Relates to a protected waterproofing layer for flat roofs, podiums, green roofs and roof gardens. Key factors assessed were weathertightness; thermal performance; condensation; properties in relation to fire; resistance to wind uplift, mechanical damage and root penetration; and durability.
Date of third issue: 29th August 2018. Supersedes the second issue, dated 10th March 2015. Originally certificated on 13th March 1990.
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.
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