Sentence 9.19.1.3.(2)

Intent 1:

To limit the probability of inadequate airflow through the vented space, which could lead to:

• condensation in the space, 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.

Intent 2:

To exempt junctions of sloped roofs and exterior walls where preformed baffles are installed from the minimum clear air space dimensions specified in Sentence 9.19.1.3.(1), based on the demonstrated effectiveness of a reduced unobstructed space provided by insulation baffles.