9.18.2.1.(2)

Objective

OH1 Indoor Conditions

Attribution

[F51,F63-OS2.3]Applies where crawl spaces are unheated and access is from the interior.
[F42,F61-OS2.3]Applies where crawl spaces are heated or unheated and access is from the exterior.

Intent

Intent 1:

To limit the probability of unprotected access openings, which could lead to:

  • where crawl spaces are unheated and access is from the interior, moisture transfer from the interior, or
  • where crawl spaces are heated or unheated and access is from the exterior:
    • the ingress of precipitation,
    • an infestation of insects or vermin, or
    • compromised thermal performance of components intended to provide resistance to heat transfer.

This is to limit the probability of:

  • an inadequate control of the temperature of interior spaces, relative humidity or drafts,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to compromised integrity of environmental separators or of elements protected by the 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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