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5.5.1.2.(1) | Application | Intent |
OH1 | OS2 |
Objective | OS2 Structural Safety |
Attribution | |
Application | Application 1: Properties and location of materials installed to
provide resistance to vapour diffusion through building assemblies,
and through interfaces between assemblies described in Sentence 5.1.2.1.(1) that
are installed in buildings to which Part 5 applies
[see Sentence 1.3.3.2.(1) of Division A for application of Part 5].
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 installing materials that are
unable to adequately control vapour diffusion (except diffusion of moisture
from the ground) through environmental separators under expected environmental
loads, which could lead to condensation, which could lead to deterioration,
which could lead to compromised structural integrity of the separators or
of elements supported or protected by the separators, which could lead to
structural failure, which could lead to harm to persons. |
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