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9.15.4.2.(4)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOS3 Safety in Use
Attribution
[F20,F22-OS3.1] Applies to floors and elements that support floors.
Application
Application 1: 
Thickness and reinforcing of unit masonry foundation walls made of concrete block that are subject to lateral earth pressure and erected on average stable soils having an allowable bearing pressure of 75 kPa or greater, where the wind loads on the exposed portion of the foundation do not exceed 0.7 kPa, 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 foundations and footings for buildings erected on permafrost, and
  • Sentence 9.15.1.3.(1), which applies to detached buildings whose superstructure conforms to the requirements of the deformation resistance test in CAN/CSA-Z240.2.1, “Structural Requirements for Mobile Homes.”
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Intent
Intent 1: 
To limit the probability of insufficiently thick and inadequately reinforced foundation walls, which could lead to an inability to support lateral earth loads, which could lead to masonry cracking.
This is to limit the probability of:
  • compromised structural integrity, 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.
For floors and elements supporting floors, this is to limit the probability of excessive deflection, which could lead to rough or uneven walking surfaces, which could lead to persons tripping or falling, which could lead to harm to persons.
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