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9.23.12.3.(2)
OS2OP2OH1OH4OS1OS3
ObjectiveOS1 Fire Safety
Attribution
[F20,F22-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Minimum dimensions, orientation and fastening of wood lintels in loadbearing, 38 mm by 64 mm 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 insufficiently thick lintel members or of inadequate fastening of double-member lintels, which could lead to inadequate load distribution, 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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