1. OH1
  2. OS2


OH1 Indoor Conditions



Intent 1:

To limit the probability of an inadequate substrate, which could lead to improper application of the waterproofing, which could lead to discontinuity in the waterproofing, which could lead to:

  • the ingress of moisture from the ground, including water that is under hydrostatic pressure, 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, relative humidity, or water ingress and 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 walls or of elements protected by the 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 Subsection 9.20.3. to include parging on masonry below ground that is applied as a substrate for waterproofing.

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