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9.15.3.2.(2)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOS2 Structural Safety
Attribution
[F21-OS2.1]
[F21-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Granular fill under concrete footings of foundations for buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where the foundations are:
  • not subject to surcharge, and
  • erected on stable soils with:
    • for standard foundation construction and for buildings of wood-frame construction [see Article 9.23.1.1.] or masonry construction, an allowable bearing pressure of 75 kPa or greater, and
    • for flat insulating concrete form foundation walls and for buildings of light-frame construction [see Article 9.4.2.1.] or flat insulating concrete form construction that are not more than 2 storeys in building height, with a maximum floor-to-floor height of 3 m, and contain only a single dwelling unit, an allowable bearing pressure of 100 kPa or greater.
Exceptions: 
except as stated in Sentence 9.15.1.2.(1), which applies to foundations and footings for buildings erected on permafrost.
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Intent
Intent 1: 
To limit the probability that the weathering of pyritic material will lead to the heaving of footings, which could lead to the movement or cracking of foundation walls.
This is to limit the probability of:
  • structural collapse of the foundation or supported elements, or
  • where elements support or are part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements.
This is to limit the probability of harm to persons.
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