1. OS2
  2. OH1
  3. OH4


OH1 Indoor Conditions



Intent 1:

To limit the probability of using inappropriate wind load assumptions, which could lead to the deflection, movement and deterioration of required environmental separation elements subject to wind load, which could lead to the failure of such elements, which could lead to the inadequate control of:

  • the total heat loss or gain due to air mass transfer or conduction,
  • 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
  • condensation.

This is to limit the probability of:

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

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.

Intent 2:

To expand the application of Article to wind loads on elements identified in Sentences and, with respect to the direct implications of non-compliance with the objectives of Structural Safety and Structural Sufficiency of the Building.

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