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5.7.1.1.(3)
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Building location, site grading, installation of catch basins on the building site, and construction of foundation walls, where it can be demonstrated that the building is designed to accommodate extended exposure to water or the ingress of water.
This applies to buildings to which Part 5 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 5].
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Intent
Intent 1: 
To exempt from the application of Sentence 5.7.1.1.(1) and Clause 5.7.1.1.(2)(a) buildings that are specifically designed to accommodate the accumulation of water at the building or the ingress of water.
Intent 2: 
To limit the probability of damage to moisture-susceptible materials, which could lead to:
  • the inadequate control of relative humidity or water accumulation,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to 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, and
  • contact with moisture.
This is to limit the probability of harm to persons.
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