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9.25.2.4.(4)
ApplicationIntent
OS2OH1+OS2OH1OP2OP3OS3OH4OS2OH1
ObjectiveOS3 Safety in Use
Attribution
(c) [F81-OS3.7] Applies where the interior finish provides the required bracing.
(c) [F81-OS3.1] Applies where the interior finish provides the required bracing of walls that support floors.
Application
Application 1: 
Installation of blown-in insulation in wood-frame walls separating heated space from unheated space or the exterior, in new 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:
  • inadequate fastening of or damage to the interior finish, or
  • inadequate protection of the insulation, air barrier system or vapour barrier, which could lead to condensation.
Where the interior finish contributes to the required bracing, this is to limit the probability of:
  • the inadequate performance of the interior finish, which could lead to an inability to resist expected lateral loads, which could lead to excessive racking, or
  • the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration, which could lead to compromised structural integrity.
This is to limit the probability of:
  • the excessive movement or deformation of walls, or
  • where the wall supports a floor, the excessive deflection or vibration of floors.
This is to limit the probability of:
  • compromised operation of doors or windows required for egress in an emergency, and
  • persons losing their balance, tripping or falling.
This is to limit the probability of harm to persons.
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