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9.23.13.10.(2)
ApplicationIntent
OS2OP2OH1OS1
ObjectiveOP2 Structural Sufficiency of the Building
Attribution
[F20-OP2.1,OP2.3,OP2.5] [F22-OP2.3,OP2.5]
Application
Application 1: 
Minimum depth of lumber ceiling joists supporting struts or dwarf walls that in turn support roof rafters, where the roof slope is 1 in 4 or less, 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 strength, which could lead to an inability to resist bending stress imposed by struts or dwarf walls in addition to other expected gravity and lateral loads, which could lead to:
  • the failure of the roof or of the ceiling joists, or
  • the excessive deflection of the roof, which could lead to the opening of joints.
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 damage to the building.
Intent 2: 
To limit the application of Sentence (1) for constructions where support for increased roof loads has to be provided.
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