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3.1.5.4.(5)
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Application
Application 1: 
Combustible window sashes and frames in buildings described in Sentence 1.3.3.2.(1) of Division A that are required to be of noncombustible construction and where:
  • each window in an exterior wall face is an individual unit separated by noncombustible wall construction from every other opening in the wall,
  • windows in exterior walls in contiguous storeys are separated by not less than 1 m of noncombustible construction, and
  • the aggregate area of openings in an exterior wall face of a fire compartment is not more than 40% of the area of the wall face.
Application 2: 
This also applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are required to be of noncombustible construction, as stated in Sentence 9.10.6.1.(1).
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Intent
Intent 1: 
To exempt certain combustible materials from the application of Sentence 3.1.5.1.(1) if certain conditions are met, on the basis that the materials are deemed to insignificantly contribute to fire growth and spread.
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