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9.15.4.1.(1)
ApplicationIntent
OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F22,F63,F55-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Insulating concrete form units for use in flat insulating concrete form foundation walls 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 are:
  • erected on stable soils with an allowable bearing pressure of 100 kPa or greater, and
  • for buildings of light-frame construction [see Article 9.4.2.1.] or flat insulating concrete form construction that are not more than 2 storeys in building height, with a maximum floor-to-floor height of 3 m, and contain only a single dwelling unit.
Exceptions: 
except as stated in:
  • Sentence 9.15.1.2.(1), which applies to foundations and footings for buildings erected on permafrost, and
  • Sentence 9.15.1.3.(1), which applies to detached buildings whose superstructure conforms to the requirements of the deformation resistance test in CAN/CSA-Z240.2.1, “Structural Requirements for Mobile Homes.”
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Intent
Intent 1: 
To limit the probability that the performance of form material for use in flat insulating concrete form foundation walls will fall significantly below expectations, which could lead to:
  • the dislodgement or failure of form material,
  • the excessive sagging and misalignment or opening of joints,
  • excessively low temperatures of interior surfaces or within assemblies, or
  • an inadequate resistance to air and moisture transfer.
Where elements support or are part of an environmental separator, this is to limit the probability of:
  • condensation,
  • rainwater ingress,
  • the ingress of moisture from the ground, 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
  • compromised integrity of elements supported by foundations, which could lead to the deterioration of building elements.
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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