Sentence 9.19.1.3.(3)

Intent 1:

To limit the probability of:

• restricted air flow through the vented space, or
• excessive air flow through the insulation, which could lead to reduced thermal resistance.

This is to limit the probability of:

• condensation,
• the accumulation of moisture, or
• the formation of ice dams on sloped roofs.

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.