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9.14.2.1.(2)
ApplicationIntent
OH1OS2OS2OP2OH1OH4OS3
ObjectiveOH1 Indoor Conditions
Attribution
(a) [F60-OH1.1,OH1.2,OH1.3] Applies where foundations serve as or support an environmental separator.
Application
Application 1: 
Mineral fibre insulation or crushed rock backfill that is installed adjacent to the exterior surface of foundation walls of buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except for:
  • the foundation walls of crawl spaces whose exterior walls have 25% or more of their total area above exterior ground level open to the outdoors [see Sentence 9.18.1.1.(1)] and where drainage can be shown to be unnecessary [see Sentences 9.18.5.1.(1) and (2)],
  • foundation walls that are subject to continuous hydrostatic pressure, and
  • foundation walls that are effectively drained by the native soil or that have otherwise demonstrated that they do not require drainage.
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Intent
Intent 1: 
To limit the probability of inadequate drainage, which could lead to a perched water table, which could lead to the accumulation of water under hydrostatic pressure, which could lead to excessive moisture loading on foundation walls.
This is to limit the probability of:
  • the ingress of moisture from the ground, or
  • movement or cracking of the foundation wall or building superstructures, which could lead to, for environmental separators or elements supporting environmental separators, the displacement or failure of required environmental separation elements.
This is to limit the probability of:
  • excessive heat transfer,
  • pollutant ingress (from the exterior or from adjacent interior space, including soil gas, combustion products from parking garages, and particulates),
  • precipitation ingress,
  • condensation, or
  • moisture ingress from the ground.
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
  • deterioration, which could lead to compromised integrity of elements supported by foundation walls.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • inadequate thermal comfort of persons, and
  • contact with moisture.
This is to limit the probability of harm to persons.
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