DESIGN PROCESS
tests. Ignitability of products subjected to direct impingement of flame - Single-flame source test and BS EN 13823 Reaction to fire tests for building products. Building products excluding floorings exposed to the thermal attack by a single burning item.
Extract from Approved Document B
Table 10.1 Reaction to fire performance of external surface of walls
Building type
Building height
Less than 1000m from the relevant boundary
1000m or more from the relevant boundary
Class A2-s1, d0 (1) or better Class A2-s1, d0 (1) or better
‘Relevant buildings’ as defined in regulation 7(4) (see paragraph 10.10)
Class B-s3, d2 (2) or better
From ground level to 18m: class C-s3, D2 (3) or better From 18m in height and above: class B-s3, d2 (2) or better Up to 10m above ground level: class C-s3,d2 (3) or better Up to 10m above a roof or any part of the building to which the public has access: class C-s3, d2 (3) or better From 10m in height and above: no minimum performance From ground level to 18m: class C-s3, d2 (3) or better From 18m in height and above: class B-s3, d2 or better
Assembly and recreation More than 18m
Class B-s3, d2 (2) or better
18m or less
Class B-s3, d2 (2) or better
Any other building
More than 18m
Class B-s3, d2 (2) or better
No provisions
18m or less
NOTES: In addition to the requirements within this table, buildings with a top occupied storey above 18m should also meet the provisions of paragraph 10.6. In all cases, the advice in paragraph 10.4 should be followed. 1. The restrictions for these buildings apply to all the materials used in the external wall and specified attachments (see paragraphs 10.9 to 10.12 for further guidance). 2. Profiled or flat steel sheet at least 0.5mm thick with an organic coating of no more than 0.2mm thickness is also acceptable.
3. Timber cladding at least 9mm thick is also acceptable. 4. 10m is measured from the top surface of the roof.
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