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9.20.17.1.(1)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOS3 Safety in Use
Attribution
[F20,F22-OS3.1] Applies to floors and elements that support floors.
[F20,F22-OS3.7] Applies to walls, and elements that support walls, that contain doors or windows required for emergency egress.
Application
Application 1: 
Thickness of concrete in flat insulating concrete form walls not in contact with the ground, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where:
  • the floor-to-floor height is not greater than 3 m,
  • the buildings are not more than 2 storeys in building height and they contain only a single dwelling unit, and
  • the buildings are erected in locations where the seismic spectral response acceleration, Sa(0.2), is not greater than 0.4.
Exceptions: 
except as stated in Sentence 9.20.1.1.(2), which applies to insulating concrete form walls other than those described above, or where the walls are designed for specified loads on the basis of ultimate and serviceability limit states.
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Intent
Intent 1: 
To limit the probability of an insufficient thickness of concrete in walls, insufficient bearing of supported walls, or eccentric loads on the wall, which could lead to an inadequate resistance to lateral earth pressure or an inability to support transverse or gravity loads, which could lead to concrete cracking.
This is to limit the probability of:
  • compromised structural integrity of masonry construction,
  • where masonry construction is part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to deterioration, or
  • an inability to resist expected loads, which could lead to excessive deflection or vibration of floors.
This is to limit the probability of:
  • for floors and elements supporting floors, persons losing their balance, tripping or falling, or
  • the compromised operation of doors or windows required for egress in an emergency.
This is to limit the probability of harm to persons.
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