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9.15.2.4.(1)
ApplicationIntent
OS2OP2OH1OH4OS3+
ObjectiveOS2 Structural Safety
Attribution
(a) [F20-OS2.1,OS2.2]
(a) [F20,F80-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Foundations of wood-frame construction 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 buildings of wood-frame construction [see Article 9.23.1.1.], an allowable bearing pressure of 75 kPa or greater, 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 performance of wood-frame foundations will fall significantly below expectations, which could lead to an inability to support vertical building loads or lateral earth loads, which could lead to damage to the foundation and the superstructure.
This is to limit the probability of compromised structural integrity, which could lead to:
  • structural failure, 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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