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.
This is to limit the probability of precipitation or meltwater
ingress, which could lead to deterioration due to freeze-thaw stresses.
Where masonry construction is required to provide fire resistance,
this is to limit the probability of compromised fire resistance of
the assembly, which could lead to harm to persons.