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9.23.13.7.(1)
ApplicationIntent
OS2OP2OH1OS1
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1,OS2.3,OS2.5] [F22-OS2.3,OS2.5]
Application
Application 1: 
Collar ties or ceiling joists providing intermediate support for roof rafters or joists, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.], where the roof slope is 1 in 3 or greater.
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Intent
Intent 1: 
To limit the probability of inadequate strength of intermediate support for rafters, which could lead to an inability to resist expected compressive loads transferred from opposing rafters, which could lead to failure of intermediate support members.
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
Intent 2: 
To further define the application of the span tables.
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