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5.5.1.1.(3) | Application | Intent |
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Application | Application 1: Vapour barriers installed
to provide resistance to vapour diffusion through building assemblies,
and through interfaces between assemblies, that are subject to differentials
in temperature and water vapour pressure and where a lack of control of vapour
diffusion will not adversely affect health, safety, the intended use of the building or the operation of building services.
Application 2: This also applies to the position of low air and vapour
permeance materials within the building assembly
relative to the position of materials providing thermal resistance in the
assemblies of buildings to which Part 9 applies
[see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where
the building assembly:
Application 3: This also applies to the design of vapour
barriers in buildings to which Part 9 applies
[see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where
the building assembly is more susceptible to condensation
[see Sentences 9.25.4.2.(2) and (3) for combinations of interior and exterior
environmental conditions that create a higher risk for condensation].
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Intent | Intent 1: To exempt situations from the application of Section 5.5.,
where a lack of control of vapour diffusion will not adversely affect health,
safety, the intended use of the building or the operation of building services.
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