NCC 2022 Volume One - Building Code of Australia Class 2 to 9 buildings
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9

Specification 9 Cavity barriers for fire-protected timber

Specification 9 Cavity barriers for fire-protected timber

2019: Spec C1.13: 1
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Specification 9 sets out requirements for cavity barriers used for fire-protected timber. A cavity barrier is a barrier/enclosure provided to cavities within, around or adjacent to fire-protected timber. The purpose of a cavity barrier is to limit the spread of fire, smoke and hot gases to other parts of a building in the event of a fire. A cavity barrier is used under C2D13 to permit fire-protected timber to be used in lieu of non-combustible material.

The requirements for cavity barriers in Specification 9 include but are not limited to:

  • the location of cavity barriers, i.e. junctions between fire-resisting floor/ceiling assemblies and fire-resisting walls;
  • minimum thickness of timber used as a barrier;
  • minimum thickness of insulation; and
  • the method to determine the FRL of the cavity barrier. 
2019: Spec C1.13: 2
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