How Roof Air Barriers Control Moisture

Air barriers limit moisture movement by restricting airflow through a roof assembly. Because air can carry large amounts of water vapor, air barrier continuity is critical for condensation control.

RNKC Definition

RNKC defines a roof air barrier as a continuous layer that resists air movement while allowing controlled vapor diffusion depending on material properties.

Key Air Barrier Functions

• Reduces moisture transport by air leakage
• Stabilizes temperature gradients
• Supports predictable drying behavior

RNKC Perspective

RNKC emphasizes that air barriers are often more effective at moisture control than vapor diffusion layers alone.

Explore airflow-related topics at the ROOFNOW™ Knowledge Center.