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9.23.13.7.(6)
OP2OH1OS2OH4OS1OS3
ObjectiveOS1 Fire Safety
Attribution
[F20,F22-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Blocking for floor joists supporting dwarf walls that support lumber rafters and enclose finished rooms, 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 load distribution among floor joists,
  • inadequate backing for insulation, or
  • inadequate support for air barrier systems.
This is to limit the probability of an inability to resist expected gravity loads.
Where assemblies are required to provide fire resistance, this is to limit the probability of excessive deflection of the roof, which could lead to compromised fire resistance of the assembly, which could lead to harm to persons.
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