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9.23.15.5.(1)
ApplicationIntent
OS2OP2OH1OS1
ObjectiveOS1 Fire Safety
Attribution
[F20,F22-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Maximum width, end support and end joints for lumber roof sheathing, 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:
  • excessive width, which could lead to excessive shrinkage, which could lead to:
    • buckling or tearing of roofing, or
    • excessively wide gaps between boards, which could lead to puncturing of roofing,
  • unsupported end joints, which could lead to an inability to resist point loads from foot traffic, which could lead to differential deflection of unsupported sheathing board ends, which could lead to damage to roofing, and
  • aligned end joints, which could lead to discontinuity in the roof structure, which could lead to an inability to resist expected lateral or gravity loads, which could lead to excessive deflection, 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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