To limit the probability of inadequate strength
in the prevailing direction of shrinkage, which could lead to the
excessive cracking of stucco.
This is to limit
the probability of:
precipitation or meltwater ingress, which could lead
to deterioration, which could lead to the structural failure of exterior
walls or elements protected by exterior walls, or
stucco detaching and falling from the building.
This is to limit the probability of harm to persons.