To limit the probability of:
- the veneer being unable to support its own weight or
- insufficient bonding area between ties and mortar in
loadbearing or non-loadbearing masonry cavity walls, which could lead
to an inability to resist lateral, tensile and compressive loads,
- insufficient bond strength between masonry veneer units
in loadbearing or non-loadbearing cavity walls, which could lead to
an inability to resist tensile stresses due to lateral loads.
This is to limit the probability of:
- structural failure of masonry veneer, or
- where masonry veneer is exposed to precipitation, the
cracking of masonry or mortar, which could lead to excessive water
ingress, which could lead to the deterioration of building elements,
which could lead to compromised structural integrity.
This is to limit the probability of harm to persons.
To exempt masonry veneer in which the units are
not designed to provide vertical support to each other from the minimum
thickness requirement of this Sentence.