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9.29.5.4.(1)
OS2OH1OS1OP2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Minimum thickness of single-layer installations of gypsum board interior wall and ceiling finishes that support insulation and are nailed or screwed to wood furring or framing, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of insufficent strength, which could lead to an inability to resist expected gravity loads, which could lead to the excessive sagging of gypsum board.
This is to limit the probability of the deformation or detachment of interior finishes, which could lead to:
  • the excessive deformation, displacement or failure of environmental separation elements (such as insulation), which could lead to deterioration, which could lead to compromised structural integrity of the assembly, or
  • where interior finishes contribute to the required bracing or lateral support for studs, the buckling or racking of walls, which could lead to structural failure.
This is to limit the probability of harm to persons.
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