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


OH1 Indoor Conditions



Intent 1:

To limit the probability that using inappropriate design pressures will lead to the walls being unable to resist expected lateral pressure, which could lead to the cracking of foundations or building superstructures.

For walls serving as an environmental separator or supporting an environmental separator, this is to limit the probability of:

  • 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 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,
  • 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 Section 4.2. to walls supporting drained earth that are not constructed in accordance with Section 9.15.

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