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9.30.1.2.(1)
OS2OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F41,F81-OH1.1] Applies where finished flooring is required to provide water resistance.
Application
Application 1: 
Moisture protection of subfloors in bathrooms, kitchens, public entrance halls and laundry areas, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where a water permeable finish is supported by a subfloor of a type that would be damaged by water.
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Intent
Intent 1: 
To limit the probability of the inadequate protection of subfloors, which, on repeated exposure to water, could lead to:
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • the deterioration of the subfloor.
This is to limit the probability of negative effects on the air quality of indoor spaces, which could lead to harm to persons.
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