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Cavity barriers are one of two elements of fire protection in buildings, alongside Fire Stop. A cavity barrier can be used to close concealed spaces, such as ceiling voids or cavity walls and thus, prevent movement of smoke and flames. These concealed spaces can prove easy routes for fire and smoke to travel through building compartments, and a cavity fire barrier acts as a robust barrier.
A cavity barrier can be installed where external wall cavities are aligned with compartment walls or floors and around openings like windows and doors. Acoustic cavity barrier can be applied in suspended ceiling voids, at the top of walls, on metal decks or on raised floor voids.
Passive fire protection methods such as fire rated cavity barriers have specific minimum requirements according to BS9991 and Approved Document B2. These minimum requirements are:
- 30 minimum integrity – with 0.5mm thick steel or 38mm timber as suggested materials for window perimeters
- 15 minimum insulation – BS9991 Fig. 24, Table 3
Cavity barrier is easy to cut to size and is usually friction fitted.