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9.29.3.1.(1)
OS2OH1OS1OP2
ObjectiveOH1 Indoor Conditions
Attribution
[F20,F22-OH1.1,OH1.2] Applies where interior finishes support or serve as required environmental separation elements.
Application
Application 1: 
Wood furring for the attachment of interior wall and ceiling finishes, 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 inadequate strength or rigidity, which could lead to an inability to resist expected impact, gravity or lateral loads, which could lead to splitting, excessive deflection, bending failure or the withdrawal of fasteners.
Where interior finishes support or serve as required environmental separation elements, this is to limit the probability of the deformation or detachment of interior finishes, which could lead to 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 of interior spaces,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • the deterioration of interior finishes.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces, or
  • the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.
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