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.
Watt: Electrical unit of power. Joule/second.
Weatherproof: The ability of a membrane or roof covering to prevent the passage of water with a
limited amount of hydrostatic pressure.
Weep Holes: Small openings whose purpose is to permit drainage of water that accumulates inside a building component (e.g., a brick wall, skylight frame, etc.).
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.
Window: A semi-transparent material that separates conditioned and unconditioned atmospheres. Windows may also attenuate certain wavelengths of infrared radiation.
Wood Destroying Organism: An insect or fungus that damages structures by feeding on, or nesting in, construction materials made of wood.
