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5.6.1.2.(1)
ApplicationIntent
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
[F20,F61-OS2.3]
Application
Application 1: 
Grades of western cedar shakes and shingles installed to provide protection from precipitation on sloped or horizontal assemblies exposed to precipitation.
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.
Exceptions: 
except as stated in:
  • Sentence 5.6.1.1.(2), which applies where it can be shown that a lack of protection from precipitation ingress will not adversely affect health, safety, the intended use of the building or the operation of building services, and
  • Sentence 5.6.1.2.(2), which applies where western cedar shakes or shingles are installed as undercoursing.
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Intent
Intent 1: 
To limit the probability of defects such as knots, holes, decay, shake, wane and checks, crimps and sapwood, which could lead to a reduction in the watertightness of shingles and shakes, which could lead to precipitation ingress, which could lead to deterioration, which could lead to the structural failure, which could lead to harm to persons.
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