Fire Performance in Timber Facade Design: Approved Document B, System Specification and Common Mistakes

Description: Fire performance has moved from a post-design compliance check to a first-stage design parameter for anyone working on external timber cladding in the UK. The changes to Building Regulations following the Grenfell Tower fire significantly tightened what is required, how it must be demonstrated, and what constitutes acceptable evidence at Building Control submission. For structural and facade engineers, understanding the regulatory framework and the practical specification requirements is now essential from project inception. This article covers the regulatory structure, what Approved Document B actually requires for different building types, how to specify a compliant timber cladding system, and the most common mistakes that lead to failed submissions or late-stage redesign.

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