Intent 1:
To limit the probability of discontinuity in mortar
joints at either interior or exterior faces of hollow masonry units,
which could lead to inadequate tensile and compressive strength of
mortar joints.
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.