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9.25.1.2.(7)
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Application
Application 1: 
Air spaces inboard of sheet or panel-type wall cladding, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where the cladding:
  • has an air leakage characteristic less than 0.1 L/(s•m2) at 75 Pa,
  • has a water vapour permeance less than 60 ng/(Pa•s•m2), and
  • is installed in a building assembly that is required to be insulated (see Article 9.25.2.1.).
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Intent
Intent 1: 
To expand the application of the air space criteria stated in Clause 9.27.2.2.(1)(a) to air spaces required to be provided inboard of low air- and vapour-permeance cladding on walls (see Clause 9.25.1.2.(2)(c)).
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