October 2019

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Advice: Green Roofs WATERPROOFING GREEN ROOFS: BEST PRACTICE ADVICE... Victoria Ramwell, from Kemper System, discusses specification and installation best practice for waterproofing green roofs and the benefits of liquid waterproofing solutions. Market research has predicted that by 2022 the global green roofs market will have grown by more than £8bn within four years. The analysis, carried out by market research company Technavio, revealed that one of the biggest drivers is the role green roofs can play in reducing global warming. solution can be installed either below or above the insulation, depending on the type of insulation used. This is because a number of these systems are FLL certified as root resistant, so there is no risk of root damage to the integrity of the waterproofing membrane, even as plants mature and their root size increases. A green roof absorbs heat and adds mass which reduces heating and air conditioning requirements making them ideal for properties of all kinds. For new homes, they can also provide habitats for nature, reduce noise, manage storm water and provide a striking addition that matures to enhance the structure’s character. With demand rising, contractors must consider a number of factors to ensure a green roof is installed correctly, paying particular attention to the choice of waterproofing membrane, which is a crucial specification element. Membrane considerations Selecting the right waterproofing membrane between the roof substrate and the green roof system is vital. The membrane should be flexible enough to cope with any post-build settlement, durable enough to cope with the planting’s loadbearing requirements and have a sufficiently long service life to make the green roof viable. A common green roof design would typically consist of an inverted warm roof build-up with the waterproofing system applied to the roof substrate, followed by the insulation, and then the green roof elements. This can add an extra layer of protection for the waterproofing membrane as it is cushioned underneath the insulation. However, a cold-applied liquid waterproofing Liquid waterproofing benefits The recent construction of an impressive selfbuild property in Surrey (see right) highlights the benefits of using a cold-applied liquid waterproofing solution in a domestic setting. Featuring two green roofs, the detached self-build property spans 258m² and has been designed by an architectural practice headed by former head of RIBA, Jane Duncan. Positioned to make the most of the views, daylight and sunshine, it has been built using a range of natural materials, including timber cladding and Scandinavian bricks. Homeowner and former builder Nigel Warnes helped to specify Kemper System’s Kemperol V210 liquid waterproofing resin for the project. The product was required for a sedum roof above the main living area and another above the new garage. The liquid was installed ‘wet on wet’ in a single process using a reinforcement fleece. The resin was applied until the fleece was no longer visible which indicated it was fully saturated and enabled the contractor to obtain a consistent depth and coverage. Once cured, the liquid resin formed a seamless and elastomeric membrane. As the Kemperol is liquid applied, this also ensured it could be easily and quickly installed This self-build property in Surrey features two green roofs. around any detailing, including two large rooflights. On the upper elevation of the property, the contractor installed the Stratex Warm Roof System which comprises all the elements needed for a warm roof specification including the air and vapour control layer (AVCL), insulation and waterproofing. The liquid waterproofing membrane has guaranteed a watertight barrier between the roof substrate and the green roof systems, and is also root resistant. Its strength and flexibility provide the homeowner with the assurance that the sedum roof will remain viable for at least 20 years. Specialist advice Whether you’re installing a green roof for a family home or city centre building, it is important to seek technical advice from waterproofing and green roof specialists. Their knowledge will help you to install a green roof effectively, ensuring it performs to the required specification and meets climatic, aesthetic and biodiversity requirements. Contact Kemper System 01925 445532 www.kempersystem.co.uk @KemperSystemUK 54 TC OCTOBER <strong>2019</strong>
Exceeding expectations Our prefabricated modular skylights are revolutionising commercial roof design and installation. Faster Install three times faster than traditional skylights Safer Reduced workers at height and no scaffolding required Easier Unique pre-fabricated flashing and components offer a simple, easy install VELUX Modular Skylights are built to the highest quality & carry a 10 year warranty Available in mono and self-supporting duo pitch for flat and slope roofs, VELUX Modular Skylights are available with integral blinds, comfort ventilation and smoke ventilation options. Find out more at commercial.velux.co.uk
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OCTOBER 2019 An Inspector Calls Per
Page 3 and 4: I V Editor’s Comment MATT DOWNS E
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Page 9 and 10: Aluminium Roof Lantern FROM THE AWA
Page 11 and 12: Handrails:- EasyGuard free-standing
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Page 50 and 51: Advice: Green Roofs A GUIDE TO GREE
Page 52 and 53: Advice: Green Roofs Above: Semi-int
Page 56 and 57: Height Safety NEW HEIGHTS FOR DESIG
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Page 60 and 61: Product Planning TAKE THE TIME TO P
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October 2019

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