ARCHIVED - 5.2.1.3.(1)

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5.2.1.3.(1)


Objective	OS2 Structural Safety
Attribution	[F61,F51,F63-OS2.3] Applies to heat, air and moisture transfer calculations.
Application	Application 1: Calculations related to heat, air and moisture transfer as well as sound transmission in building materials, components, assemblies and their interfaces 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 cladding assemblies installed on buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] where: the cladding assembly is not addressed in Section 9.27., or the cladding assembly does not comply with the prescriptive requirements of Section 9.27. Application 3: 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: incorporates low permeance materials that act as other than cladding or that are installed on the warm side of the assembly, and is more susceptible to condensation [see Sentences 9.25.1.2.(4) and (5) for combinations of interior and exterior environmental conditions that create a higher risk for condensation]. Application 4: 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 the incorrect calculation of heat, air and moisture transfers, which could lead to the inadequate performance or premature failure of components and assemblies of environmental separators under expected environmental or structural loads, which could lead to: condensation, precipitation ingress, or moisture ingress from the ground. This is to limit the probability of: deterioration, which could lead to compromised structural integrity of the separators or of elements supported by the separators, and the freezing of soils on which foundations bear, which could lead to the displacement of structural elements. This is to limit the probability of structural failure, which could lead to harm to persons.
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