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9.12.2.1.(1)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOH1 Indoor Conditions
Attribution
[F20-OH1.1,OH1.2,OH1.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Excavations for the foundations of buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability that foundations will be installed on loose soil which has a lower bearing capacity than expected, which could lead to the undue subsidence of soil beneath foundations, which could lead to excessive stress on foundations, which could lead to structural damage to foundations and superstructures.
For foundation walls or elements supported by foundation walls, this is to limit the probability of:
  • condensation,
  • precipitation ingress,
  • 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 accumulation,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • compromised integrity of foundation walls or elements supported by foundation walls, which could lead to the deterioration of building elements.
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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