Executive Summary
This paper provides an overview of the key factors that should be considered when selecting and installing membranes for sealing around windows and façade interfaces. The intention is to assist architects, designers, and contractors in making informed decisions about the use of these materials, ensuring that all products meet the necessary standards of performance and compliance. There are now several membranes being offered to the façade industry for sealing around windows and façade interfaces, both for new-build and re-clad projects. However, due to the varying product specifications, identifying the appropriate membrane for each application can still be a challenge. In view of establishing some consistency on what is a very important part of the external wall build-up, the Government has implemented regulation, such as the Building Safety Act 2022 and issued documents such as Approved Document B, to ensure that window and façade membranes are compliant with the Building Regulations and conform to the relevant test standards. These regulations and standards have helped to clarify the specification process, providing architects, designers, and contractors with clear guidelines regarding membrane performance standards and correct installation practices. Even so, there remains an element of confusion within the industry about which membranes are not only compliant, but more importantly, which ones have also been tested to, and comply with, the correct harmonised standards for performance. This is a critical part of the specification and design process to ensure that the chosen membrane, above all else, performs its primary function and is fit for purpose.
Hierarchy of Regulations
• Regulation 7 • Approved Document B • EN 13984 • EN 13859-2
These standards govern the performance and fire requirements of membranes used in facades.
Version: 06.U.06.10.01.01
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