Intent 1:
Where concrete supports or is used in the walls
of chimneys or fireplaces, to limit the probability of the inadequate
performance or premature failure of concrete under expected environmental
or structural loads, which could lead to the failure of these walls.
This is to limit the probability of the leakage of combustion
products, which could lead to negative effects on the air quality
of indoor spaces, which could lead to harm to persons.
Intent 2:
Where concrete supports or is used in an environmental
separator, to limit the probability of the inadequate performance
or premature failure of concrete under expected environmental or structural
loads.
This is to limit the probability of:
- the compromised integrity of the environmental separator,
or
- an inadequate resistance to air and moisture transfer
through the concrete.
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,
- 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:
- the generation of pollutants from biological growth
or from materials that become unstable on wetting,
- deterioration, which could lead to further compromised
integrity of environmental separators, or
- an inadequate control of indoor air and surface temperatures,
drafts, relative humidity, or water accumulation.
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.