3.1.5.6. Combustible Components in Exterior Walls

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3.1.5.6. Combustible Components in Exterior Walls

1) Combustible components, other than those permitted by Article 3.1.5.5., are permitted to be used in an exterior wall assembly of a building required to be of noncombustible construction, provided

a) the building is

i) not more than 3 storeys in building height, or

ii) sprinklered throughout, and

b) the wall assembly

i) meets the requirements of Clause 3.1.5.5.(1)(b), or

ii) is protected by masonry or concrete cladding not less than 25 mm thick.

Design Key:

1. Combustible components in exterior walls are permitted for a sprinklered noncombustible construction building with masonry or concrete cladding.

2. Combustible components in exterior walls are permitted for a building not more than 3 storeys with masonry or concrete cladding.

This sentence is very helpful if you are struggling for meeting the spatial calculation requirements of noncombustible construction.