Intent 1:
To limit the probability of:
- excessively thick mortar joints in relation to the surface
area of the masonry, which could lead to water leakage through shrinkage
cracks and water absorption through mortar joints, or
- excessively thin mortar joints, which could lead to
inadequate support of masonry or inadequate masonry-to-mortar bond
strength, which could lead to cracking.
Where masonry units support or are
part of an environmental separator, this is to limit the probability
of:
- excessive moisture transfer through masonry units, or
- deformation or cracking, which could lead to the displacement
or failure of required environmental separation elements.
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, or
- deterioration, which could lead to further compromised
integrity of environmental separators.
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.