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9.15.5.3.(2)
OH1OS2OP2OH4OS3
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: 
Pilasters for beams that frame into unit masonry foundation walls that are 140 mm or less in thickness, on soils having an allowable bearing pressure of 75 kPa or greater, for buildings of wood-frame or masonry construction 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 9.15.1.2.(1), which applies to buildings that are erected on permafrost.
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Intent
Intent 1: 
To limit the probability of inadequate dimensions or an inadequate connection to walls, which could lead to the structural failure of pilasters.
Where elements support or are part of an environmental separator, this is to limit the probability of damage to the foundation or the superstructure, which could lead to:
  • 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 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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