Reaction to fire performance of external surface of walls

Table 5.1A Reaction to fire performance of external surface of walls Building Type | Building height | Less than 1m from the relevant boundary | 1m or more from the relevant boundary 'Relevant buildings' as defined in regulation 23(4) | Class A2-s1,d0(1) or better | Class A2-s1, d0(1) or better Assembly and recreation | More than 18m | 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 Assembly and recreation | 18m or less | 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 have access: class C-s3, d2(3) or better(4). From 10m in height and above: Class E-d2 or better Any other building | More than 18m | 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 Any other building | 18m or less | Class B-s3, d2(2) or better | Class E-d2 or better Notes: In addition to the requirements within this table, buildings with a top occupied storey above 18m should also meet the provisions of paragraph 5.4. (1) The restrictions for these buildings apply to all the materials used in the external wall and specified attachments (see paragraphs 5.4C to 5.4F 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.