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


OH1 Indoor Conditions


(a) [F60-OH1.1,OH1.2,OH1.3]Applies where foundations serve as or support an environmental separator.


Intent 1:

To limit the probability of inadequate drainage, which could lead to a perched water table, which could lead to the accumulation of water under hydrostatic pressure, which could lead to excessive moisture loading on foundation walls.

This is to limit the probability of:

  • the ingress of moisture from the ground, or
  • movement or cracking of the foundation wall or building superstructures, which could lead to, for environmental separators or elements supporting environmental separators, the displacement or failure of required environmental separation elements.

This is to limit the probability of:

  • excessive heat transfer,
  • pollutant ingress (from the exterior or from adjacent interior space, including soil gas, combustion products from parking garages, and particulates),
  • precipitation ingress,
  • condensation, or
  • moisture ingress from the ground.

This is to limit the probability of:

  • an inadequate control of the temperature of interior spaces, 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 elements supported by foundation walls.

This is to limit the probability of:

  • negative effects on the air quality of indoor spaces,
  • inadequate thermal comfort of persons, and
  • contact with moisture.

This is to limit the probability of harm to persons.

Top of Page