1. OS2
  2. OH1


OH1 Indoor Conditions



Intent 1:

To limit the probability of uncontrolled air leakage and uncontrolled vapour diffusion between walls and windows or doors, and between ceilings and skylights, which could lead to

  • condensation on the surface of building elements or within building elements,
  • excessive heat loss or gain,
  • precipitation ingress, or
  • ingress of insect and vermin.

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 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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