Current
Core Supplement
Certificate
Relates to membranes for fully adhered or loose-laid roof waterproofing specifications with suitable ballast covering, and inverted and green roof systems on limited access flat roofs. Key factors assessed were weathertightness; behaviour in relation to fire; resistance to wind uplift, mechanical damage and penetration of roots; and durability.
Fourth issue, dated 15th April 2021. Supersedes the third issue, dated 3rd November 2017. Originally certificated on 20th August 2015.
The British Board of Agrément have been providing authoritative and independent information on the performance of building products for over 40 years. The certificates they produce contain data on durability, installation and compliance with Building Regulations.
NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.
We connect trusted knowledge to customers' workflows – mitigating risk, increasing efficiency and accelerating innovation For more than 60 years, leading R&D and engineering-intensive organizations have relied on us to achieve on-time, on-budget delivery of complex projects and new products. We deliver an unparalleled combination of technical content and Artificial Intelligence (AI) technologies to surface answers from the vast universe of technical knowledge, both inside and outside the organization. In a single interface, we connect the dots between information scattered across many different sources, allowing technical professionals to make better, more informed decisions faster.