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5.2.1.2.(1)
ApplicationIntent
OH1OS2OS1
ObjectiveOS1 Fire Safety
Attribution
[F51,F61,F63,F55-OS1.4] Applies where required life safety systems are incorporated in environmental separators.
Application
Application 1: 
Determination of interior environmental loads on 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 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 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 that inappropriate assumptions will be made with regard to interior environmental load in the design of environmental separators, which could lead to the inadequate performance or premature failure of components and assemblies of environmental separators under expected environmental loads, which could lead to:
  • air infiltration and exfiltration,
  • excessive heat loss,
  • condensation, or
  • precipitation ingress.
Where life safety systems are required to be installed in environmental separators, this is to limit the probability of compromised operation of temperature-sensitive or moisture-sensitive life safety systems, which could lead to harm to persons.
Intent 2: 
To direct Code users to a source of information commonly used for defining interior environmental loads.
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