9.13.3.4.(1)

Intent 1:

To limit the probability of an inadequate substrate, 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.

Intent 3:

Where waterproofing materials are installed to control the infiltration of soil gas, to limit the probability of an inadequate substrate, which could lead to discontinuity in the waterproofing, which could lead to the infiltration of soil gas, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.