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9.23.11.3.(3)
OS2OP2OH1OS1OH4OS3
ObjectiveOS1 Fire Safety
Attribution
[F20,F22-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Minimum number of top wall plates in loadbearing stud walls where the studs are not more than 50 mm to one side of the supported framing above and in non-loadbearing stud walls, 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 capacity to transfer loads from supported floor and roof framing members in construction where supported loads are transferred directly to the studs or where the supported load is limited, which could lead to an inability to resist expected gravity and lateral loads, which could lead to:
  • the inadequate distribution of vertical loads to and from studs, which could lead to the excessive deflection of wall plates, or
  • inadequate diaphragm action of plates, which could lead to the excessive deflection of walls.
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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