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9.13.3.4.(2)
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F40-OH1.1] Applies where waterproofing materials are installed to control the infiltration of soil gas.
Application
Application 1: 
Sealing of holes and recesses in cast-in-place concrete walls that are in contact with the ground and that are subject to hydrostatic pressure, 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 9.13.4.1.(2), which applies to the control of the infiltration of soil gas in:
  • garages,
  • unenclosed portions of buildings served by such walls, 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 an inadequate substrate, which could lead to discontinuity in the waterproofing, which could lead to:
  • the ingress of moisture from the ground, or
  • compromised thermal performance of components intended to provide resistance to heat transfer.
This is to limit the probability of:
  • an inadequate control of the temperature of interior spaces, relative humidity, or water ingress and 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 walls or of elements protected by 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 waterproofing materials are installed to control the infiltration of soil gas, to limit the probability of an inadequate substrate, which could lead to discontinuity in the waterproofing, which could lead to 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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