Intent 1:
To limit the probability that the performance of
vents will fall significantly below expectations with respect to:
- material integrity and durability, including corrosion
resistance, which could lead to the premature failure of vents,
- flashing provided by flanges,
- wind and rain resistance,
- protection against the ingress of insects or vermin,
and
- net ventilating area.
This is to limit the probability of:
- precipitation ingress,
- an infestation of insects or vermin, and
- insufficient venting, which could lead to:
- condensation, or
- the formation of ice dams, which could lead to the ingress
of water.
This is to limit the probability of deterioration, which
could lead to compromised structural integrity of attic or roof assemblies
or of elements protected by attic or roof assemblies, which could
lead to harm to persons.