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9.15.4.7.(1)
OS2OP2OH1OH4OS3
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Dimensions of reduced sections of solid concrete and unit masonry foundation walls that are installed on soils having an allowable bearing pressure of 75 kPa or greater, where the tops of the walls are reduced in thickness to permit the installation of floor joists, 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 excessive height or inadequate thickness of thin portions of concrete or unit masonry foundation walls, which could lead to inadequate strength, which could lead to an inability to support expected vertical loads, which could lead to structural damage to the foundation and the building.
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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