Floors in loft conversions

Department for Communities and Local Government, (2019) Floors in loft conversions. In: Approved Document B: Fire Safety - Volume 1: Dwellings. 2019 ed. Section 5: Internal fire spread – dwellinghouses, 1 (5.4). RIBA Publishing Publication, London, p. 50. ISBN 9781859469156

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Abstract

Where adding an additional storey to a two storey single family dwellinghouse, new floors should have a minimum REI 30 fire resistance. Any floor forming part of the enclosure to the circulation space between the loft conversion and the final exit should achieve a minimum rating of REI 30.
The existing first-storey construction should have a minimum rating of R 30. The fire performance may be reduced for integrity and insulation, when both of the following conditions are met.
a. Only one storey is added, containing a maximum of two habitable rooms.
b. The new storey has a maximum total area of 50m2.

Item Type: Book Section
Additional Information: mml-maui-text-analytics-keywords
Uncontrolled Keywords: single storey, dwellinghouse, storey, fire compartment
Subjects: Section 05: Internal fire spread – dwellinghouses
B3: Internal fire spread (structure)
Building standards
Date Deposited: 15 Feb 2020 06:05
Last Modified: 29 Sep 2022 21:01
URI: https://buildvoc.co.uk/id/eprint/455

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