Fire Regulations require that cavities and concealed spaces, in the structure or fabric of a building, are sub-divided or sealed by means of cavity barriers or fire-stopping to restrict the hidden spread of smoke and flames.
Cavity barriers are typically pieces of fire-stopping material which are fitted within building cavities - horizontally at each floor, and vertically at each party wall. This assists with fire compartmentation. ... Services that may run through a barrier should be fire-stopped using appropriate materials.
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