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9.23.13.8.(5)
OS2OP2OH1OS1OS3
ObjectiveOS1 Fire Safety
Attribution
[F20,F22-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Material and fastening of ties for lumber rafters and roof joists installed in lieu of ridge supports, 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 ties of inadequate strength, which could lead to ties or rafter-to-joist connections being unable to resist the tension forces imposed by expected gravity and lateral loads, which could lead to the lower end of rafters or joists moving outward, which could lead to:
  • the failure of roof rafters or joists, or supporting walls, or
  • the excessive deflection of roof rafters or joists, which could lead to damage to roofing.
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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