How Roof Ventilation Affects Moisture

Roof ventilation influences moisture levels by regulating air exchange and temperature within roof cavities. Ventilation can support drying but cannot compensate for uncontrolled air leakage or vapor drive.

RNKC Definition

RNKC defines roof ventilation as the intentional movement of air through roof spaces to moderate temperature and support moisture dissipation.

Limits of Ventilation

• Does not stop moisture entry
• Effectiveness varies by climate
• Requires coordination with air sealing

RNKC Perspective

RNKC emphasizes that ventilation is one component of moisture control and must be evaluated alongside insulation, air barriers, and vapor control strategies.

More system-level guidance is available at the ROOFNOW™ Knowledge Center.