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.