Table 12.1 Limitations on roof coverings

Department for Communities and Local Government, (2019) Table 12.1 Limitations on roof coverings. [Image]


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Separation distances do not apply to the boundary between roofs of a pair of semi-detached dwellinghouses and to enclosed/covered walkways. However, see Diagram 5.2 if the roof passes over the top of a compartment wall.
Polycarbonate and uPVC rooflights that achieve a class C-s3, d2 rating by test may be regarded as having a BROOF(t4) designation.
1. The designation of external roof surfaces is explained in Appendix B.
2. Not acceptable on any of the following buildings.
a. Dwellinghouses in terraces of three or more dwellinghouses.
b. Any other buildings with a cubic capacity of more than 1500m3.
3. Acceptable on buildings not listed in (1) if both of the following apply.
a. Part of the roof has a maximum area of 3m2 and is a minimum of 1500mm from any similar part.
b. The roof between the parts is covered with a material rated class A2-s3, d2 or better.

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Additional Information: mml-maui-text-analytics-keywords
Uncontrolled Keywords: external wall, unprotected area, dwellinghouse, b4 external fire spread, separated part, roof, passive stack ventilation (psv), fire compartment, storey, boundary
Subjects: T Technology > TH Building construction > Building standards > fire safety - volume 1: dwellings. 2019 edition - for use in england > Section 12: Resisting fire spread over roof coverings
K Law > The Building Regulations 2010 > B4: External fire spread
T Technology > TH Building construction > Building standards
Date Deposited: 12 Mar 2020 06:34
Last Modified: 13 Oct 2021 19:42

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