Waterproof additives, such as methyl metracrylate polymer acrylic, coated on Portland cement.
Waterproofing
The treatment of a surface or structure in order to prevent the passage of water under hydrostatic pressure.
Waterproofing membrane
A covering applied to a substrate before tiling to protect the substrate and framing from damage by water. May be applied below mortar beds or directly beneath this-set tiles.
Watershed
(1) Land area where water collects. (2) Dividing point that sends water runoff flowing into different drainage areas.
Waterstop
Construction joint, which is plugged with plastic, rubber, etc. to prevent water passing through.
Watertight
Constructed to prevent water from entering.
Waterway fitting
A channel through which water can flow; connects water heater to inlet and outlet lines.
Watt
The rate of energy transfer equivalent to one ampere under an electrical pressure of one volt. One watt equals 1/746 horsepower, or one joule per second. It is the product of Voltage and Current (amperage).
Watt density
Amount of watts concentrated per square inch of element blade surface area.
Watt-hour
A unit of electricity consumption of one Watt over the period of one hour.
