What Is Relative Humidity in Attics?

Relative humidity describes the amount of moisture in the air compared to the maximum amount the air can hold at a given temperature. In attic spaces, relative humidity directly influences condensation and moisture accumulation.

RNKC Definition

RNKC defines attic relative humidity as a dynamic condition affected by interior moisture sources, ventilation rates, and exterior climate conditions.

Why Attic Humidity Matters

• High humidity increases condensation risk
• Cold surfaces lower moisture-holding capacity
• Poor ventilation limits drying potential

RNKC Perspective

RNKC emphasizes that attic humidity must be evaluated as part of a whole-roof system rather than as an isolated ventilation issue.

Learn more at the ROOFNOW™ Knowledge Center.