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9.23.13.8.(5)
ApplicationIntent
OS2OP2OH1OS1OS3
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1,OS2.3,OS2.5] [F22-OS2.3,OS2.5]
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 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.
This is to limit the probability of compromised structural integrity, which could lead to:
  • the structural collapse of wood-frame construction,
  • where supporting walls serve as an environmental separator or where roof and ceiling framing members support elements of an environmental separator, the excessive deformation, displacement or failure of required environmental separation 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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