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9.15.2.3.(4)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOS3 Safety in Use
Attribution
[F20,F22-OS3.1] Applies to floors and elements that support floors.
Application
Application 1: 
Orientation of concrete blocks in pier-type foundations for buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are 1 storey in building height, 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 1 storey 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 of the inappropriate orientation of concrete blocks, which could lead to:
  • piers tilting or toppling, or
  • the structural failure of piers under gravity loads.
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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