Intent 1:
To limit the probability of excessive eccentricity
of loads, which could lead to masonry cracking or falling.
Where exterior masonry walls support an environmental separator
or act as one, this is to limit the probability of
- precipitation 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.
Intent 2:
To clarify the method for measuring the projection,
beyond its supporting base, of rough-stone veneer where the face is
not coplanar.