Intent 1:
To limit the probability of inadequate support for
ties, which could lead to the excessive flexing of ties under lateral
loads, which could lead to inadequate load distribution among the
wythes of multiple-wythe masonry walls, which could lead to an inability
to resist transverse or vertical loads, which could lead to cracking
or buckling.
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.