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9.15.3.8.(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: 
Minimum thickness of concrete footings not subject to surcharge, for foundations for buildings to which Section 9.15. applies [see Sentence 9.15.1.1.(1) for application of Section 9.15.].
Exceptions: 
except as stated in:
  • Sentence 9.15.1.2.(1), which applies to foundations and footings for buildings erected on permafrost, and
  • Sentence 9.15.1.3.(1), which applies to detached buildings whose superstructure conforms to the requirements of the deformation resistance test in CAN/CSA-Z240.2.1, “Structural Requirements for Mobile Homes.”
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Intent
Intent 1: 
To limit the probability of insufficiently thick concrete footings, which could lead to:
  • drying before hydration is complete, or
  • inadequate shear strength.
This is to limit the probability of weak concrete, which could lead to shear failure under gravity loads transmitted through foundation elements, which could lead to excessive settlement of the soil and structural damage to the foundation and the building.
Where elements support or are part of an environmental separator, this is to limit the probability of:
  • condensation,
  • rainwater 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 temperatures 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 elements supported by foundations, 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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