76 EXTERNAL ENVELOPE
The green roof industry is forecast to continue growing at pace, with increasing awareness of the impact green roofs can have on the environment
part of a green roof system with a variety of membrane/insulation build-ups so long as
those products also have BROOF(t4) EXAP. Furthermore, there’s an additional assurance architects and specifiers can access; Approved Document B goes on to say that if the green roof build-up from the deck to the finished surface includes a minimum 80 mm of substrate with less than 50% organic content then it can be assumed there will be no spread of fire. This does mean that the growing medium rules need strictly adhering to. If installers – even accidentally – lay the substrate thinner than 80 mm in a roll-out system it may not comply. Modular systems overcome this challenge because they are pre-filled to standardised levels, some having 100 mm of
super deep growing medium, with the batch-tested mix of substrate consistently applied across the many thousands of trays filled annually. GRO advises that to ensure there is no danger of fire spread or penetration the growing medium for extensive green roofs should be tested in line with BS 8616:2019 and contain no more than 20% organic content by volume (with no peat) and comply with GRO guidelines.
Conclusion
The green roof industry is forecast to continue growing at pace, with increasing awareness of the impact green roofs can have on the environment by supporting biodiversity, managing stormwater run-off, improving air quality, reducing the ‘Urban Heat Island’ effect in towns and cities and offering sound and thermal insulation benefits. By combining advice from ADB, the DCLG’s ‘Fire Performance of Green Roofs and Walls’ and the GRO Code, designers can be assured of delivering a green roof that is fit for purpose, long- lasting and safe.
Julian Thurbin is director of Wallbarn
State-of-the-art college to benefit from superior airtightness The superior airtightness performance qualities of the Wraptite®
air barrier system from the A. Proctor Group
will enhance a new state-of-the-art development at St Dunstan’s College – a co-educational independent school in Catford, London. Contractor Willmott Dixon will deliver the new Junior School, STEM building and Sixth Form Hub at St Dunstan’s. Phase one includes a new junior school with specialist facilities for art, music and performance, and phase two includes the construction of the STEM Centre and Sixth Form Hub. A vital element of the design and construction is to maximise the energy efficiency of the new buildings: Wraptite airtightness membrane, the only self-adhering vapour permeable air barrier certified by the BBA, will form a crucial part of the solution. The inclusion of Wraptite within the facade will ensure “as-designed” performance, narrowing the gap between as-designed and actual energy performance and reducing the likelihood of potential failures to meet required airtightness levels. Wraptite is compliant with Part B regulation changes and also has BBA approval for unrestricted use in buildings over 18m in England and 11m in Scotland.
01250 872261
www.proctorgroup.com Schüco launches next generation ADS 65 HD door system
Schüco has released a new generation of its tried-and-tested ADS 65 HD door system for entrances and exits subject to heavy use in residential and commercial buildings. The second generation of the aluminium door system combines increased weathertightness and thermal insulation with complete ease of operation and high stability. Its compatibility with the Schüco modular system, and its different fitting options, offers flexibility in terms of application and design for both newbuilds and renovation projects. Thanks to its new centre gasket system and large insulation chambers, the Schüco ADS 65 HD Gen2 can achieve watertightness to Class 7A, air permeability to Class 4 and wind load resistance to Class C2. Its U-value has been reduced from 2.2 in the previous model to 1.4 W/(m2
K) ensuring the door system is compliant with the new Part L building regulations
due to come into force in June 2022. The ADS 65 HD Gen2 door system also benefits from a barrier-free level threshold with surface water drainage providing trip-free access. Smart building components, such as Schüco Fingerprint Easy and fully automated electric locks, can also be integrated into the profile system.
01908 282111
www.schueco.com/uk/specifiers/products/doors/aluminium/ads-65-hd-gen2
WWW.ARCHITECTSDATAFILE.CO.UK
ADF FEBRUARY 2022
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