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9.25.2.4.(4)
ApplicationIntent
OS2OH1+OS2OH1OP2OP3OS3OH4OS2OH1
ObjectiveOH1 Indoor Conditions
Attribution
(c) [F81-OH1.1,OH1.2]
(c) [F81-OH1.1,OH1.2,OH1.3] Applies where the interior finish provides the required bracing.
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 protection of the insulation, air barrier system or vapour barrier, or
  • where the interior finish contributes to the required bracing, the inadequate performance of the interior finish, which could lead to an inability to resist expected lateral loads, which could lead to excessive racking.
This is to limit the probability of the failure of required environmental separation elements, which could lead to:
  • condensation,
  • precipitation ingress,
  • pollutant ingress, or
  • compromised thermal performance of components intended to resist heat transfer.
This is to limit the probability of:
  • an inadequate control of temperatures, drafts, relative humidity or water accumulation in interior spaces,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to further compromised integrity of environmental separators.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, or
  • contact with moisture.
This is to limit the probability of harm to persons.
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