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9.29.2.1.(1)
OH1OS2OS1OP2
ObjectiveOH1 Indoor Conditions
Attribution
[F80,F81-OH1.1,OH1.2] Applies where interior finishes support or serve as required environmental separation elements.
Application
Application 1: 
Minimum height of waterproof walls of shower stalls and around bathtubs, 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:
  • exposure of moisture-vulnerable interior finishes to water, which could lead to the ingress of water into wall assemblies, or
  • compromised thermal performance of components intended to provide resistance to heat transfer.
Where interior finishes support or serve as required environmental separation elements, this is to limit the probability of:
  • an inadequate control of temperatures of interior spaces or relative humidity,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • the deterioration of interior finishes, which could lead to compromised integrity of exterior walls or elements protected by exterior walls.
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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