Last edited 16 Aug 2017

Cavity barrier

Approved document B of the building regulations, Fire Safety, defines a cavity barrier as:

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.

Where a concealed space is:

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.

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