1. OH1
  2. OS2
  3. OS3
  4. OH4
  5. OS1
  6. OP2
  7. OH2


OH1 Indoor Conditions



Intent 1:

To limit the probability that the performance of materials and components and their installation will fall significantly below expectations, with respect to:

  • their resistance to:
    • condensation,
    • excessive heat transfer,
    • precipitation ingress,
    • the ingress of moisture from the ground,
    • the ingress of water from the surface, or
    • air infiltration and exfiltration, or
  • the emission of gases from improperly constituted or applied material (CAN/ULC-S705.2).

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,
  • deterioration, which could lead to further compromised integrity of environmental separators, or
  • pollutant ingress, including soil gas, combustion products from parking garages, or particulates.

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.

Top of Page