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9.20.17.6.(1)
ApplicationIntent
OS2OP2OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F20,F22-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Anchorage of top plates supporting roof framing supported on the top of 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 that anchor bolts of insufficient size will be used and spaced too far apart, which could lead to the roof framing becoming detached from the insulating concrete form walls, which could lead to an inability to resist expected gravity and lateral loads.
Where elements support or are part of an environmental separator, this is to limit the probability of the excessive deformation, displacement or failure of required environmental separation elements, which could lead to:
  • condensation,
  • rainwater ingress,
  • the ingress of moisture, or
  • compromised thermal performance of components intended to provide resistance to heat transfer.
This is to limit the probability of:
  • an inadequate control of temperatures of interior spaces, 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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