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9.23.13.6.(1)
ApplicationIntent
OS2OP2OH1
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1,OS2.3,OS2.5] [F22-OS2.3,OS2.5]
Application
Application 1: 
Minimum depth and thickness of hip and valley lumber rafters, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.].
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Intent
Intent 1: 
To limit the probability of inadequate depth or thickness, which could lead to an inability to resist expected gravity and lateral loads transferred from common rafters, which could lead to the excessive deflection of rafters, which could lead to damage to roofing.
This is to limit the probability of compromised structural integrity, which could lead to:
  • the structural collapse of wood-frame construction,
  • where roof and ceiling framing members support required elements of environmental separators, the excessive deformation, displacement or failure of these elements, which could lead to deterioration, which could lead to further compromised structural integrity of roofs or environmental separators, or
  • where roof and ceiling framing members support assemblies exposed to the exterior, excessive water ingress, which could lead to deterioration.
This is to limit the probability of harm to persons.
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