Intent 1:
To limit the probability that performance, with
respect to loadbearing capacity, water transfer and freeze-thaw resistance,
will fall significantly below expectations, which could lead to an
inability to resist expected gravity or lateral loads, as well as
moisture or temperature loads.
This is to limit
the probability of:
- excessive moisture transfer through masonry units, or
- deformation or cracking, which could lead to:
- where masonry units support or are part of an environmental
separator, the excessive deformation, displacement or failure of required
environmental separation elements, or
- where masonry is used in chimneys and fireplaces, compromised
integrity of chimneys or fireplaces.
This is to limit the probability of:
- condensation,
- precipitation ingress,
- moisture ingress,
- excessive heat transfer,
- pollutant ingress, or
- compromised thermal performance of components intended
to resist heat transfer.
This is to limit the probability of:
- an inadequate control of temperatures in interior spaces,
drafts, relative humidity or water accumulation,
- 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
- where masonry is used in chimneys and fireplaces, the
leakage of combustion products.
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.