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5.5.1.1.(2) | Application | Intent |
OH1 | OS2 |
Objective | OH1 Indoor Conditions |
Attribution | |
Application | Application 1: Installation of vapour barriers 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.
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 limit the probability of an inadequate resistance to
vapour diffusion (except the diffusion of moisture from the ground) through
environmental separators under expected environmental loads, which could lead
to condensation. This is to limit the probability of:
This is to limit the probability of:
This is to limit the probability of harm to persons.
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