material and installation
warranties providing this surety on completion.
As previously stated, we need in our sector to
remove the misnomer amongst clients and tier one
contractors that retention is linked to quality. Aside
from warranties, all roofing contractors will – and
Above: James Talman, CEO of NFRC.
are – seeing higher demands on
proof of competency along with
great scrutiny of projects. This is
reflected in NFRC’s support of its
members alongside the
requirements for contractors
registered to NFRC CPS competent
persons scheme, the latter now under the direct
authority of the HSE. At a recent meeting involving
senior procurement executives from tier one
contractors, it was clear that they were receptive to
the need to recognise this commitment by NFRC,
and its members, to invest in skills development
alongside competency scrutiny, and we look forward
to further constructive dialogue; to repeat our
rallying call: allow our members to invest in their
businesses through retaining skills not holding their
cash.
Late payment ‘plague’
Alongside retentions, late payment continues to
plague the industry and is a key concern amongst
our members. Less than a third of respondents to
our year-end survey stated they were paid within
thirty-day terms and the figures were only slightly
better for those on longer terms. This has been a
consistent trend ever since we started our surveys.
We are supportive of the Government’s statutory
reporting duty on Business Payment Practices
enabling one to check when large businesses pay
their suppliers, and its impending update, along
with the associated construction sector payment
performance tables published by Build UK. However
Above: MP Andrew Lewer (left) with Kevin
Hollinrake MP, Minister of State in the
Department for Business and Trade.
these measures are not, on the face of it, improving
the fortunes of the majority of our members. The
knock-on impact for SME’s, micro businesses and
the self-employed is too often ignored in favour of
others who are a strategic
risk to a large organisation
if not paid within terms.
We will continue to work
across the construction
sector to tackle late
payment and support NFRC
members where there is
clear evidence of noncontestable
delay.
Lord Fox LD made a very valid observation during a
recent debate in the House of Lords on late
payments and the reporting duties, stating: ‘My
Lords, finally – I am not to be outdone – the
Minister sets a lot of store on the public
embarrassment issue. I come back to the balance
of jeopardy: the Minister is a businessman of the
world and he knows that, if you have a publicly
listed company, it can make sure it reaches its
numbers by the end of the year by extending its
outgoings into the following year – it happens all
the time. Which is more embarrassing to the board?
not meeting its financial projections to the Stock
Exchange or having a dirty note in its annual report
12 months later?’
Until and unless a future government tightens
payment regulations, the message is clear – be
unequivocal on your payment terms, report flagrant
avoidance to your trade body and make sure the
‘dirty note’ is not in your annual accounts.
Contact NFRC
020 7638 7663
www.nfrc.co.uk
NFRC
12 TC MAY 2024

TAKE YOUR
ROOFING BUSINESS
TO THE NEXT LEVEL WITH NFRC
Technical advice, the industry quality stamp and fantastic
profile-raising opportunities—for all roofing disciplines
NFRC sets the highest
standards for work across
all roofing and cladding
disciplines. But we’re much
more than the industry’s quality
assurance stamp. Membership
of the trade association offers
contractors and suppliers a
range of powerful technical
and commercial advantages.
These include a profile on our website
and directory listing, making your
business easier for clients to find. Plus
exclusive access to technical support and
updates, an exclusive health and safety
app, and advice on training provision.
For suppliers, key benefits include
numerous opportunities to engage with
roofing contractors all over the country.
And as the voice of the roofing sector,
NFRC makes our members’ views
heard where it matters most. We work
with government, standards bodies
and training providers to promote the
interests of the industry, and of the
construction market as a whole.
3 | Working Towards Zero Avoidable Waste in the Roofing Sector
NFRC trade
membership benefits
WHAT BEING AN NFRC MEMBER MEANS FOR YOU
3 | Working Towards Zero Avoidable Waste in the Roofing Sector
NFRC supplier
membership benefits
EXCLUSIVE ACCESS TO OUR ROOFING
CONTRACTOR MEMBERS
Call 020 7638 7663 or visit
nfrc.co.uk/TCbenefits to request our
benefits brochure—and find out more
about what NFRC membership can do
for your business.
NFRC GROUP ALSO INCLUDES
Competent Person Scheme:
self-certify roof refurbishment
to Building Regs
Roofing operatives
competency accreditation
Promoting roofing as a
skilled profession and
offering career advice
UK’s premier event for
the roofing industry
Supporting hardship, training/
upskilling, volunteering
and environment
Contractors with knowledge,
skills and experience of
heritage roofing systems

Business Planning
THE SECRET OF SUCCESSION
Alice Rees, Partner and solicitor specialising in corporate law services at leading East
Midlands firm Nelsons, discusses the importance of succession planning, and how
addressing this early on can provide a clear pathway for the next generation and a secure
future for the business...
It’s no secret that construction is facing an
uncertain future with its ageing workforce and
a lack of young blood taking up roles. When it
comes to smaller, owner-managed and family
businesses, planning for the next stages is critical.
Business owners need to engage with the ‘what
ifs?’ – is there a plan for the business in the
event of death or illness? Thought should be given
to a tax-efficient and carefully managed exit, to
secure the future of the business while allowing
the founders to realise value for the years of hard
work and risk. In an ideal world, owners have
planned and discussed these elements already,
but this is often not the reality, as running a
business doesn’t always allow for much beyond
the immediate and medium-term challenges.
Creating a pathway
Where a company has two or more shareholders,
a shareholders’ agreement coupled with a
bespoke set of articles of association is essential.
These documents together regulate conduct
between the owners and provide certainty around
decision making and, critically, in respect of
succession, restrictions and a pathway for where
the shares might end up in the event of death,
illness and/or incapacity.
For unplanned exits such as death and
incapacity, a shareholders’ agreement can guide
the shareholders through a step-by-step process
to facilitate the transfer of shares from the
deceased/incapacitated shareholder. Having
those processes pre-determined can mitigate
some of the stress of doing so in difficult or
emotional situations. Owners should also be
considering whether shareholder protection
Alice Rees, Partner
at Nelsons
insurance might be appropriate and available,
which can be linked to appropriately drafted cross
option agreements.
The documents should be tailored to the specific
business’ needs and, as with all succession
planning, they should be reviewed regularly to
ensure they remain relevant. Business owners
should make time to sit down with the relevant
advisors to tackle these decisions.
Passing the torch
Identifying the right successor requires careful
thought and can involve difficult conversations,
and consequently difficult decisions. The owners
should consider whether the business has
appropriate family members, a management
team, or perhaps a combination of both, who are
willing and able to step into ownership.
If a management buy-out is the most likely
scenario then advice should be taken early to
structure a transaction that provides value for the
family founders, and stability and financial
security for the business and incoming owners.
Oxford Economics reports that 18% of all UK
family businesses are found in the construction
“Careful planning
from the outset can
help to structure any
exit or transition in
the most efficient
and cost-effective
way possible”
sector – more than any other industry – and this
prevalence looks set to stay. Those conversations
with children or other family members should
happen early, to ensure everyone is on the same
page and identify whether there are any
individuals who are ready to take on the business
in future. For those not interested in being
involved in the family business, how can they still
benefit from the value in the family business?
It may be that more time needs to be dedicated to
training and knowledge sharing to keep the skills
and insight strong. And likewise, assessing how
family members work with other people in the
business and how these bonds can be
strengthened.
But having a desired internal successor doesn’t
always work out. It may be that incentives are
needed for ‘key’ individuals to remain with and
continue to build the business that go beyond
bonuses and pay reviews. This could be in the
form of growth shares, or some other employee
share scheme.
If succession from within is not an option, with no
one identified as having the right skills or desire
to take on the business, a recruitment drive may
14 TC MAY 2024

e worth the investment. The succession plan
could be built into the hiring process to ensure
the right people are identified and share the
ambitions of the current owners.
Trade sale
If no internal successor is identified, then it may
be that engaging with appropriate advisors to
market the business for a trade sale or private
equity exit is the prudent option to maximise
value for the founders’ family. This could be for a
total exit or on a phased basis such that the
founders remain in the business on an
employed/consultancy basis with or without an
equity interest.
A transaction involving a third party, whether a
competitor, a business within the supply chain or
private equity, is an intense process and any
potential buyer will undertake a due diligence
process to investigate the target. It is critical that
a seller or sellers have the right advisors in place
to guide them through this, and it is never too
early to start getting the house in order in
readiness.
Don’t go it alone
Succession planning can be a minefield; it’s
recommended to seek professional advisors from
the start who can support with financial and legal
matters, as well as advise on tax. Careful
planning from the outset can help to structure any
exit or transition in the most efficient and costeffective
way possible.
Nelsons provides a range of legal services;
through its corporate team we deal with the legal
aspects of succession – in whatever form it
might take – and we work closely with our fellow
professionals in corporate finance and tax
advisory to ensure the best possible outcomes for
clients. Find out more via the contact details
below.
Insurance provider partners with Band of Builders
Small business insurance provider, blip, is
working with Band of Builders (BoB) as
its charity partner, offering affordable
insurance and support to its network of
tradespeople from less than £10 a month.
blip offers ‘affordable, tailored, and easy-tounderstand
insurance’ with a ‘pioneering
model’, where members share in the profits
collectively. BoB, a registered charity that
completes practical projects to help members of
the UK construction industry and their families
who are battling illness or injury, was an
obvious choice for a partner. blip and BoB share
a common mission for the new partnership,
removing stress and worry in times of crisis for
tradespeople, and offering peace of mind when
starting or running a business.
The partnership will see blip support BoB
through charitable sponsorship and by providing
blip members the opportunity to donate the
value of up to 10% of their premium to BoB
through its pioneering profit share model.
Gary Ross, Founder and CEO of blip, said: “We
are delighted to be partnering with BoB to
deliver life-changing support to tradespeople
going through tough times. They put real people
Gavin Crane, CEO
of Band of Builders
first and that’s exactly what we do at blip.”
He continued: “Growing up with family working
in the trades I know first-hand the toll it can
take mentally and physically – together blip and
BoB are working to alleviate this pressure. We
are supporting the people who keep our
communities running by ensuring they have the
protection they need and a community around
them.”
Gavin Crane, CEO of BoB, said: “Teaming up
with blip, who share our passion for giving back,
marks a significant step forward in enhancing
the wellbeing of our community. In the
construction industry, when life poses
challenges, decision-making can be difficult for
small business owners. blip’s business toolkits
provide practical templates and guidance,
easing stress and enabling businesses to grow.
This collaboration is a positive step in tackling
the challenges faced by tradespeople, offering
actionable support for our community
members.”
For a detailed insight into blip’s offerings and
coverage to business owners, visit
www.justablip.co.uk or to get involved with
BoB, visit bandofbuilders.org
Contact Nelsons
0800 024 1976
www.nelsonslaw.co.uk/corporate-services
Nelsons
MAY 2024 TC 15

Ask the Expert
REVIVING LINCOLN PANTILES
Kevin Taylor of Marley discusses the recent re-launch and expansion of the Lincoln clay
pantiles range, which is now manufactured in the UK, plus answers the key pantile
installation queries the Marley Technical Team receive...
For centuries, clay pantiles have been, and
remain, a highly popular roofing solution,
especially in the East and South of England.
Combining tradition and aesthetic beauty, a
pantile roof offers kerbside appeal alongside
proven performance.
As pantile roofs continue to be specified, it is
important that contractors are aware of the
increasing choices available, and understand how
to overcome some common installation
challenges.
Made in Britain
Marley has re-launched a new range of its longstanding
Lincoln clay pantiles, which will become
one of the only clay pantiles manufactured in
Britain.
The Lincoln Clay Interlocking Pantile, with an s-
curve profile and thin leading edge, offers roofing
contractors – and their customers – a series of
design enhancements to underpin the product’s
traditional appearance and robust performance.
Production for the new Lincoln is located at
Marley’s site in Keele. The clay used for its
manufacture is sourced from nearby quarries,
meaning Marley is able to offer the same
colourway found on its Red Smooth Single
Camber Clay Plain Tiles.
This makes Marley one of the only providers of a
British-made clay pantile, delivering an additional
confidence boost for the trade that relies upon
product availability when assessing project
timescales and booking new work.
From an aesthetic perspective, the new Lincoln
Clay Interlocking Pantile range is available in
single coloured Red Smooth, and Rustic Red,
which incorporates a flash of black dusting to
Above: Marley’s Lincoln Clay Pantile offering now includes
Rustic Red (left) and Red Smooth (right).
create a more weathered appearance and
enhanced attractiveness. The two colours can
also be combined across the roof, creating more
options for a unique and traditional appearance.
With a minimum pitch of 22.5°, the Lincoln’s
open gauge design offers a quick and easy
installation and is also fully compatible with its
roof integrated Marley SolarTile.
How to install clay pantiles...
To make things as easy as possible for
contractors, we have answered some of the most
common pantile installation queries, below.
What is the minimum pitch for a clay
pantile?
It depends on the tile you are using. Traditional
machine-made clay pantiles tend to have a
minimum pitch of around 30 degrees. Marley’s
new Lincoln interlocking pantile can be used
down to a pitch of just 22.5°, giving contractors a
low pitch traditional option.
Can a dry fix system be used with a clay
pantile?
Some handmade and traditional machine-made
pantiles may not be suitable for use with dry fix
systems because they have deep and sweeping
rolls, with natural variations in size, which means
there can be gaps. While BS 5534 requires all
ridges and hips to be mechanically fixed, this
does not have to be dry fix. For some pantile
projects, such as particularly sensitive
refurbishments or projects in conservation areas,
sometimes dry fix is not the right option
aesthetically. In these cases, mortar bedding in
conjunction with a mechanical fixing kit to ensure
BS 5534 compliance while maintaining traditional
aesthetics should be used.
Does the pantile have to be installed to
BS 5534?
Yes, but there are some special exceptions for
heritage and historical projects. If in doubt check
with the local planning office. However, for the
majority of new and refurbishment projects,
pantile roofs will have to meet BS 5534 fixing
requirements, which means all pantiles have to
be mechanically fixed with nails and/or clips,
depending on location and exposure. Some
modern machine-made traditional pantiles, such
as Lincoln, do have nail holes drilled into them to
make this a bit easier.
Will an interlocking pantile be accepted
by planning departments?
It depends on the area and the type of project.
Lincoln Interlocking Clay Pantiles have been
approved for barn conversions in conservation
areas, and many planning departments across
the country are happy for them to be used.
However, inevitably there will be some projects,
particularly heritage developments or sensitive
refurbishments, where an interlocking tile won’t
be accepted either by planning or for aesthetic
reasons.
Contact Marley
www.marley.co.uk/roof-tiles/clay-roof-tiles/
lincoln-single-pantile
Marley
16 TC MAY 2024

WestWood Liquid Technologies Limited
31 Morris Road, Nuffi eld Industrial Estate,
Poole, Dorset BH17 0GG
Phone: +44 800 808 5480
Liquid Applied Waterproofi ng Systems
Car Parks • Flat Roofs • Metal Roofs • Gutters • Roof Terraces Balconies

Workforce and Skills
APPRENTICESHIPS CAN BE THE
LONG-TERM SOLUTION…
In this column for Total Contractor, Fraser Biles of BMI UK & Ireland explores the
importance of apprenticeships for employers, plus shares advice on maximising their
potential.
In the past year, apprenticeship starts
increased by 2.5% with the number of people
embarking on apprenticeships across all
industries surpassing 200,000. Last month, the
Prime Minister announced a new government
pledge to create an additional 20,000
apprenticeships with £60m of new government
funding for next year. They plan to implement a
series of reforms, which include funding the full
cost of apprenticeships for under-21s and making
it easier for small businesses to create
opportunities for apprentices.
Fraser Biles presenting
at BMI’s annual
Apprentice of the Year
competition.
Euan Forsyth, BMI’s Pitched
Roofing Apprentice of the
Year 2023.
For businesses across the roofing industry, this
presents an opportunity to grow their teams and
future proof their operations through the proven
approach of apprenticeship schemes. Through
our work with roofing contractors and their
apprentices – as well as our BMI Apprentice of
the Year competition and work with roofing
colleges and training groups – we’ve seen the
benefits of apprenticeships first-hand.
Behind every successful apprenticeship is a story
of growth – from individuals taking on new
challenges and learning new skills, through to
employers strengthening their businesses.
Championing apprenticeships
There are three pillars at the heart of a successful
roofing apprenticeship scheme – the apprentice,
the employer and the training provider. For
employers, this will mean making sure their
business is set up to accommodate an apprentice,
which includes having the flexibility to factor
college days and training into work schedules.
They also need to decide on a champion – or
mentor – within the business to work with the
“There are three pillars at the heart of a
successful roofing apprenticeship scheme – the
apprentice, the employer and the training
provider”
apprentice. We’ve seen through our annual
Apprentice of the Year competition that these
people have a far-reaching impact and can be the
difference between success and failure. Often, a
mentor will have been through an apprenticeship
themselves, so they’ll understand the process
from start to finish and can provide support and
guidance where needed.
According to the National Apprenticeship Service,
businesses that have taken on apprentices have
benefitted from more motivated and satisfied
teams, with 86% saying apprenticeships have
helped them to develop skills relevant to their
business, and 80% seeing increases in employee
retention. In short, committing to apprenticeship
schemes can help firms in many areas of their
business that will sustain them far into the future.
Making the most of apprenticeships
Built on traditional skills – the sort that are
passed down from one generation to another –
alongside modern techniques and technologies,
the roofing industry is a clear beneficiary of
apprenticeships, with successful schemes
helping to unlock the potential of the next
generation of roofers.
Alongside the commitment of businesses and
training providers, support is also available from
manufacturers. Through the BMI Academy,
roofing firms can access industry-leading
training, expertise and resources.
Contact BMI UK & Ireland
www.bmigroup.com/uk/aoty
BMI UK & Ireland
18 TC MAY 2024

ISOLINE LOW LINE is our easy to install bituminous sub-roof system
for installation beneath any roof tile at a pitch as low as 10 degrees.
ISOLINE LOW LINE. The sustainable option for a long-lasting, waterproofing solution
that will ensure protection against even the harshest weather. And that’s guaranteed.
www.onduline.co.uk
For more information email us
at enquires@onduline.net or
scan the QR code.

Product Choice
BUILDING TRUST: A FOCUS ON CCPI
Gavin White, Head of Product Management - Roofing at Sika, explains why when it comes
to product choice and the systems being installed on projects, in terms of product
information, transparency and traceability are absolutely crucial...
Whether you are specifying, using,
choosing or maintaining a construction
product, you are basing your actions,
and indeed your trust, on the product information
available to you. This information can be
published on a website, it could have been sent
to you in the form of a written specification
document, or it could have even been provided
by email. However, questions have been raised
about the accuracy of the data available and the
processes in place to maintain its validity. As a
result, a large proportion of the construction
industry has been calling for a culture shift
towards enhanced traceability and transparency
in the way product information is managed and
presented.
That is why the Code for Construction Product
Information (CCPI) could not have come sooner
for the built environment. Initiated by the
Construction Product Association (CPA) as a
direct result of Dame Judith Hackitt’s review of
Building Regulations and Fire Safety, the new
code has been created to promote an urgent
move towards increased transparency and
traceability in the way manufacturers create,
manage and present product information.
Decoding the CCPI
The code features 11 robust ways of working to
ensure compliance around many aspects of
product information management. The 11
clauses can be divided into four sections:
Information Creation; Core Information;
Associated Information; and Support and
Competence. It means that those specifying and
purchasing the products can have confidence
that all the information available is correct, up to
date, accessible and unambiguous. It aims to
provide additional peace of mind in terms of
Gavin White, Head of
Product Management –
Roofing at Sika
“The hope is that CCPI
becomes increasingly
adopted and
prioritised, and the
move towards more
transparency and
traceability is
continued”
warranties and guarantees, providing extra
clarity and assurance on terms and
requirements.
Information Creation: Clauses 1-3 of the code
requires product information to be thoroughly
considered from the very start of the process.
Therefore, there needs to be clear ownership,
process, and structures in place for how product
information is created and managed throughout
its lifecycle. There should be effective means to
ensure version control and language should not
be misleading or ambiguous.
Core Information: Clauses 4-7 ensure that
product information is clear, accessible and
always up to date. It highlights how important it
is for the product information to be relied upon,
and the necessity for regular reviews by
competent people. It includes the requirements
to provide valid and demonstrable
documentation when claiming compliance to or
achievement of any certification, classification or
industry standard, and provide verifiable
information when making any product
performance claims which are outside of
certification, classification or industry standard
tests. It also requires companies to make
available on their webpage the descriptive and
physical characteristics of the construction
product and to ensure all changes affecting
product information are identified and changed
through the correct procedures.
Associated Information: Clauses 8-9 of the
code deal with the product information pertinent
to handling, installation, operation, maintenance
and disposal, along with transparency on
warranties and guarantees. Specifically, it means
publishing the associated information clearly on
the company website, and to cover any
guarantee or warranty information in precise
detail including terms, exclusions and
requirements.
Support and Competence: Clauses 10 and 11
require manufacturers to take responsibility for
ensuring their staff are competent for the role
they undertake, and that access to advice and
help is straightforward. It also emphasises that
there should be an awareness of individual
competence levels and any limitations
associated to the handling of product
information. The clauses lay out the need for
visible technical helpline contact details on
company websites, and to have in place a robust
20 TC MAY 2024

“CCPI forms part of the bigger
picture, and only by continuing the
conversation can we change the
industry and truly prioritise building
safety”
training programme to ensure any role that requires giving out product
information is competent to the level of knowledge required for their role.
CCPI at Sika Limited
Sika has historically recognised the importance of traceability and
transparency within its products and services, and therefore rigorous
processes were already in place prior to CCPI certification. In fact, Sika
was part of the initial industry consultation process which was set up to
develop the code.
To comply with CCPI, Sika followed three important steps. Firstly, it
conducted a large leadership and culture survey which sampled
colleagues from a number of roles that have influence over products and
product information. This was crucial in demonstrating that there is a
supportive and conducive environment for the adoption and
implementation of best practices for construction product information.
The second phase involved providing evidence of Sika’s management
systems, including those governing the creation, management and
presentation of product information. The evidence focused on areas such
as what systems are in place, who is in charge of maintaining and
updating the systems and their competence to do so.
The last stage for Sika was the submission of product sets for
assessment and verification in accordance with the 11 clauses of the
code. Product set verification looks at a whole range of aspects to ensure
that information associated is clear, accurate, up-to-date, accessible and
unambiguous. Sika is proud to have successfully achieved CCPI across all
four of its product sets.
The future of CCPI
The success of the CCPI will be based on its industry-wide adoption, but
at Sika it is an incredibly important aspect of the organisation. The hope
is that CCPI becomes increasingly adopted and prioritised, and the move
towards more transparency and traceability is continued. CCPI forms part
of the bigger picture, and only by continuing the conversation can we
change the industry and truly prioritise building safety.
The Steinel MH7 18V
Cordless Welding Gun.
• Every Roofer should have one!
• Ideal for use on Single-Ply EPDM roofing
materials for repairs etc.
• No power leads required.
Contact Steinel (UK) Ltd for details:
E: steinel@steinel.co.uk
T: 01733-366 700
Contact Sika
www.sika.co.uk/roofing
01707 394444
25 Manasty Road, Orton Southgate, Peterborough. PE2 6UP

Pitched Roofing
LOW-PITCHED ROOFS:
ALL YOU NEED TO KNOW...
Roof pitches not only contribute to a building’s aesthetic appeal but also play a crucial role
in its functionality and durability. With this in mind, Ardit Strica, Technical Manager at
Onduline Building Products, provides a comprehensive overview of low-pitched roofs, their
challenges, and the transformative benefits of sub-roof systems.
Understanding roof pitches
The definition of a pitched roof, according to
British Standard BS 5534, is a roof with a
pitch greater than 10° and less than 75°.
For low-pitched roofs, anything under 20° is
generally considered as low pitch, while anything
below 10° is deemed a flat roof.
Several factors influence the selection of a roof
pitch, including material availability and cost,
aesthetics, construction ease or difficulty,
weather conditions, and local building
permissions. The client’s preferences and the
architect’s designs also play a pivotal role in
determining the roof pitch, as it significantly
impacts the external appearance of a building,
making it a crucial aesthetic consideration.
The pitch of a roof is not only an aesthetic choice
but also a practical one. Different loads, such as
snow, wind, dead load, and live load, exert forces
on a roof structure, making it essential to tailor
the pitch to suit the local weather conditions. The
choice of roofing material further influences the
final pitch, with concrete, clay, and slate being
common options. However, low-pitched roofs
present unique challenges, particularly in terms
of effective water drainage.
The challenge of low-pitched roofs
Low-pitched roofs, which are often applied to
extensions, come with their set of advantages
and challenges. While they may be considered
more aesthetically pleasing than flat roofs, slow
water runoff and limited tiling options are key
drawbacks.
In contrast to steep pitched roofs, where water
runoff is rapid due to gravity, low-pitched roofs
struggle to shed water efficiently. This can lead to
water pooling on the roof, causing leaks and
potential damage to the property. Additionally, the
limited availability of suitable tiles for low-pitched
Images show Onduline’s ISOLINE
LOW LINE roofing system.

oofs poses a challenge for designers and
builders.
In recent years, changes in permitted
development rights have provided homeowners
with greater flexibility in renovating and extending
their properties, making low-pitched roofs more
appealing. The option to lower a roof pitch gains
traction as it allows for additional ceiling space,
aligning with the increased trend in property
extensions and renovations.
The choice of roof pitch becomes crucial in home
extensions, with flat roofs being a common option
due to their space-saving and contemporary
aesthetics. However, pitched roofs, especially
those matching the main property, contribute to a
more cohesive visual appeal. The introduction of
low-pitched roofs in extensions provides an
opportunity to use matching tiles, ensuring
uniformity with the existing property.
The role of sub-roof systems
While low-pitched roofs offer several advantages,
the limitation in available roofing tiles has been a
significant hurdle. This is where sub-roof systems
come into play, revolutionising the possibilities for
roofing design and functionality.
A sub-roof is an additional protective layer within
the roof structure, acting as the primary
waterproofing layer under the tiles when the tiles’
minimum pitch cannot be met. British Standard
BS 5534 acknowledges situations where using
roofing products below the recommended pitch is
challenging and emphasises the need for a
functional, weatherproof sub-roof system.
Sub-roof systems change the dynamics of
traditional roof structures. Instead of relying
solely on tiles for waterproofing, the sub-roof
becomes the main waterproofing layer, allowing
the tiles to serve as a secondary defence against
water ingress. This innovation enables the use of
all types of concrete, slate, and clay roof tiles at
pitches as low as 10°.
Flat sub-roofs, involving non-breathable felt on a
rigid sarking board, and corrugated sub-roofs,
“The ability to create visually appealing,
functional, and watertight low-pitched roofs
opens up new avenues for architectural
creativity and sustainable construction
practices”
utilising bituminous corrugated roof sheets, are
two prevalent options in the market. While both
provide solutions for low-pitched roofs,
corrugated sub-roofs offer enhanced ventilation,
minimising the risk of moisture build-up and
timber rot.
The rise in popularity of sub-roof systems is
attributed to the newfound freedom they offer in
roofing projects. Whether the project involves a
low-pitched roof or not, a suitable sub-roof
system provides flexibility in choosing roof tiles,
enhancing both aesthetics and functionality.
Options for heritage projects
One significant advantage of sub-roof systems is
their ability to accommodate heritage sites and
older properties. By allowing the use of existing or
reclaimed tiles, sub-roofs maintain the original look
and feel of the property while providing an
additional layer of protection against water ingress.
A prime example of an innovative sub-roof
system is our ISOLINE LOW LINE solution, which
is the only sub-roof system in the UK to be BRE
tested and BBA accredited to as low as 10º with
a 30-year guarantee. Made from approximately
50% recycled material and specifically designed
for use on low pitch roofs, this lightweight
bituminous underlay sheeting is fitted under roof
tiles, thus being shielded from elements such as
wind and rain, making it an exceptional longlasting
waterproofing solution.
As the construction industry continues to evolve,
innovations like sub-roof systems play a crucial
role in addressing challenges and expanding
possibilities. The ability to create visually
appealing, functional, and watertight low-pitched
roofs opens up new avenues for architectural
creativity and sustainable construction practices.
With a deeper understanding of these concepts,
professionals in the field can make informed
decisions that contribute to the overall success
and longevity of their projects.
Find out more about Onduline ISOLINE LOW LINE:
www.onduline.co.uk
MAY 2024 TC 23

Roofing Updates
MARLEY LINCOLN UPDATE
For further info on all these updates and more, visit www.total-contractor.co.uk
Marley has re-launched a new range of its
long-standing Lincoln clay pantiles, which
will become one of the only clay pantiles
manufactured in Britain.
The Lincoln Clay Interlocking Pantile with an
s-curve profile and thin leading edge, is now
available and offers roofing contractors and their
customers a series of design enhancements that
underpin the product’s traditional appearance and
robust performance. Production for the new Lincoln
has moved to Keele in Staffordshire from Germany,
with the clay used for its manufacture sourced
from nearby quarries, meaning Marley is now able
to offer the same colourway found on its Red
Smooth Single Camber Clay Plain Tiles.
This makes Marley one of the only providers of a
British-made clay pantile, delivering an additional
confidence boost to the region’s manufacturing
capacity.
Marley says the decision to transition production to
the UK will deliver environmental benefits too,
through a reduction in shipping and transport
requirements, and subsequent reductions in
associated carbon emissions. The manufacturer
says it will also provide additional versatility and
assurance of product supply for the UK roofing
sector.
The new Lincoln Clay Interlocking Pantile range is
available in single coloured Red Smooth, and Rustic
Red, which incorporates a flash of dusting to create
a more weathered appearance and enhanced kerbside
appeal. The two colours can also be combined
across the roof, creating more options for a unique
and traditional appearance. Changes have also
been made to the texture of the pantile, so that it
offers a marked heritage aesthetic, which will open
up business opportunity for installers, ensure
greater design choice for specifiers, and delight
homeowners.
Combining the traditional look and feel of a clay
pantile with longevity of performance, makes the
new Lincoln an ideal roofing solution for both new
builds, existing refurbishments and extensions.
Marley says the Lincoln offers simple installation
for roofing contractors with its open gauge design
and 22.5° minimum pitch.
Stuart Nicholson, Roof Systems Director, for Marley,
said: “As part of our ongoing commitment to
support the UK roofing industry, Marley has taken
the strategic decision to move the production of the
Lincoln Interlocking Clay Pantile to our site in
Keele, making us one of the only providers of a
clay pantile here in Britain. Using locally sourced
materials will ensure the environmental impact
of the new Lincoln is minimised, while the subtle
changes we have made to the colour and texture
of the pantile will maintain its attractive
aesthetic appeal and popularity, which have
underpinned its past success.”
www.marley.co.uk
CHURCH ROOF PRAYERS ANSWERED
The only surviving church by the Georgian/Regency
architect John Nash is enjoying a new lease of life in its
bicentenary, thanks to Welsh Slate.
All Souls Church, in the Harley Street Conservation Area of
Marylebone, London, has been reroofed with 20" x 12" Countygrade
Penrhyn Heather Blue slates from Welsh Slate as part of a
Credit: Will Pryce
wholescale refurbishment of the iconic Grade I listed building. The
Above: All Souls Church, Marylebone, London – Specifiers Matthew Lloyd Architects, who specialise in historic
first phase, to the external fabric, required a temporary roof and and heritage buildings and are a conservation-accredited practice, have specified Welsh Slate on numerous
occasions for a variety of church and secular buildings.
full scaffolding reaching to the top of the spire which now has
ability to light up in any colour to suit the seasons and festivities. The scaffolding had to be engineered in great detail as the church occupies 100% of its ownership
footprint. The Welsh slates were installed over 240m 2 of the main nave roof, which has a pitch of 28°, using 38mm thick copper nails, and the flat roofs of the
aisles, half of which had been covered in copper after the Second World War, were laid with 16 tonnes of lead, by roofing contractors Lead Roof Solutions for
main contractor Quinn London. The roof, which is hipped at the south-west end and incorporates a timber louvred structure for ventilation, is also fitted with
several conservation rooflights which sit flush with the slates. To improve ventilation, the Welsh slates were counter-battened to raise the roof level, and to
incorporate this, secret gutters were used at the abutments and around the rooflights. A slate and a half were employed on all abutments, and ridges and hips
were finished with a lead roll and wing detail. Although the church was built in 1824, it was damaged by bombing in 1940 and the roof was renewed during the
post-war rebuild, so the Welsh slates that were most recently replaced were likely to be about 75 years old, if they were installed new. www.welshslate.com
24 TC MAY 2024

Ventilation
ROOM TO BREATHE: HOW TO
CORRECTLY FIT ROOF TILE VENTS
Roof ventilation is a key factor to keep in mind for any home – especially when the overall
benefits are considered. Tile vents for roofing also provide added benefits by reducing the
risk of potentially harmful condensation and the negative impact this could have on the
occupants. Here, Nick King, Portfolio Manager at Klober, explains how installers can make
sure the effectiveness of roof tile vents can be maximised through proper installation.
In 2023, the UK Government released guidance
about addressing the mould and damp issues
in our country, with studies having estimated
the number of homes in England with damp and
mould ranged from 4% to 27% of homes, or
962,000 to 6.5 million. Damp and mould within
the home can produce allergens, irritants, mould
spores and other toxins that are harmful to health.
This is why it is critically important for anyone
installing loft insulation to make sure that the
insulation does not block the pathway of air
from the existing method of ventilation.
It is also vital that the benefits of roof
tile vents as a reliable method of
ventilation are widely recognised by
everyone operating in the housing
industry.
A growing demand
Industry professionals will be well-versed with
the basic function of a roof tile vent. They are
needed to help ventilate the roof space, prevent
mould and damp, and are often connected to fans
in bathrooms and ensuites to enable extraction
via a roof tile vent, adaptor, and flexible pipe.
They may also be installed on roofs to simply help
ventilate the loft space.
Understanding the scenarios in which roof tile
vents may be required is the first step in
acknowledging the important role that the product
has. Homeowners or landlords may notice mould
and damp near ceilings or in the loft, prompting
them to ask a roofer to retrofit a roof tile vent, or,
Left: Nick King, Portfolio Manager at Klober. Klober offers a range of roof ventilation solutions.
if necessary, vents. Secondly, if need to be installed and connected to a tile vent.
homeowners or landlords are installing
Even without an ensuite, transforming the loft
loft insulation, then contractors may need
space into a more frequented and used space will
to fit roof tile vents to ensure the loft is still well
mean condensation levels naturally increase.
ventilated, ensuring the airflow is not blocked.
Therefore, installers and contractors are advised
Other than dealing with mould and damp problems to consider all ventilation options, including the
or putting insulation in the loft to better retain heat, benefit of tile vents, and the positive impact on
more people are calling their home their office. damp and mould levels to homeowners. While
Plus, changing living trends like multigenerational roof tile vents can be retrofitted, contractors may
living means there is demand for more space in offer to install any additional product(s) at the
existing homes, and as a consequence, the need same time as working on the loft extension to
for roof tile vents is increasing.
minimise disruption to homeowners and
maximise efficiency.
The rise of working from home fuelled a boom in
the UK loft conversion market in 2023. Many Changing homeowner trends offers an opportunity
people wanted to make an investment in their for industry professionals to explain the benefits
home that would transform their existing loft of roof tile vents to a wider audience and
space into an additional functional room in the ultimately promote helpful solutions to reduce the
house. If a loft extension is being built with an commonplace problem of damp and mould in
ensuite, it’s likely that an extractor fan would homes across the UK.
26 TC MAY 2024

Roofing ventilation requirements
Regardless of the scenario, roof vents must meet
UK building regulation requirements. Market
leaders in the manufacturing of roof tile vents,
such as Klober, ensure products can achieve a
high level of ventilation, potentially without the
need for a breathable membrane. Klober
universal tile vents, for example, are perfect for
ventilating roof voids, by helping to reduce the
build-up of mould growth and structural damage
in the roof space, caused by damp and poorly
ventilated roofs.
It is equally important that components are
installed correctly, as mistakes here can
potentially lead to health risks for occupants and
damage to the property. After all, the benefits of
good products can only be realised if correct
installation is followed.
Fitting Universal or In Line roof tile vents
Individual product information will inform
contractors of the correct way to install their
chosen component, but these steps can be
followed as a guide to fitting Klober’s Universal or
In Line tile vents. Suitable for roof pitches as low
as 17.5°, depending on the profile of the roof tile,
both types of tile vent can be integrated with
most concrete interlocking tiles, with possibilities
for plain tiles as well.
Installation for Universal tile vents should
be approached as follows:
1. Position vent tile in desired location and mark
area of membrane to be cut.
2. Carefully cut the marked area to the bottom
and sides, fold back the flap and secure to tiling
batten above.
3. If using an adaptor for connection it is advised
to connect prior to installation.
4. Position vent tile, nail fix to upper batten and
secure the lower butyl strip on the skirt to a clean
dry and dust free tile below.
5. Continue tiling as normal then apply cap
ensuring this is firmly clipped into place.
“With such devastating health impacts, the
importance of well-ventilated living spaces is
critical”
Meanwhile, for Klober’s In Line tile vents,
these are the steps to follow:
1. First, determine the location of the tile roof
vents on the underlay. This must be in line with
the tile below.
2. Mark a 120mm x 180mm wide rectangle on the
underlay directly below the tile batten, where the
roof vent is to be fixed.
3. Make a star-shaped cut within the rectangle
from opposite corners and fold the four tabs
upwards. The top tab will then need to be secured
to the top side of the tiling batten.
4. Place and fix the vent tile in position, ensuring
the back spigot passes through the underlay. If
using an adaptor for connection, it is advised to
connect this prior to installation.
5. A subsequent visual check should be that the
fixing lug on the underside of the vent tile is located
under the left-hand interlock of the roof tile.
6. Proceed with roof tiling in the normal manner.
A common question that tends to arise is how
many roof tile vents do contractors need? If used
to provide high level ventilation in accordance
with building regulations, then one In Line tile
vent every two metres is required. However, this
will depend on the property in question and the
purpose of the tile vent. Plus, the type of roof tile
vents selected will depend on the roof type, such
as pitched roof ventilation.
There are also plenty of helpful step-by-step
videos that installers can follow when
approaching the fitting of a roof tile to ensure
effective ventilation can be achieved.
Roofing relevancy
Many homeowners, tenants, landlords and
roofing contractors will already be familiar with
the growing prevalence of, headline hitting stories
that focus on the problems associated with
mould and damp. With such devastating health
impacts, the importance of well-ventilated living
spaces is critical.
Industry professionals can answer many of the
questions posed by cautious consumers through
the explanation of roof tile vents’ purpose, as well
as ensuring they follow best practice when fitting
the components.
Find out more about Klober’s roof vent range
www.klober.co.uk/roof-ventilation/roofvents
MAY 2024 TC 27

Comment
PATHWAY TO PASSIVHAUS: LET’S
CLEAR THE MISUNDERSTANDING
By Allan Doris, Branch Manager at commercial roofing contractor BriggsAmasco.
The requirement for Passivhaus-level
performance in Scotland’s new-build
homes from January 2025 is a welcome
government initiative, as is the Passivhaus
standard across the UK. In 2022, UK government
figures revealed residential emissions accounted
for 17% of the country’s CO 2 output, an issue
that must be addressed if our net-zero ambition
is to be met. But are stakeholders truly ‘across
the detail’ when it comes to delivering
Passivhaus standard for homes, schools, colleges
and roofing projects throughout the commercial
and industrial sector? If not, could we be storing
up a host of costly retrofit issues in the drive to
achieve optimal airtightness.
There are plenty of positives to be taken from the
Scottish Government’s introduction of Passivhaus
legislation. It is claimed that constructing to the
standard reduces a building’s heating demand by
90%, whilst the improved interior air temperature
consistency enhances year-round occupant
comfort and wellbeing. But do we have the
necessary technology, tools, materials and
understanding to deliver the Passivhaus building
tolerance levels required? From my experience
thus far, the answer to that question, is no.
Tolerance discrepancy
There are major obstacles to achieving
construction tolerances being considered by
Passivhaus consultants. For example, for a recent
roofing project involving BriggsAmasco, the
advocated machine-manufactured insulation had
an either way 5mm tolerance. This was despite
Passivhaus consultants stipulating a 1.5mm
tolerance. This is not an uncommon discrepancy.
But rather than engaging with project
stakeholders to devise a solution to counteract
the 3mm tolerance shortfall, the burden of
Allan Doris
responsibility is handed to the main contractor. In
the case of the project involving BriggsAmasco,
Passivhaus consultants floated the idea of craft
trade tools being used as part of an onsite cutting
process to achieve the 1.5mm tolerance, but with
the best will in the world, that just wasn’t
possible.
As stated, there are many reasons to welcome
the coming of new-build Passivhaus compliance,
but currently the technology, tools and
equipment are not available to make it happen.
Therefore, I believe the time is ripe to create an
open forum for building stakeholders to convince
Passivhaus consultants of the need for greater
consideration in respect of building material
manufacturing tolerances. This is also important
to debating whether craft trade tools regularly
used onsite are capable of meeting the
“In my opinion, the only
way to Passivhaus
success is through
extremely close
collaboration between all
parties from the early
project stages”
standards described or set out by the
Passivhaus Institute.
Collaboration
In my opinion, the only way to Passivhaus
success is through extremely close collaboration
between all parties from the early project stages.
Although the Passivhaus standards are well
written and informative, more focus is required
on the practicality of meeting them on site. When
additional products are required such as
expanding foams – to fill gaps between insulation
boards – the standards contain a lack of
approved products and solutions that have been
tested in Passivhaus applications for longevity
and durability.
Facing challenges
As a proactive contractor, we are looking at
trialling different materials to support the
Passivhaus project requiring 1.5mm tolerances.
But such research is time-consuming and costly,
involving materials that our installers may not be
familiar with. As a BriggsAmasco Branch
Manager, I like to be aware of the technical
challenges my site teams are likely to face. But in
order to develop solutions to meet Passivhaus
compliance, contractors such as ourselves are
28 TC MAY 2024

sailing into unchartered territory.
Again, the issue would not be as acute if
Passivhaus consultants, aware of the tight
tolerances we were having to work with,
supported us by highlighting a range of materials
and ancillary products that could help achieve
compliance. However, the onus remains with the
specialist contractor.
Demonstrating concerns
In terms of additional proactive measures taken
to highlight our concerns regarding building
tolerance compliance, in August we invited
Passivhaus Trust representatives to a
demonstration day. It was held at
BriggsAmasco’s regional Cumbernauld offices
and involved our technical teams creating a builtup
roofing system within a controlled warehouse
environment. Despite there being no exposure to
external elements, foot traffic or building
movements, we were unable to achieve 1.5mm
tolerance compliance. A representative from a
“The time is ripe to create an open forum for
building stakeholders to convince Passivhaus
consultants of the need for greater
consideration in respect of building material
manufacturing tolerances”
leading roofing membrane manufacturer was also
in attendance. We have supplied Passivhaus
consultants with our optimal tolerance outcomes.
Realistic ambitions
Until technology progresses to significantly
improve onsite cutting efficiencies, I believe
consultants must be more realistic with their
desired outcomes for Passivhaus compliance.
Many variables provide a barrier to even the most
skilled operators achieving 1.5mm tolerances:
human error, manufacturing tolerances, materials
being damaged en route to a roof. Hence, the
level of cross-party cooperation and product
evolution is yet to keep pace with Passivhaus
ambitions.
The challenge now for building stakeholders is to
make Passivhaus compliance achievable,
regardless of how tight the required tolerances.
It’s why I’m imploring all interested parties from
designers, manufacturers and contractors
through to structural engineers and Passivhaus
consultants to bring their thoughts, ideas and
concerns to the table. It will be crucial to the UK’s
homes, schools and roofing projects, commercial
and industrial, being built with airtight efficiency.
Contact BriggsAmasco
briggsamasco.co.uk
For further r
inform
ation
or a hire quotation call
01858 412 100
Email: sales@cookerhire.com
www.cookerhire.com

Total Talk: Pete Hollingworth
“THE MARKET HERE IS VERY READY
FOR THIS PRODUCT...”
Total Contractor puts the questions to Pete Hollingworth, who was recently appointed
Commercial Manager - Europe on behalf of GP (Georgia-Pacific) Gypsum LLC, responsible
for developing the customer and technical support for DensDeck Roof Boards. We discuss
Pete’s plans for the role, why he feels the flat roofing sector innovates faster than most
sectors in construction, and how he plans to make the name DensDeck synonymous with
the application of roof boards...
In March 2023, Pete Hollingworth took up the role of Commercial Manager - Europe on behalf of GP
(Georgia-Pacific) Gypsum LLC and is now responsible for developing the customer and technical
support for DensDeck Roof Boards.
Pete brings a wealth of strategic and sector experience to Georgia-Pacific. He previously worked at Sika
as Business Unit Manager for Roofing & Flooring. Prior to that, he held a variety of strategic and sales
roles including Head of Business Support at Salesforce.com for the EMEA region. Pete joins from
Aggregate Industries where he was Managing Director for Concrete Products.
David Neal, President of GP Gypsum LLC said: “This is an exciting time for Georgia-Pacific as we
expand into the European market with our premium line of DensDeck Roof Board products. With Pete’s
efforts, we will enhance local representation and technical support, ensuring exceptional customer
service. Our aim is to become the preferred choice for contractors and architects by prioritising quality,
innovation, and solidifying our position as a preferred solution in Europe and beyond.”
We caught up with Pete to find out more about his new role, and what he hopes to achieve…
Above: Pete Hollingworth, Commercial Manager - Europe on
behalf of GP (Georgia-Pacific) Gypsum LLC, is responsible for
developing customer and technical support for DensDeck
Roof Boards.
TC: So Pete, what brings you back to the
flat roof sector?
PH: Two things really. The people in it, and the
enjoyment that I get from working in it.
Working with the people in the industry is a huge
part of the enjoyment; that and the innovation
that the flat roofing sector offers.
In terms of innovation, I feel that the flat roofing
sector moves at a faster pace than some of the
other areas of construction. There are always new
organisations and people who are developing new
ideas and working to improve how we do things.
There’s a real focus on workmanship and
tradition, and people take great pride in what they
do. You only need to look at the industry awards
to see that, and social media posts where
“As an industry, we
need to ensure that
roofs are designed to
mitigate that risk [of
fire] as much as
possible”
contractors post their work.
We’re already a member of the Single Ply Roofing
Association (SPRA) and I’m keen to work with
other industry bodies. The LRWA, for example, are
doing fantastic things for the industry. I’m also a
Fellow of the Institute of Roofing (IoR) and am
looking forward to working again with some
former colleagues.
Essentially, the flat roofing industry has a good
solid base of governance, standards and ethics
that everyone wants to uphold, while also
focusing on how the industry can improve and
innovate.
TC: What excites you about DensDeck Roof
Board?
PH: DensDeck Roof Board is a well established
and highly regarded product that has been adding
to the resiliency of flat roofs in America and
Canada for a long time. We’ve already done a lot
of projects in Europe, and I think we’re at the
point where the product will start to be much
more widely used.
I think the timing is right and the market here is
very ready for this product, there is a real
requirement for it.
Continued on page 32
30 TC MAY 2024

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Total Talk: Pete Hollingworth
Continued from page 30
Three factors are driving this. Firstly, stricter
legislation and greater awareness of fire risk and
how, as an industry, we need to ensure that roofs
are designed to mitigate that risk as much as
possible.
Secondly, how we use flat roofs is changing;
energy efficiency regulations have significantly
increased the use of photovoltaic panels. This, in
turn, increases the loading placed on the roof
and the foot traffic required for maintenance,
both of which can damage insulation and the
waterproof membrane and also, unfortunately,
the fire risk.
And that’s where DensDeck Roof Board comes in.
It will add to the resiliency of any flat roof buildup.
Not only does it help to mitigate the effect of
fire from PV panels, but it also improves acoustic
performance, provides additional dimensional
stability to the roof system, and improves the
resiliency of the waterproofing membrane against
damage.
Lastly and perhaps most importantly, the product
is available. We have stock on the ground in
mainland Europe, so we can meet the demand of
our customers and get it on site in a matter of
days.
In my opinion, every roof is mission critical and
deserves to have DensDeck Roof Board as part of
the system.
TC: What will you bring to the role from
your previous positions?
PH: Commercial energy and drive. In my head, I
tend to think of myself as a salesperson, but the
more recent roles I’ve had are about setting
strategy and market direction. I’ve run
businesses, built capability and delivered
projects.
This has given me the ability to understand
what’s needed on the ground and look at the
bigger picture to develop the market strategy.
That’s what I’ll be doing on behalf of Georgia-
Pacific; building the capability to support the
growth of DensDeck Roof Board.
Above: DensDeck Roof Boards were used to increase resiliency of the flat roof at Hamad International Airport.
“Standards governing
how the building
envelope performs are
getting stricter so the
industry needs to find
ways to improve the
resiliency of flat roofs”
We know that a combination of time differences,
language barriers and local regulations and
standards can create additional hurdles for our
customers. So over the next few months, I’ll be
looking to add two people to the commercial team
locally in Germany and Spain, and one to the
technical team to support customers on behalf of
Georgia-Pacific.
We are increasing the level of support that
customers need right now on a local level, so the
product can flourish in the UK and European
markets.
TC: What do you want to achieve as
Commercial Manager - Europe?
PH: In America, a large proportion of roofs that
have additional performance requirements –
whether that’s enhanced fire resistance,
improved acoustics, or more durability – use a
DensDeck Roof Board to achieve that
performance. My goal is to replicate that in the
UK and Europe.
I want ours to be the name that’s synonymous
with the application, so when someone says they
need a roof board or a cover board, I want them
to say they need DensDeck.
It might sound ambitious, but I think it’s
absolutely achievable. Standards governing how
the building envelope performs are getting stricter
so the industry needs to find ways to improve the
resiliency of flat roofs. Installing a DensDeck Roof
Board gives all types of flat roof build-ups the
enhanced performance needed to deliver that
resiliency. In my opinion, it would be difficult to
justify not using one.
I see our task as supporting waterproofing system
manufacturers and roofing contractors while
bringing the benefits of DensDeck Roof Board to
the specifiers, be they architectural, client or
contractor.
I get excited about meeting people and getting
involved in projects. I’ve missed that and I’m
excited to get back to it.
Find out more about the DensDeck Roof Board
densdeck.buildgp.com
Georgia-Pacific Building Products
32 TC MAY 2024

Roofing Updates
For further info on all these updates and more, visit www.total-contractor.co.uk
EJOT COLORFAST CHOSEN FOR KINGSPAN FACTORY
More than 120,000 EJOT Colorfast self-drilling
fasteners have helped Kingspan to create a thermally
superior, visually appealing building envelope for its
first purpose-built manufacturing plant in South East
Asia.
The 16,000 sq. m factory at Phu My Town in Ba Ria-Vung
Tau Province, Vietnam, will enable Kingspan to grow its
presence in the wider Asian region by providing a state-of-the-art plant to
manufacture its market-leading Quadcore and mineral fibre insulated
panels. It marks a strategically important step in the development of the
Kingspan Group, helping it to unlock the potential of a new and expanding
market with a total investment of more than £21 million, and this is reflected
in the building’s very high specification.
Installed by main contractor TUAN LE Construction, the building envelope
features a total roof area of 14,500 sq. m, formed using Kingspan Quadcore
KS1000RW insulated panels and KS1000DLTR (Day-Lite Trapezoidal
Rooflight) polycarbonate rooflights.
All of the 120,000+ fasteners used to create the envelope were EJOT
fasteners, mainly Colorfast (CF19 JT3 D6H) which feature a 19mm
aluminium/EPDM vulcanised sealing washer and utilise
EJOT’s JT3 bi-metallic self-drilling screw. These were
coloured in White for the main roof fix and Poppy Red
with storm washers for the rooflight detail. EJOfast
fasteners with a 15mm washer (CF15 JF3 2 5.5 x 25)
were used for the side and end laps, while CF19 JT6 2H
6.3 x 30/10 secured the rooflight laps.
The reasons for their specification, however, went far beyond the simple
functional objective to attach the roof to a structure. Colorfast was able to
make a positive contribution to the long term performance of the building
envelope and, hence, the sustainability of the factory as a whole.
As an FM Approved fastener, Colorfast has been independently assessed and
its performance verified under a globally-recognised certification scheme.
The stringent testing undertaken by FM Approvals considers fasteners within
a complete assembly, rather than in isolation, which was extremely
important to the architects on this project.
They sought assurance that the products would deliver on their promise to
comfortably match the design life of the envelope’s panels and minimise
thermal transfer once the building was operational. www.ejot.co.uk
TWO TO LOOK OUT FOR FROM SIKA...
Sika’s Roofing Division is proud to announce its
selection as finalists in two categories of the
NFRC UK Roofing Awards 2024.
challenges such as tight workspaces, close proximity to
other trades and the aesthetic requirements needed to
keep the building in line with its impressive history.
The company has been recognised for its impressive
contributions in the technology fields of Bituminous Hot
Applied Liquid Waterproofing and Cold Applied Liquid
Waterproofing. Judges were impressed by two exemplary Winners announced on 10th May 2024.
For the Cold Applied Liquid Waterproofing category, Sika
submitted its large-scale residential project, Burnt Mills
in Harlow, Essex. Once home to a series of garages and
workshops, it has been redeveloped into 173 homes
projects that showcase the company’s commitment to innovation, quality,
and excellence in roofing solutions.
over 15 storeys, forming one of the tallest buildings in Harlow. Roofing
contractors, Contour Roofing used Sikalastic 625N PU Liquid in Grey for the
project. The product’s exceptional quality and ease of installation helped
In the Bituminous Hot Applied Liquid Waterproofing category, Sika has been
Contour Roofing overcome numerous obstacles, such as roof penetrations, to
shortlisted for its involvement on a project at Rhodes House, part of the
allow for services, and roof plant housing.
University of Oxford and home to the scholarship team. As part of a large
refurbishment plan, large subterranean spaces were excavated beneath the
building to create lecture theatres and new pavilions were created. The
project required large volumes of concrete to be waterproofed and installed
at zero-degree falls. Roofing contractor, Fenland Flat Roofing successfully
installed a high penetration primer, before the SikaShield hot melt structural
waterproofing system. Fenland Flat Roofing was able to overcome multiple
Mark Gatrell, Business Unit Manager at Sika, explained: “We are delighted to
be shortlisted for two NFRC UK Roofing Awards. This acknowledgement
reflects our ongoing commitment to delivering innovative and high-quality
roofing solutions, and we are proud of our team’s dedication and expertise,
working alongside high quality roofing contractors, which has directly
contributed to us reaching this achievement.” www.sika.co.uk/roofing
34 TC MAY 2024

Article Metal Cladding and Roofs
WIND LOADINGS – WHAT ARE THEY
AND WHY IS IT SO IMPORTANT TO
GET THE CALCULATIONS RIGHT?
Clare Fenton, Chair of the MCRMA, explains why building envelopes must be designed to
resist forces resulting from strong winds, and highlights how the association’s new CPDapproved
guidance will support designers and installers to achieve higher standards.
Environmental conditions such as wind, and
changing environment conditions such as
gusting wind, can have a dramatic
influence on the structure and roofing and
cladding of the building envelope. It must be
noted that the design calculations for the
structure, and those for the roofing and cladding
envelope are completely different, and must not
be regarded as the same or interchangeable. It
largely comes down to the difference in pressure
that can develop on a windy day between the
exterior and the interior spaces, and the strong
forces which result.
When the wind blows on a building, the change in
wind speed as the air negotiates the obstruction
in its path (the building) may result in either an
increase or a decrease in pressure. When
combined with changes to the internal air
pressure, the result is either a net positive
pressure (on windward facing walls and the
windward slopes of steep roofs), or a net suction
(on leeward facing walls, on walls parallel to the
direction of the wind and on roofs generally).
The wind pressure and suction can have other
effects too, chiefly causing deflection in the wall
and roof cladding which may, in extreme cases,
cause structural failure of the roofing and
cladding profile. The strength of these forces is
such that wind suction may also result in failure
of the fasteners holding the panels to the building
structure if not properly specified.
Clare Fenton is Chair of the
Metal Cladding and Roofing
Manufacturers Association
(MCRMA).
“Metal building envelopes need to be designed in
a way that takes into account the strong loads
resulting from the pressure differential caused
by strong winds – which we know as wind
loadings”
strong loads resulting from the pressure
differential caused by strong winds – which we
know as wind loadings. However, numerous
factors affect the wind load values, which means
it is impossible to arrive at a single value which
can be used for the design of all buildings.
variation in wind speed can be additionally
affected by a building’s location and its geometry.
This means several factors are most influential
on wind loadings:
• Location – some parts of the country are
windier than others
Hence, why metal building envelopes need to be
designed in a way that takes into account the
Common factors affecting wind loadings
The UK’s weather is notoriously changeable, but
• Altitude – the higher the site, the greater the
wind speed
36 TC MAY 2024

• Distance to sea – locations closer to the sea
experience greater wind speeds
• Town or country – in built-up areas, buildings
may provide shelter from the wind
• Topography – topographical features can result
in increased wind speed
• Wind direction – the strongest winds generally
blow from the south west
• Building height – taller buildings are exposed to
stronger winds
Given these factors, the wind loading is different
for every site and every building, which is why it
has to be calculated for each and every project
and each and every area of any given building.
But this should not be confused with the area
imposed loading on roofs and walls – that is a
completely different calculation which should also
be carried out at the design stage.
How to get the wind load
calculations right
It is critically important to ensure the wind load
calculations are correct for every building. Failure
to do so may result in buildings being unsafe in
some cases, and uneconomic in others.
This is one of the reasons why the MCRMA has
published a new guidance document called GD41
‘Wind Loading for Metal Roofing & Cladding -
Protocol for Calculations’. It is designed to give
anyone involved in the design of a metal façade a
basic understanding of what is involved in the
calculations process.
The guidance document was written by David Roy
of MCRMA member company Roofconsult, and it
is also approved as a CPD. David said: “As an
independent consultant I recognise the
importance of wind load calculations in the
selection of systems and fixing for roofing and
cladding specifications.”
GD41 provides guidance when undertaking a
wind load calculation and also assists with the
interpretation of results. It introduces the industry
standards relating to wind load calculations and
Windload diagram
what values make up the calculation itself,
qp*(Cpe-Cpi).
Given the complexity of wind loads, it is standard
practice to use a dedicated software program.
There are a number of excellent programs
available, but it is important to note that
whichever one is used, it must comply with the
requirements of BS EN 1991-1-
4:2005+A1:2010, and supplemented with the
UK National Annex (NA) incorporating National
Amendment A1 dated January 2011.
Wind load calculation software programs require
input data that falls into the following categories:
• Location
• Roof perimeter zones
• Adjacent structures
• Roof type
• Building height and parapet walls
Assuming the correct data is provided in relation
to these categories, the software will provide the
wind loadings that need to be accommodated by
the design. This will inform the building
envelope’s design and specification, helping to
determine the most appropriate roofing and
cladding systems and products, as well as their
installation methodology, including which types of
fasteners to use and how many.
It is here where the wind load data is vitally
important. The capacity of the sheeting and the
performance required of the fasteners, including
their pull-out and/or pull-over strengths, as well
as their quantity and installation pattern on each
area of the roofing and cladding can only be
“Numerous factors
affect the wind load
values, which means it
is impossible to arrive
at a single value which
can be used for the
design of all buildings”
developed with confidence if the wind load forces
are known. With several of the industry’s leading
fastener manufacturers within the MCRMA’s
membership, this is an area where the
association’s support can be particularly
valuable, as they can advise further.
It is also important to keep abreast of software
updates and capabilities as developments in this
area are enabling the wind load calculations
process to be more streamlined and accurate. For
example, the SCI (Steel Construction Institute)
has recently launched an updated program called
SCIPHYR (pronounced ‘zephyr’), a cloud-based
solution which replaces the BREVe program with
added tools and functionality including an up to
date location and altitude database.
Advances like this from the SCI are extremely
beneficial in terms of delivering robust metal
building envelopes that stand the test of time. But
remember, wind load calculations are only one
factor in the design and installation process that
requires focus and attention to detail throughout.
Guidance document GD41 is available to
download on the MCRMA website along with
numerous other resources designed to support
everyone in the metal building envelope supply
chain. Specific technical advice can also be
requested from any of the 40+ MCRMA member
companies to reduce risk and achieve the highest
quality results.
Contact MCRMA
www.mcrma.co.uk
mcrma.co.uk/wind-loadings-guidance/
MAY 2024 TC 37

Product Focus
FOCUS ON THERMAL PERFORMANCE
The team at Don & Low discuss the company’s Reflectashield and VapourTX Thermo
solutions...
In the dynamic backdrop of construction, every
element counts toward energy efficiency and
structural integrity. Therefore, choosing the
right materials is paramount. Where innovation
meets necessity, Reflectashield and VapourTX
Thermo emerge as leaders of progress.
Engineered to perform and built to last, these
original solutions represent the cornerstone of
modern construction, where performance,
durability and efficiency converge to shape a
sustainable future.
Manufactured in the UK, Don & Low’s
Reflectashield and VapourTX Thermo are two
innovative solutions engineered to elevate thermal
performance and ensure lasting durability in
diverse building applications. Both can be utilized
to enhance the overall U-value or be integrated as
a strategic component in project cost management
to minimize thickness or type of insulation.
Above: Reflectashield from Don & Low.
Reflectashield is a leading example of precision
engineering and consistent performance. Crafted
with a highly reflective breather membrane
featuring an aluminium foil lamination,
Reflectashield boasts a low emissivity ideal for
unventilated airspace scenarios. This versatile
membrane finds its place in various construction
methods, including timber frame, steel frame and
modular buildups.
Beyond its reflective proficiency, Reflectashield
offers a host of benefits that redefine
conventional standards. Acting as a temporary
weather-resistant covering until the final façade
installation, it provides essential protection during
construction phases. At the same time, its low
vapour resistance aligns with BS 5250
regulations, mitigating the risk of harmful
condensation buildup within the frame.
Key Benefits of Reflectashield:
• Excellent Thermal Resistance of 0.81m 2 K/W
• Provides a weather-resistant covering until the
final façade has been installed
• Can be left exposed for 6-12 weeks by STA
Advice Note 18
• Aids in complying with BS 5250
• Low vapour resistance aids in mitigating the risk
of interstitial condensation
• Coated to ensure aluminium foil is resistant to
corrosion and damage
• Durable product with high nail tear and tensile
properties
• Independently 3rd party-certified by BM TRADA to
ensure product performance
On the other end of the spectrum lies VapourTX
Thermo, an advanced vapour control layer designed
to optimize thermal efficiency across floors, walls
and ceilings. Boasting a highly reflective aluminum
foil lamination, VapourTX Thermo excels in creating
a low emissivity environment when faced with
unventilated airspace.
VapourTX Thermo's application extends across a
wide array of construction methods, from timber
and steel frames to modular and masonry buildups.
Positioned on the warm side of the insulation, this
reflective marvel acts as an airtight barrier,
reducing the risk of condensation buildup and
ensuring compliance with BS 5250 standards.
Above: VapourTX Thermo.
Key Benefits of VapourTX Thermo:
• Excellent Thermal Resistance 0.79m 2 K/W
• Provides a complete air and vapour-tight
barrier due to high air and vapour resistance
• It can be used to comply with BS 5250 and Part L
• Suitable for use in PassivHaus and Net Zero
Carbon projects
• Coated to ensure aluminium foil is resistant to
corrosion and damage
• Durable product with high nail tear and tensile
properties
• Independently 3rd party-certified by BM TRADA
to ensure product performance
Ensuring easy identification, Reflectashield
comes with distinctive blue branding on the cold
side of the insulation, while VapourTX Thermo is
supplied with red branding on the warm side of
the insulation. Both membranes can be used for
optimal thermal efficiency. Additionally, Don &
Low’s Reflective Tape is a reliable repair solution
in case of membrane damage during exposure.
With Don & Low’s firm commitment to quality and
excellence, the journey to superior thermal
performance begins here.
Contact Don & Low
0808 169 4444
https://www.donlow.co.uk/
Email: membranes@donlow.co.uk
38 TC MAY 2024

Article Advertorial: heading Cedral
THIS IS HOW CEDRAL CAN
HELP YOUR BUSINESS...
With over 100 years’ experience in the
industry, Cedral’s premium quality fibre
cement facades and slates provide the
perfect blend of durability and good looks.
Plus, Cedral provides a seamless customer
journey from start to finish, from visualisation
tools to product calculators, free samples to oncall
expertise.
And Cedral’s certified facade installer scheme
provides training and support, lists your business
on the Cedral website and gives you access to
customer quote requests. Apply to be a Cedral
Select facade installer on the website in the
contact details.
The benefits of Cedral: facades
Long life expectancy: Fibre cement is a strong and
versatile material with a minimum life expectancy
of 50 years.
Easy installation: Our all-in-one cladding
solutions include easy-cut planks, colourmatched
trims and bespoke accessories.
Increased energy efficiency: The rainscreen
cladding makes it easier for the building to be
cooler during summer and warmer during winter,
favouring both thermal comfort and energy
saving.
Improved thermal and acoustic insulation:
Combining an insulation layer with the rainscreen
cladding system can help improve both the
thermal and acoustic insulation of the building.
Reduced condensation and humidity: The
ventilated air cavity improves the durability of the
exterior cladding material by keeping it dry. The
facade’s lifetime is even longer when using a
durable and resistant material like fibre cement.
Discover the beauty of Cedral facades:
www.cedral.world/en-gb/cladding/
The benefits of Cedral: roofs
Long life expectancy: Cedral fibre cement slates
are the among strongest in the market, with a
minimum life expectancy of 50 years.
Easy installation: Cedral slates are lightweight
and easy to work with and can be placed on lighter
roof structures without the need to strengthen them,
making them an ideal option for renovations. Our
dry fitting process eliminates the need for mortar.
Essential accessories: A portfolio of products
includes a range of fittings and accessories for
pitched roof ventilation, verges, ridges and hips
and general fixings. Find out more:
www.cedral.world/en-gb/-/roofs-accessories/
Read more about Cedral roofs:
www.cedral.world/en-gb/roofing/
In addition, Cedral facades and slates offer:
Low maintenance: Manufactured to withstand
nature’s harshest conditions, fibre cement
doesn’t rot, rust, warp or crack and is fire, insect,
bacteria and algae resistant.
Sustainability: At Cedral we want to build a more
durable world and bring sustainability to life. We
focus our business towards building a more
sustainable world for those around us. Read more:
www.cedral.world/en-gb/sustainability
Excellent fire performance classification:
Cedral has a long-standing commitment to
ensuring our materials comprehensively meet the
fire performance classification A2-s1,d0 to EN
13501-1:2018.
Choose Cedral for wide ranging style
choices
• Cedral Collections: Cedral facades are
available in 2 finishes across 21 shades, curated
into four striking colour collections – Design,
Expressive, Natural and Classic – bang on trend
and created for contemporary lifestyles.
• Click and Lap designs: Cedral Lap is specially
designed so the planks are overlapped when
installed to create a traditional clapboard aesthetic
while Cedral Click is a tongue and groove material
which creates a modern, flush fitting facade.
• Cedral slates: Four eye-catching designs –
Rivendale, Birkdale, Thrutone Textured and
Thrutone Smooth – offer a range of slates that are
perfect as both a roofing material and a unique
option to create a full envelope with the facade.
•Mix and match: Cedral facades and slates
combine harmoniously with other materials such
as wood, brick or plaster; play with colour and
light and dark shades to create stunning
installation patterns.
Supporting your business
Cedral offers dedicated customer support from
free product samples to how-to technical guides
and videos, a visualisation tool, product
calculator and stockist locator guide for
cladding and roofs.
Talk to Cedral
+44 (0) 1283 501 555
www.cedral.world/en-gb
Email: infouk@etexgroup.com
MAY 2024 TC 39

Cladding & Facades Updates
TRIPLE BENEFITS FOR COASTAL SELF-BUILD
The threefold combination of the Wraptite,
Wraptherm and Reflectatherm airtightness
and vapour barrier systems from A. Proctor
Group has helped to provide enhanced
thermal performance and protection for a
sea-facing SIPS construction self-build
property on the west coast of Scotland.
The self-build project managed by Phil and
Lynn Dickinson is designed by architects Allan
Corfield Architects, and is located in Craobh
Haven, a unique location that combines the
beauty of an Atlantic Rainforest with stunning
sea views. Craobh Haven is a small purposebuilt
village and sailing port on the west coast
of Argyll and Bute, Scotland. The main
contractor for the project is Rochead Irvine
Construction.
The key requirements for the project included a
Fabric First design, SIPS construction, and
breathability, plus protection from the Argyll coast
exposed site. In addition, the client design sought
to achieve excellent insulation values, and highly
efficient thermal airtight performance.
Wraptite is installed as an external air barrier and
alternative to a traditional standard breather
membrane. Wraptite is the only self-adhering
vapour-permeable air barrier certified by the BBA
and combines the essential properties of vapour
permeability and airtightness in one self-adhering
membrane. The self-adhered nature of Wraptite
and its high level of water resistance and
simplified detailing made it an ideal choice.
The self-adhering qualities of Wraptite also
enables a simple and fast installation process. It
has excellent weather protection and watertightness
properties also. The membrane can be
installed directly to walls and openings with
speed and efficiency, enabling internal fit-out to
begin more rapidly than in traditional forms of
construction.
Alongside the Wraptite membrane, the thermal
and airtightness performance of Wraptherm is
included in the build. Wraptherm is a highperformance
membrane composite that is
self-adhesive and consists of a 10mm
Spacetherm aerogel insulation blanket bonded
to the face of Wraptite.
www.proctorgroup.com
EJOT COLORFAST DELIVERS FOR NEW DPD HUB
EJOT Colorfast fasteners have been used in the
creation of the metal building envelope for a
new 60,000 sq. ft ‘build to suit’ parcel hub near
Wolverhampton, which is designed to be
amongst the UK’s most sustainable buildings of
its kind.
Developed by Trebor Developments and Schroders
Capital UK Real Estate Fund (SCREF), the new
facility at Revolution Park will be a regional base for
parcel delivery company DPD, who have agreed a
25-year lease. The 10.5 acre distribution facility is
the latest addition to this highly successful business
park with a design featuring two distinctive pods –
one being a single storey unit housing staff facilities,
and the other a two-storey office block.
Designed by UMC Architects and constructed by
main contractor A&H Construction, the new
‘superhub’ for DPD sets the standard for industrial
and commercial buildings in the net zero carbon
economy. Built to the BREEAM ‘Excellent’ standard
and achieving an EPC A+ rating, the facility has its
own on-site renewable energy technology, EV
charging points, high performance glazing,
sustainable lighting, reduced water flow rates and
biodiversity initiatives.
Installed by Halesowen-based UK Industrial Roof &
Cladding, the building envelope is also designed
with carbon savings in mind to an extremely well
insulated standard, and it is here where 93,000
EJOT Colorfast over-moulded fasteners made an
important contribution. The architect specified the
TATA Steel Trisobuild built-up system for the roof
and walls, with additional walls using Trimpanel
Micro Rib, to meet the envelope’s target
performance goals which had to be consistent with
the requirements of the BREEAM ‘Excellent’ rating.
Using a mix of EJOT Colorfast CF15 and CF19 JT3-
3-5.5 X 25 self-drilling fasteners in conjunction with
the TATA Steel system meant that a high level of
thermal insulation could be assured for a variety of
reasons. Firstly, the design of Colorfast’s head and
washer ensures that a consistent seal can be
provided above the sheet to achieve a level of
airtightness that may not be possible with other
types of colour-matched fasteners, and it also
minimises the risk of water ingress.
Secondly, the materials used in the manufacture of
Colorfast mean the level of heat transfer from
outside to in and vice versa is limited.
www.ejot.co.uk
40 TC MAY 2024

For further info on all these updates and more, visit www.total-contractor.co.uk
NEW METALLICS RANGE FROM JAMES HARDIE
James Hardie, a leader in the manufacture
of high-performance fibre cement and fibre
gypsum building solutions, has launched a
metallics range in the UK, in response to
market demand for bolder, more creative
design options.
The new Hardie Architectural Panel Metallics
range comes in gold, copper, gunmetal, silver,
steel and bronze, and is available for all 8mm
and 11mm Hardie Panel products.
Created by the company’s in-house
expert paint technicians, working in
collaboration with its R&D team, the
formula, which took more than four years
to develop, prevents against UV, fade, rot
and is fully weather resistant.
Lee Bucknall, UK Country Manager at James
Hardie, commented: “At James Hardie, we
know that a property’s exterior is an important
way to make a
design
statement.
These innovative metallic shades, the first to the
UK market, form a key part of our portfolio of
patterned profiles, surface finishes and colours
for use in residential, commercial and industrial
applications. Our strong culture of innovation
and continuous improvement means that we
listen to our customers and focus our
development on meeting their needs, and
believe this new range will inspire architects,
builders, and homeowners.”
www.jameshardie.co.uk
VIVALDA CONTINUES GROWTH
Vivalda Group, the national cladding
specialist, says it has signalled its confidence
in the UK facades market with a trio of new
senior roles.
While Wes Hague has joined the business as Group
Commercial Director, Adam Sumner has returned to
Vivalda as Specification Manager. Further
supporting the group’s nationwide sales capability,
former Manchester Branch Manager Jamie O’Brien
has been promoted to Key Account Manager for the
North.
Fulfilling the new role of Group Commercial Director,
Vivalda says Wes will focus primarily on new
product development within the business, which
has recently launched MetSkin, its own fully tested,
solid aluminium façade system. The manufacturer
and distributor says Adam Sumner’s role adds to
the company’s nationwide sales capabilities,
providing technical product advice to specifiers and
architects.
Building on the success of the model pioneered in
the south, Jamie O’Brien has been appointed Key
Account Manager covering cities such as
Manchester, Liverpool and Leeds. The company
says he will work in close collaboration with Michael
Brookman, Vivalda’s Key Account Director for the
South.
As Group Commercial Director, Wes also has
responsibility for the supplier base across the group,
which includes Vivalda, BBS Facades, Pura
Facades, MSP Façade Solutions and Prism Powder
Coating. He said: “I’ve built my career by forging
long-term partnerships with suppliers while also
encouraging internal collaboration, which helps us
to focus on the needs of our customers. Vivalda is
already a great business with a hugely positive
culture, and I am convinced I can bring some of the
lessons I’ve learnt from other sectors to build on
Adam Sumner (above left) has returned to Vivalda as
Specification Manager after two and a half years with
Kingspan Facades, whilst Wes Hague (above, right) was
previously Head of Business Efficiency at Harlow Timber
Group and is now Group Commercial Director at Vivalda.
these solid foundations.”
Vivalda says Adam Sumner has been brought
onboard to help architects and specifiers gain a
better understanding of the various cladding
materials that are on the market. He said: “Whether
it’s solid metal, terracotta or GRC cladding, the
choices facing specifiers can be bewildering given
the sheer variety of facades currently available. My
job is to help specifiers make informed choices
when considering various rainscreen cladding
materials.” www.vivalda.co.uk
MAY 2024 TC 41

Comment
HOW PRACTICAL IS A NET ZERO
APPROACH TO NEW BUILDINGS?
By Simon Storer, Chief Executive, Insulation Manufacturers Association.
The UK government has committed to
achieving net zero CO 2 emissions by 2050,
but with buildings generating in excess of
30% of all greenhouse gas emissions, this
presents a major hurdle on the road to
decarbonisation. Meeting this ambitious and
legally binding target demands substantial
changes within the construction sector if this net
zero figure is to be achieved, and will require a
determined approach for new residential and
commercial buildings. Added focus is needed on
key challenges throughout the construction
process, such as design, construction materials
and their installation, detailing, building
performance as built, better compliance and
inspection, as well as honesty about the cost of
more complex buildings and how this should be
financed.
Contractors must lead the way by championing
‘fabric first’ approaches and letting more
“The net zero
approach to new
buildings is an
essential and
ambitious goal
for the UK to help
combat climate
change”
Simon Storer
buildings do the work, as this will be a crucial
step towards meeting net zero objectives and
achieving energy efficiency standards.
Tapping into renewable energy
A fundamental aspect of net zero buildings is the
use of renewable energy sources such as solar
panels and wind turbines, but challenges arise
when it comes to providing sufficient energy to
meet the demands of a building. By optimising
energy efficiency and reducing the
amount of energy used, the burden
on the grid as well as on renewable
energy sources can be reduced.
Insulation and fabric first
Insulation plays a vital role in
enhancing the energy efficiency of
buildings, reducing heat loss in
winter and heat gain in summer.
Polyisocyanurate (PIR) and
polyurethane (PUR) insulation are widely
recognised for their excellent thermal
performance. These materials have low thermal
conductivity, allowing for thinner insulation layers
while maintaining high levels of insulation, which
can be crucial in achieving net zero standards in
the building envelope.
A fabric first approach, focused on highperformance
insulation, is a common-sense
approach to energy efficiency and is essential for
Image highlights heat loss from
residential properties
42 TC MAY 2024

Simon says PIR/PUR insulation helps to create a well-insulated building envelope, reducing the need for heating and cooling systems.
net zero. By adopting fabric first, PIR/PUR robust and sustainable supply chain and correctly
insulation helps to create a well-insulated specifying and installing the most appropriate
building envelope, reducing the need for heating materials is crucial; for PIR insulation, once
and cooling systems, which in turn, lowers energy installed it requires little or no maintenance as its
consumption. By effectively managing the thermal performance is expected to last for the
transfer of heat and minimising air leakage, life of the building. Because only a thin layer of PIR
PIR/PUR insulation contributes to maintaining insulation is required to meet high thermal
comfortable indoor temperatures, reducing the performance, it can also contribute to increasing
overall carbon footprint of a building.
the overall living space within a building’s footprint.
Cost implications
Improving productivity and collaboration
Implementing a net zero approach in new
Though buildings can offer significant energy
buildings does come with financial implications. efficiency gains, greater understanding and
The initial costs associated with integrating knowledge of products and the part they play in
renewable energy systems and energy-efficient the overall energy performance of the building is
technologies may appear prohibitive. However, it essential. This, together with improved industrywide
standards, enhanced training and a much
is essential to consider the long-term benefits
and potential savings. Energy-efficient buildings more robust compliance and inspection regime,
typically incur lower energy bills, leading to are all required in reaching net zero. By promoting
reduced operational costs over the building’s innovation and best practices, the sector can
lifespan. Although financial incentives and unlock the full potential of energy-efficient
government support programs can help offset the building design and construction.
initial expenses, much more needs to be done to
The net zero approach to new buildings is an
address the cost/investment requirements in the
essential and ambitious goal for the UK to help
move to net zero.
combat climate change. While challenges exist in
terms of renewable energy sources, costs and the
Supply chain considerations
supply chain, practical solutions are available.
The transition to net zero buildings requires a
“A fabric first approach,
focused on highperformance
insulation, is a
common-sense
approach to energy
efficiency and is
essential for net zero”
By utilising high-performance insulation materials
like PIR/PUR, buildings can achieve excellent
thermal performance, reducing energy
consumption and operational costs. Furthermore,
sustainable practices in the supply chain and
enhanced collaboration across the sector are
crucial in accelerating progress toward a net zero
future.
With the climate crisis accelerating, it is
imperative for policymakers, industry
professionals, and stakeholders to work together
to address the challenges and embrace the
means of achieving net zero. By doing so, we can
create a built environment that is sustainable,
energy-efficient and conducive to a low-carbon
future.
Contact Insulation Manufacturers Association
0161 672 7387
www.insulationmanufacturers.org.uk
Insulation Manufacturers Association
MAY 2024 TC 43

Knauf Insulation Tech Talk
TAKING HOMES OFF THE HEAT WITH
RETROFITTING
Climate change and the need for more energy efficient homes means that buildings
need to use more considered passive measures for retaining heat in the winter and
keeping cool in the summer. Retrofitting provides an opportunity to improve comfort for
occupants year-round, and contractors play a crucial role in making this happen.
That’s why in this month’s technical column, Bradley Hirst, Technical Services
Manager at Knauf Insulation, explores how insulation and other passive measures can
be installed to mitigate home overheating.
Getting the insulation right
Two key factors to prioritise when installing
insulation are its lambda value (thermal
conductivity) and real-world performance.
The lambda value matters because it indicates
how heat transfers through the insulation. In
theory, a lower lambda means less heat
transfer.
While lower lambda values are preferable on
paper, bear in mind the buildability of the product.
Some products are trickier to install than others
under real world site conditions. Rigid
boards, for example, won’t sit flush to
a wall’s surface if it is not perfectly
uniform, leading to air gaps that can
compromise their performance.
By comparison, it is far easier to
achieve a correct installation with a flexible
product like mineral wool, which can be frictionfitted
and adapts to minor imperfections in a
wall’s surface. Also, where two rolls or slabs
meet, the ends ‘knit’ together, to minimise gaps
and maximise thermal performance.
Retrofitting for quick wins
Assessing the quality of any previously installed
insulation and making the relevant improvements
is a good starting point. But it’s important to take
a holistic approach to mitigating overheating.
Other measures to consider include insulating
Left: Bradley Hirst, Knauf Insulation UK. Above, left: DriTherm installation; Above, right: infographic shows the
role of insulation in summer and winter.
elements such as hot water pipes to
reduce heat transfer and using more
energy efficient appliances.
Windows are another area that can substantially
influence a building’s solar gain. Prioritise
retrofitting the south-facing façade of the building
to avoid overheating in the hottest part of the day.
Blinds, external shutters, or louvres can be
installed to help building occupants control the
amount of heat that comes in through the
windows.
There are many solar control glass products on
the market that can also be beneficial, check the
G-value of the glass to see how much energy is
transmitted, and consider special coatings that
can further reduce solar gain.
Overheating and thermal efficiency
Properly installed insulation and an air-tight,
thermally efficient building envelope will help to
keep homes warm in the winter and cool in the
summer. Well-considered design will make new
homes far better at managing solar gains, but by
taking advantage of retrofitting opportunities
contractors can improve the comfort of buildings
today.
Contact Knauf Insulation
www.knaufinsulation.co.uk
Knauf Insulation UK & Ireland
44 TC MAY 2024

Ask A Proctor
LOW LAMDA INSULANTS: FAQS
This month the team at A. Proctor Group compare low lamda insulants, focusing on aerogel
and rigid foam solutions...
In terms of thermal efficiency, aerogel
insulation and low lambda foam insulation
boards (like PIR and phenolic) perform very
similarly. But comparing them on thermal
performance alone, without taking into
consideration their other properties, is like saying
apples and oranges are similar because they are
both round fruits.
Aerogel and low lambda rigid foams are both
excellent insulators, but also very different in
other ways. In this month’s FAQs, the A.Proctor
Group looks at the performance characteristics
that set these low-lambda insulation solutions
apart.
What is the thermal conductivity of
aerogel and low lambda foam insulants?
Typical thermal conductivities range from 0.020
W/mK for aerogel and phenolic insulation, to
0.022 W/mK for a typical PIR foam board.
This range is lower – and therefore more
thermally efficient – than most other commonlyused
insulation types. The similarity in
performance means all of the products offer a
similar thermal benefit for similar thicknesses.
Precise lambda values can vary by manufacturer.
For example, A.Proctor Group’s aerogel blanket
product, Spacetherm A1, has a thermal
conductivity of 0.0195 W/mK.
What are the advantages of this thermal
efficiency?
The low lambda of rigid insulation products like
PIR and phenolic allows better U-values to be
achieved in constructions for which the products
are typically offered, including floors, walls and
roofs.
However, in solid wall applications, an air gap is
Installing Spacetherm from A Proctor Group.
often required due to the fact that the thermal
performance is detrimentally affected by being
installed to a potentially more moisture sensitive
substrate. In addition, the lowest U-values
offered by rigid boards often depend on the
insulation’s foil facing delivering a low emissivity
benefit in an adjacent air space.
Aerogel insulation is inherently hydrophobic,
meaning it is completely inert to the effects of
moisture. This means it can be fixed directly to
solid, and cavity, walls without compromising
thermal performance or damaging the insulation.
And because aerogel has no foil facing to provide
an enhanced low emissivity cavity, no air space is
required for the insulation to face into.
The unique composition of aerogel means it can
help to deliver thermal efficiency in spacecritical
areas where ‘conventional’ insulation
products are simply too thick.
The material is generally manufactured in 5-
10mm thicknesses, which can be layered to suit
the required thermal performance. These thin
layers make insulation possible in applications
where foam boards cannot be supplied at the
thickness required.
Using aerogel, the thermal performance of
ventilated facades can be enhanced generally, as
can areas of thermal bridge detailing such as
window reveals and steel beams.
Are aerogel’s moisture characteristics
important for solid wall constructions?
Moisture management in buildings is critical to
longevity of the building fabric and achieving the
intended performance from building elements.
Insulation materials therefore have to be selected
not just for their thermal performance, but also to
support good moisture management.
In new build, timber, steel and concrete framed
buildings, as well as more traditional cavity wall
constructions, the constructions are less moisture
sensitive. This allows greater flexibility in the type
and physical properties of the insulation. Foam
insulants are more than suitable for use as the
constructions benefit from a low permeability
insulation to reduce the amount of vapour that
can pass through the construction.
This is not the case with historic, solid brick and
stone buildings, however. In historic solid
masonry walls, we can have a lot of influence on
the way moisture moves due to both external and
internal conditions.
Solid walls are heavily influenced by driving rain
on the outside, often allowing quite a bit of
natural moisture penetration. The effect of this is
heavily tempered by the internal heat driving or
drying the moisture out of the wall. This allows
these walls to reach a seasonal equilibrium that
has allowed them to stand, in some cases, for
several hundred years.
Installing insulation and other energy efficiency
measures affects the building physics of the wall.
For example, adding insulation can keep the
interior warmer and cut fuel costs, but it can also
mean the walls are now significantly colder than
they have ever been due to not getting any heat to
them to help drive out the moisture. This can
result in interstitial condensation or moisture
46 TC MAY 2024

accumulating in the stone or brick like a reservoir,
leading to structural implications which could
quickly escalate.
Using vapour permeable aerogel internally can
help the wall to dry in both directions, internally as
well as externally. Impermeable foams and
membranes will limit drying to out only, meaning
no moisture buffering during the hotter months.
Balancing the thickness of vapour permeable
aerogel means you can get a good level of thermal
comfort without building in any moisture or drying
out issues.
Our technical team has extensive knowledge of
modelling these types of construction and can
provide tailored advice depending on the extent of
refurbishment being aimed for.
In summary...
To summarise, traditional buildings featuring solid
wall constructions must be treated correctly when
looking to install an internal wall insulation
system. While every building behaves differently,
it can broadly be said that there are times when a
solid wall needs to dry to the inside of the
building.
This puts the onus on the building fabric to be
breathable and allow the passage of moisture
vapour. Otherwise, moisture remains trapped in
the masonry and can lead to mould and
deterioration of the wall build-up.
The vapour permeability of aerogel is therefore a
highly desirable performance characteristic for
retrofitting traditional buildings, allowing it to be
installed directly onto the wall. The
impermeability of PIR and phenolic insulation
requires the foam boards to be installed with an
air space between them and the masonry –
adding to the overall depth of the insulation
system and eating into more of the existing floor
space.
Contact A Proctor Group
www.proctorgroup.com
A. Proctor Group Ltd.
‘GATEWAY-READY’ RAINSCREEN CAVITY SYSTEMS
Knauf Insulation has launched Rocksilk
RainScreen Cavity Systems, a range of
complete tested systems designed to simplify
specification and support compliance in
cladding and masonry façades. The systems
consist of sheathing insulation, fixings, and
cavity barriers.
“The Building Safety Act places much more
scrutiny on everyone working on high-risk
buildings,” said Luke Davies, Rock Mineral Wool
Product Manager at Knauf Insulation. “The
‘gateways’ it introduces, plus the ever-stricter
compliance criteria of the Building Regulations,
mean it’s never been more important to get your
specification right. That’s why we’ve launched
these systems – to make it easier for specifiers
to meet these challenging requirements with a
single system, backed up by rigorous test data.”
The Rocksilk RainScreen Cavity Systems
combine existing Knauf Insulation rainscreen
products with a series of new cavity barrier
solutions, including open state cavity barriers
with an intumescent strip, a closed state cavity
barrier, and further additions to Knauf
Insulation’s innovative face-fixed masonry cavity
barrier range launched last year. The full range
The systems consist of sheathing insulation, fixings, and
cavity barriers.
of cavity barriers enables specifiers to choose
the system that best meets their fire
performance needs, confident it has been tested
to the relevant standards. Rocksilk RainScreen
Cavity Systems can be used with the major
substrate types, including blockwork, steel, and
timber.
The full range of cavity barriers consists of:
Rocksilk RainScreen FireStop Slab is a cavity
barrier manufactured from rock mineral wool,
suitable for use as a vertical cavity barrier in
buildings with a ventilated cavity, and vertically
and horizontally in buildings with masonry
façades.
Rocksilk RainScreen OSCB and OSCB Plus
are horizontal cavity barriers manufactured from
rock mineral wool, shrink wrapped with a
reactive intumescent strip, for use in ventilated
cavities up to 450mm.
Rocksilk RainScreen FFCB is a patented cavity
barrier made from rock mineral wool, that is
designed to be face-fixed to Rocksilk RainScreen
Slab as the masonry façade is constructed. It is
non-combustible with the best possible
Euroclass A1 reaction to fire classification and is
manufactured using our unique bio-based
binder, ECOSE Technology. It is the only cavity
barrier that can be fixed to the face of the
sheathing insulation without needing to cut into
it, which reduces waste, saves time and
protects performance.
Each cavity barrier has been tested as part of a
system with Rocksilk RainScreen Slab sheathing
insulation to provide fire resistance in the
appropriate rainscreen façade applications.
Rocksilk RainScreen Slab sheathing insulation is
non-combustible rock mineral wool and suitable
for use in higher-risk buildings, and at any
height. Rocksilk RainScreen Slab has Agrément
certificates from the BBA for the broadest range
of build-ups and the widest range of thicknesses
of any rainscreen solution on the market.
www.knaufinsulation.co.uk/rainscreencavity-systems
MAY 2024 TC 47

Health & Safety
CREATING A CULTURE OF SAFETY
Given recent news regarding the messaging around building mobile access towers by
mixing and matching tower components from different manufacturers, which should be
avoided, it is important that all employers and employees are on the same page when it
comes to preventing accidents. Here, Dave Elson, Compliance Manager at WernerCo UK,
discusses how employers can ensure they cultivate a culture of safety.
Tradespeople will know that working at
height comes as part of the job. However,
given the associated risks, it is important
that employers take their responsibilities
seriously when it comes to employee safety.
Therefore work should be – according to Working
at Height Regulations – adequately planned,
supervised and carried out by competent
workers.
Regulations also dictate that the right type of
equipment for the job should always be used.
Failure to comply with regulations can not only
result in civil litigation and prosecution, but most
significantly, this can cause serious harm to
employees.
Considering this, employers should ensure they
are nurturing a culture of safety within their
organisations.
Provide regular and engaging training
Regulations state that employees must report
hazards and use their equipment responsibly.
However, in order to ensure all employees have
an adequate understanding of what is expected of
them, regular and engaging health and safety and
equipment handling sessions should be provided
by the employer.
Not only does continued and quality training
enable employees to develop their safety
knowledge, but it also empowers them to report
risks and propose ways to manage those risks,
resulting in a safer site environment.
Encourage planning and organisation
Many of the requirements written into the
Working at Height Regulations reflect the
importance of preparation on site. Considering
this, it is important for employers to educate and
empower employees and provide the correct tools
for the job.
Therefore, they should encourage employees to
consider general site safety, weather conditions,
the likelihood of falling objects and the site layout
for emergency contingency plans before beginning
work.
Organisation and preparation are the key to
reducing the risk of accidents and in understanding
how to act should an incident occur.
Providing the correct equipment
It is essential that employers provide the correct
equipment for their employees to use. For
example, when it comes to ladders, within EN131
there are two classifications – Professional and
Non-Professional. To ensure the highest quality
for the intended use, employers should always
provide employees with Professional ladders that
meet EN131 standards.
All EN131-certified ladders feature markings that
indicate their suitability for commercial use.
Ladders intended for work on private dwellings, in
other words, ladders certified for ‘Non-
Professional Use’, should not be provided to
employees.
Insist on regular inspections
While the correct equipment may have been
provided, caution is still required as ladders can
become damaged. Therefore, checks should be
carried out by a competent person each time a
ladder or piece of access equipment is used.
It is also essential that employees are
encouraged to keep a record of all inspections for
reporting.
In addition, ladders and access platforms should
be assembled according to the manufacturer’s
guidance. As mentioned, for example, it is vital
that components across different manufacturers
aren’t used to assemble tower structures.
Once inspections are complete, it is
recommended that a competent person with the
appropriate level of knowledge, training and
experience checks the tower structure or ladder’s
assembly.
Employers looking to build a strong culture
around safety can look to a wide range of
resources available that can support them in
creating this, including the information laid out as
part of WernerCo’s Stepping up to Safety
initiative. This includes a variety of practical
guides and the latest information on safety
standards. Visit:
www.wernerco.com/uk/ladder-safety
Contact WernerCo UK
www.wernerco.co.uk
48 TC MAY 2024

40V XGT 2 PIECE KIT: BRUSHLESS COMBI DRILL & IMPACT DRIVER
120+
40V MAX XGT COMBI & IMPACT DRIVER KIT: DK0176G205
Combi Drill, Impact Driver, 2x 2.5Ah Batteries,
Rapid Charger, Makpac Case.
Discover the expansive XGT 40V and 80V Max line-up.
With over 120 products and still expanding, the XGT range is your
ultimate alternative to traditional petrol and mains power sources.
Experience on-demand power across our complete product spectrum.
Makita provides more than just power tools, explore our full range at
makitauk.com and follow us on socials for updates.
makitauk.com

Updates
For further info on all these updates and more, visit www.total-contractor.co.uk
SHORTS SORTED!
When the temperature rises on an active workday, Snickers Workwear’s new Work Shorts
help you stay ventilated and comfortable all day, every day.
Combining 4-way softshell stretch fabric with sustainable Sorona 2-way stretch fabric, these
shorts have windproof sections plus ventilating areas for enhanced comfort and freedom of
movement.
With body-mapping designs that deliver superb functionality, the shorts come in range of stylish
colour ways to compliment the new Snickers Workwear 100% Cotton ‘Logo T-shirts’ which will
energise and brighten your workday.
Whatever combination you choose, you’ll be wearing street-smart working clothes with outstanding
functionality and long-lasting comfort – all summer long.
www.snickersworkwear.co.uk
HIKOKI PROVIDES TORQUE BOOST TECH
HiKOKI Power Tools has introduced the C3612DRA 36V 12" Compound Mitre Saw into its range of industry
leading cordless power tools. Engineered for precise cutting and working, this powerful and versatile
Mitre Saw delivers unmatched accuracy and heightened productivity for all your woodworking projects.
Featuring HiKOKI’s incredible Torque Boost Technology, and compatible with the awesome power of Multi Volt Liion
batteries, this Mitre Saw maintains the perfect balance of speed, precision and performance, no matter how tough the task.
The new motor wiring structure enables automatic switch between High-Speed and High-Torque motors to achieve power and speed, delivering 1.7 times
faster speeds, enabling smooth cutting and preventing sudden stops under heavy load. The tool is ideal for a diverse range of cutting work, from plywood
and delicate panels to hard boards and even aluminium, for instance in window sashes. The integral XACT CUT LED lighting system uses an LED light to
cast a shadow where the blade will cut on the material for precise and efficient cutting, provides users with unparalleled accuracy and allows for easy
adjustment of the blade to the cut line, enhancing precision and efficiency in every cut. Additionally, the metal adjustable scale ensures accuracy,
maintaining precise measurements for reliable results over time. www.hikoki-powertools.co.uk
ENGINEERED FOR WORK, DESIGNED FOR COMFORT
‘Sturdy and warm, flexible and built to last’, Carhartt says its range of denim is ‘the perfect choice’ if
you’re working outdoors on site.
For cooler days when you need some extra warmth, the relaxed fit Denim Fleece Lined Snap-Front Shirt is
described as ‘tough on the outside but snug’. It comes with an ‘iconic’ Carhartt blanket lining made from
100% polyester printed fleece, two chest pockets with button closures and a dedicated pencil opening, as
well as two lower-front pockets for essential items. This ‘shirt jac’ is said to be ‘an ideal choice for those
who want something sturdy yet comfortable, lightweight but warm and roomy enough for layering over a shirt
and sweater’.
Denim’s resilience, coupled with its classic comfort, makes jeans, overalls and shirts in denim the ideal
workwear wardrobe staple, and with the great choices in Carhartt’s range, the clothing supplier says there’s
something to suit every task. www.carhartt.com
50 TC MAY 2024

Nail it
down with
confidence
DON’T FORGET TO
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SRTGBRCIA0723 V1 | © SR Timber 2023. All rights reserved.

SEAMLESS ALUMINIUM
group
COPING
STANDING SEAM
RAINWATER SYSTEM
MANUFACTURER OF ALUMINIUM RAINWATER SYSTEMS
SPECIALISING IN BESPOKE PRODUCTION
Telephone: +44 (0)121 765 4355
Email: Info@seamlessaluminium.co.uk
Website: www.seamlessaluminium.co.uk
Address: Seamless Aluminium International Ltd,
Unit 6b, Solihull Building Trade Centre,
Olton Wharf, Olton, West Midlands B92 7RN.
Telephone: +353 71 98 51551
Email: Info@seamlessaluminium.ie
Website: www.seamlessaluminium.ie
Address: Seamless Aluminium Group LTD,
Cavangarden, Ballyshannon,
Co Donegal, F94 D767