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Glossary

Water Resistant Barrier

A sheet, spray- or trowel-applied membrane or material layer that prevents the passage of liquid water even after long or continuous exposure to moisture.

Variants: WRB, water resistive barrier

Related resources: CP-1011: Evaluation of Cladding and Water-Resistive Barrier Performance in Hot-Humid Climates Using a Real-Weather, Real-Time Test Facility; CP-1010: Innovative Passive Ventilation Water-Resistive Barriers—How Do They Work?; Info-301: Drainage Plane/Water Resistive Barrier