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5.3.1.1.(1)
ApplicationIntent
OH1OS2OS1
ObjectiveOS2 Structural Safety
Attribution
[F63-OS2.3]
Application
Application 1: 
Installation of:
  • building materials that resist heat transfer through building components and assemblies, and through interfaces between components and assemblies, or
  • means to dissipate transferred heat from within assemblies to the outside.
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].
Exceptions: 
except as stated in Sentence 5.3.1.1.(2), which applies where an inadequate resistance to heat transfer or inadequate means to dissipate heat 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 the inadequate control of heat transfer through environmental separators under expected environmental loads, which could lead to:
  • the condensation of moisture from interior spaces on warm-side surfaces, and
  • the creation of ice dams.
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, which could lead to structural failure, which could lead to harm to persons.
Intent 2: 
To limit the probability of the inadequate control of heat transfer through environmental separators under expected environmental loads, which could lead to the freezing of soils on which foundations bear, which could lead to the displacement of structural elements, which could lead to structural failure, which could lead to harm to persons.
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