Question to the Department for Levelling Up, Housing & Communities:

To ask the Secretary of State for Housing, Communities and Local Government, Pursuant to the Answer of 22 February 2018 to Question 128437, on High Rise Flats: Fire Prevention, for what reasons that Answer does not indicate whether (a) class 0 (national class) and (b) class B-s3, d2 must be composed only of materials that are of limited combustibility.

Approved Document B uses a series of national and European classifications in describing the reaction of construction products to fire (see table below and explanation in Appendix A of Approved Document B). As the table shows, Class 0 and Class B-s3, d2 materials would not meet the definition of ‘material of limited combustibility’ (defined, for the purposes of Approved Document B, in Table A7 of Approved Document B) because these are different, less onerous classifications. Class 0 and Class B-s3, d2 materials would therefore not necessarily meet the requirements in paragraph 12.7 of Approved Document B for insulation products, filler materials etc to be of limited combustibility for buildings over 18 metres.

National European

Non Combustible Class A1

Material of Limited Combustibility Class A2

Class 0 Class B

Class 1 Class C

Class 2 Class D

Class 3 Class E

Class 4 Class F