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WSRCA: Western States Roofing Contractors Association.

Warranty: the written promise to the owner of roofing materials for material related problems.

Water absorption: the increase in weight of a test specimen expressed as a percentage of its dry weight after being immersed in water for specified time at a given temperature.

Waterproof: the quality of a membrane, membrane material, or other component to prevent water entry.

Waterproofing: treatment of a surface or structure to prevent the passage of water under hydrostatic pressure.

Weather: the undergo degradation in quality and appearance which is caused by exposure to the sun, wind, rain, etc.

Weatherproof: the ability of a membrane or roof covering to prevent the passage of water with a limited amount of hydrostatic pressure.

Wet: a condition where free water is present in a substance.

Wet film thickness: the thickness, expressed in mils, of a coating or mastic as applied but not cured. For comparison, see Dry film thickness.

Wind uplift: the force caused by the deflection of wind at roof edges, roof peaks or obstructions, causing a drop in air pressure immediately above the roof surface.