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5.8.1.1.(1)
OH1OS2+
ObjectiveOH1 Indoor Conditions
Attribution
[F60-OH1.1,OH1.2,OH1.3] Applies to portion of Code text: “… the bottom of every exterior foundation wall and every floor-on-ground shall be provided with drainage.”
Application
Application 1: 
Drainage for exterior foundation walls and floors-on-ground.
This applies to building materials, components or assemblies and their interfaces described in Sentence 5.1.2.1.(1) that are installed in buildings to which Part 5 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 5].
Exceptions: 
except where:
  • the foundation wall or floor is subject to continuous hydrostatic pressure, or
  • drainage can be shown to be unnecessary.
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Intent
Intent 1: 
To limit the probability of excessive moisture loading on below-ground assemblies, which could lead to moisture ingress from the ground.
This is to limit the probability of:
  • 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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