Intent 1:
To limit the probability of:
- splitting or cupping of shingles or shakes that are
too wide, or
- exposed joints or defects in underlying courses at joints
between excessively narrow shingles or shakes.
This is to limit the probability of
the displacement of shingles or shakes, trim and flashing, opening
of joints or failure of caulking, which could lead to:
- 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
- falling cladding components.
This is to limit the probability of harm to persons.