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9.23.12.3.(1)
ApplicationIntent
OS2OP2OH1OH4OS1OS3
ObjectiveOS1 Fire Safety
Attribution
[F20,F22-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Maximum spans for wood lintels, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.]:
  • in buildings of residential occupancy,
  • where wall studs exceed 38 mm by 64 mm in size,
  • where the spans of supported joists do not exceed 4.9 m, and
  • where the spans of trusses do not exceed 9.8 m.
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Intent
Intent 1: 
To limit the probability of excessively long spans, which could lead to an inability to resist expected gravity and lateral loads around openings.
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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