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9.20.17.1.(1)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOH1 Indoor Conditions
Attribution
[F20,F22-OH1.1,OH1.2,OH1.3] Applies to elements that support or are part of an environmental separator.
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.
Where flat insulating concrete form walls support or are part of an environmental separator, this is to limit the probability of deformation or cracking, which could lead to the excessive deformation, displacement or failure of required environmental separation elements.
This is to limit the probability of:
  • condensation,
  • precipitation ingress,
  • moisture ingress,
  • pollutant ingress, or
  • compromised thermal performance of components intended to resist heat transfer.
This is to limit the probability of:
  • an inadequate control of temperatures of interior spaces, drafts, relative humidity or water accumulation,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to further compromised integrity of environmental separators.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, and
  • contact with moisture.
This is to limit the probability of harm to persons.
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