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9.15.3.7.(1)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOS3 Safety in Use
Attribution
[F20,F21-OS3.1] Applies to floors and elements that support floors.
Application
Application 1: 
Minimum area for concrete footings for columns, where column spacing is other than 3 m, for foundations 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:
  • the footings support floors and roofs of light wood-frame construction [see Article 9.4.2.1.],
  • the span of supported joists does not exceed 4.9 m, and
  • the specified live load on any floor supported by the footings does not exceed 2.4 kPa.
Exceptions: 
except as stated in:
  • Sentence 9.15.1.2.(1), which applies to foundations and footings for buildings erected on permafrost,
  • Sentence 9.15.3.4.(2), which applies to joist spans exceeding 4.9 m in buildings with light wood-frame walls, floors and roofs, and
  • Sentence 9.15.3.4.(3), which applies to foundations resting on gravel, sand or silt in which the water table level is located less than the width of the footings below the bearing surface.
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Intent
Intent 1: 
To limit the probability of an insufficient plan area for column footings, which could lead to an inability to resist expected gravity loads, which could lead to compressive failure and excessive settlement of underlying soil, which could lead to structural damage to the foundation and the building, which could lead to an inability to support vertical building loads or lateral earth 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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