Intent 1:
To limit the probability of:
- insufficient length, which could lead to an insufficient
overlap of wood shakes at the maximum exposure permitted, which could
lead to an insufficient number of shake plies over the roof surface,
which could lead to coinciding defects,
- insufficient width or shrinkage and cracking of excessively
wide wood shakes, which could lead to an excessive number and proximity
of cracks or joints, which could lead to relatively short paths for
water penetration past shingles, or
- significant differences in the thickness of shakes,
which could lead to the ingress of wind-driven rain or snow through
gaps.
This is to limit the probability of
precipitation or meltwater ingress, which could lead to deterioration,
which could lead to the structural failure of roofs or assemblies
protected by roofs, which could lead to harm to persons.