Last edited 16 Aug 2017

Concealed space

Approved document B of the building regulations, Fire Safety, defines a concealed space or cavity as:

A space enclosed by elements of a building (including a suspended ceiling) or contained within an element, but not a room, cupboard, circulation space, protected shaft or space within a flue, chute, duct, pipe or conduit.

Requirements for concealed spaces are set out in Section 6 of approved document B1 and section 9 of approved document B2, and relate predominately to the construction of concealed spaces and the provision of cavity barriers, that is:

A construction, other than a smoke curtain, provided to close a concealed space against penetration of smoke or flame, or provided to restrict the movement of smoke or flame within such a space.

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