1. OH1
  2. OS2
  3. OS1


OH1 Indoor Conditions



Intent 1:

To limit the probability that the airtightness of the installed materials will be inadequate for the control of:

  • heat loss or gain due to air mass transfer,
  • air infiltration and exfiltration,
  • airborne vapour transfer from the interior above ground and from the exterior below ground,
  • precipitation ingress due to air pressure differences, or
  • the condensation of moisture from interior spaces on interior surfaces or within assemblies.

This is to limit the probability of:

  • pollutant ingress, including soil gas, combustion products from parking garages, and particulates,
  • the inadequate control of temperatures of interior spaces, drafts, indoor relative humidity, or
  • water accumulation.

This is to limit the probability of:

  • the generation of pollutants from biological growth, or from materials that become unstable on wetting, or
  • deterioration, further compromising the integrity of the separator.

This is to limit the probability of:

  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, or
  • contact with moisture.

This is to limit the probability of harm to persons.

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