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5.10.1.1.(1)
ApplicationIntent
OH1OS2OS3OH4OS1
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1] [F51,F61,F63,F80-OS2.3] [F51-OS2.5]
Application
Application 1: 
Performance criteria and installation methods for materials, components and their connections, for which a standard is listed in Table 5.10.1.1.
This applies to 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].
Exceptions: 
except as stated in:
  • Sentence 5.10.1.1.(2), which applies where the requirements of the standard pertain to the flame-spread properties of materials and components,
  • Sentence 5.10.1.1.(3), which exempts wired glass assemblies (windows) installed in a required fire separation from the application of CAN/CSA-A440, “Windows,” and CAN/CSA-440.1, “User Selection Guide to CSA Standard CAN/CSA-A440-00, Windows,” and
  • Sentence 5.10.1.1.(4), which applies to skylights not covered in the scope of CAN/CGSB-63.14-M, “Plastic Skylights.”
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Intent
Intent 1: 
To limit the probability that the performance of materials and components and their installation will fall significantly below expectations, with respect to the structural integrity, which could lead to structural failure, which could lead to harm to persons.
Intent 2: 
To limit the probability that the performance of materials and components and their installation will fall significantly below expectations, with respect to:
  • their resistance to:
    • condensation
    • the ingress of precipitation, water or moisture from the exterior or from the ground,
    • excessive heat loss or gain, or
    • premature deterioration, or
  • metallic components of environmental separators being corroded by chemicals in the cellulose (CAN/ULC-S703).
This is to limit the probability of damage to or deterioration of environmental separation elements, which could lead to compromised structural integrity of such elements, which could lead to structural failure, which could lead to harm to persons.
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