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9.29.5.9.(1)
OS2OP2OH1OS1OP1
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.3] Applies where interior finishes support or serve as required environmental separation elements.
Application
Application 1: 
Maximum spacing of screws in single-layer installations of gypsum board interior ceiling finishes on 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].
Exceptions: 
except as stated in Sentence 9.29.5.9.(2), which applies to perimeter fastening of ceiling sheets that are supported by the wall sheets around the perimeter of the ceiling.
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Intent
Intent 1: 
To limit the probability of inadequate support for gypsum board, which could lead to an inability to resist expected gravity loads.
This is to limit the probability of the deformation or detachment of interior finishes, which could lead to:
  • falling finishes, or
  • where interior finishes support or serve as required environmental separation elements, the excessive deformation, displacement or failure of such elements, which could lead to deterioration, which could lead to further compromised structural integrity.
This is to limit the probability of harm to persons.
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