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  2. OS2
  3. OH1
  4. OS2
  5. OH1


OH1 Indoor Conditions



Intent 1:

To limit the probability of using insufficient time periods to assess proven past performance for the installation of environmental separation elements that are subject to structural loads.

This is to limit the probability of insufficient capacity and integrity of such elements to resist or accommodate such loads, which could lead to damage to and deterioration of building elements, which could lead to:

  • air infiltration and exfiltration,
  • condensation,
  • precipitation ingress,
  • moisture ingress from the ground, or
  • pollutant ingress, including soil gas, combustion products from parking garages, or particulates.

This is to limit the probability of:

  • the 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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