Sentence 9.4.4.6.(2)

Intent 1:

To limit the probability that any surcharge on the foundation walls will not be included in the design pressures, which could lead to the walls being unable to resist 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, or 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 other than drained earth that are not constructed in accordance with Section 9.15.