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9.13.2.5.(1)
ApplicationIntent
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F40-OH1.1] Applies to dampproofing installed to control the ingress of soil gas.
[F61-OH1.1,OH1.2,OH1.3] Applies to dampproofing installed to control the ingress of moisture.
Application
Application 1: 
Installation of dampproofing material over parging or concrete on walls below ground level that are in contact with the ground, where the ground level outside is higher than the ground level inside, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except as stated in:
  • Sentence 9.13.3.1.(1), which applies to foundation walls that are subject to hydrostatic pressure, and
  • Sentence 9.13.4.1.(2), which applies to the control of the infiltration of soil gas in
    • garages
    • unenclosed portions of buildings served by walls or roofs, and
    • buildings located where soil gas is at a sufficiently low concentration as to not constitute a hazard.
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Intent
Intent 1: 
To limit the probability of the ingress of moisture from the ground, not under hydrostatic pressure.
This is to limit the probability of:
  • compromised thermal performance of components intended to provide resistance to heat transfer, which could lead to an inadequate control of the temperature of interior spaces,
  • water accumulation or an inadequate control of relative humidity,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to compromised integrity of the walls.
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
Intent 2: 
Where dampproofing materials are installed to control the infiltration of soil gas, to limit the probability of the infiltration of soil gas, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.
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