SMOKE BARRIERS - Fire Compartmentation


• Time & Cost Effectiveness
• Slimwalls
• Lightweight
• Thermal Resistance
• Impact Resistant
• Acoustic Performance
• Fire Resistance Performance

The purpose of a cavity barrier is to prevent smoke and flame from penetrating and/or moving within a concealed space in a fire compartment.

Building Regulations provide guidance on where such barriers should be located within hidden voids in a building and they give examples of deemed-to-satisfy barriers for voids in stud walls or partitions.

If a barrier in a concealed space coincides with a compartment wall or floor it will normally be required to provide the same fire performance as the wall or floor. If the barrier is located between such walls or floors however, the barrier is defined as a ‘cavity barrier’ and as such will normally only be required to provide 30 minutes integrity and 15 minutes insulation. There are also instances where insurance companies insist on 30 minutes insulation. “Large” and “small” cavity barriers are only defined in Scottish Building Regulations. For insurance purposes, a large barrier is more than 600mm x 600mm.

A large cavity barrier is defined as a barrier across a void in which a square with 1m sides can be accommodated. A small cavity barrier is a barrier in which such a square cannot be accommodated. A large cavity barrier is required to provide 30 minutes integrity and 15 minutes insulation whereas a small cavity barrier need only provide 30 minutes integrity.


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