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vapor

Vapor Retarders & Air Barriers

A diagram showing three diagonal lines, three water droplets, and a wind symbol on the left—illustrating air barriers and vapor retarders—with a cross-section of layered materials and two dashed lines on the right.

Water exists as solid, liquid, and gas, with vapor being a significant concern for buildings. Humidity affects comfort and moisture levels can lead to issues like mold. Proper placement of vapor retarders and air barriers is crucial to manage water vapor and prevent condensation and related problems within building cavities.