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9.23.10.3.(3)
OS2OH1OP2OS1OS3
ObjectiveOS1 Fire Safety
Attribution
[F20,F22-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Orientation of wall studs, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.], that support only a load from an attic not accessible by a stairway, where:
  • the portion of the roof supported by the studs does not exceed 2.1 m in width,
  • the minimum stud size, maximum stud spacing, and maximum unsupported stud height do not exceed the limits stated in Table 9.23.10.1., and
  • the studs are clad on not less than one side with plywood, OSB or waferboard fastened with structural adhesive.
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Intent
Intent 1: 
To limit the probability that studs installed 'on the flat' will not act compositely with the sheathing and will be subject to excessive gravity and lateral loads, which could lead to an inability to resist expected gravity and lateral loads.
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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