ARCHIVED - 5.1.4.2.(1)

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5.1.4.2.(1)


Objective	OH1 Indoor Conditions
Attribution	[F80,F81-OH1.1,OH1.2,OH1.3]
Application	Application 1: Resistance to deterioration and material compatibility of 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) et (3) for combinations of interior and exterior environmental conditions that create a higher risk for condensation]. Exceptions: except as stated in Sentence 5.1.4.2.(2), which applies where the incompatibility of materials or an inadequate resistance to deterioration will not negatively affect health, safety, the intended use of the building or the operation of building services.
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Intent	Intent 1: To limit the probability of material incompatibility or a high rate of deterioration under expected environmental or structural loads, which could lead to the premature failure of components and assemblies of environmental separators. This is to limit the probability of: air infiltration and exfiltration, condensation, precipitation ingress, moisture ingress from the ground, or pollutant ingress, including soil gas, combustion products from parking garages, or particulates. This is to limit the probability of: the inadequate control of temperatures of interior spaces, drafts, relative humidity or water accumulation, the generation of pollutants from biological growth or from materials that become unstable on wetting, or deterioration, which could lead to further compromised integrity of environmental separators. This is to limit the probability of: negative effects on the air quality of indoor spaces, the inadequate thermal comfort of persons, and contact with moisture. This is to limit the probability of harm to persons.
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