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


OH1 Indoor Conditions


[F20-OH1.1,OH1.2,OH1.3]Applies where wood-frame floors-on-ground serve as an environmental separator.


Intent 1:

To limit the probability that the structural performance of floors-on-ground will fall significantly below expectations, which could lead to an inadequate resistance to gravity loads or lateral soil loads, which could lead to damage to floors or foundation walls.

Where wood-frame floors serve as an environmental separator, this to limit the probability of:

  • condensation,
  • precipitation ingress,
  • the ingress of moisture from the ground, or
  • the compromised thermal performance of components intended to provide resistance to heat transfer.

This is to limit the probability of:

  • an inadequate control of temperatures in 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 protected by floors-on-ground.

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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