9.25.1.1.(2)

Objective

OH1 Indoor Conditions

Attribution

Intent

Intent 1:

To limit the probability of:

  • excessively low temperatures of interior surfaces or within wall, ceiling or floor assemblies, which could lead to condensation,
  • excessive air infiltration and exfiltration,
  • excessive airborne vapour transfer from interior above ground and exterior below ground,
  • precipitation ingress due to air pressure differences,
  • uncontrolled diffusion of water vapour from air in heated space into insulated wall, ceiling and floor assemblies, which could lead to condensation,
  • inadequate moisture diffusion, venting, or drainage of moisture to the exterior, which could lead to condensation, 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 or relative humidity, or water accumulation,
  • pollutant ingress from the exterior, including combustion products from parking garages, or 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 assemblies acting as 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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