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9.15.4.2.(2)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOS3 Safety in Use
Attribution
[F20,F22-OS3.1] Applies to floors and elements that support floors.
Application
Application 1: 
Minimum thickness of concrete in flat insulating concrete form foundation walls not subject to surcharge, for buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], that are:
  • erected on stable soils with an allowable bearing pressure of 100 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.
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 of insufficiently thick concrete in foundation walls, which could lead to insufficient bearing of supported walls or eccentric loads on the foundation, which could lead to an inability to support gravity loads or lateral earth loads, which could lead to concrete 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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