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9.23.13.3.(1)
ApplicationIntent
OS2OP2OS1OH1
ObjectiveOS1 Fire Safety
Attribution
[F20,F22-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Minimum length of end bearing of lumber roof rafters, roof joists and ceiling joists, 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 support for roof joists and rafters, which could lead to an inability to resist expected gravity loads, which could lead to crushing, or
  • insufficient area for fastening, which could lead to an inability to resist expected lateral or wind-uplift loads, which could lead to the separation of roofs from walls.
Where assemblies are required to provide fire resistance, this is to limit the probability of compromised fire resistance of the assembly, which could lead to harm to persons.
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