Residential New Home Construction Glossary


House Building Glossary - U

UL (Underwriters'Laboratories) - An independent testing agency that checks electrical devices and other components for possible safety hazards.

Ultraviolet Degradation - A reduction in certain performance limits caused by exposure to ultraviolet light.

Undercoat - A coating applied prior to the finishing or top coats of a paint job; may be the first of two or the second of three coats; a.k.a. prime coat.

Underground Plumbing - The plumbing drain and waste lines that are installed beneath a basement floor.

Underlayment - A " material placed over the subfloor plywood sheeting and under finish coverings, such as vinyl flooring, to provide a smooth, even surface; also, a secondary roofing layer that is waterproof or water-resistant, installed on the roof deck and beneath shingles or other roof-finishing layer.

Union - A plumbing fitting that joins pipes end-to-end so they can be dismantled.

Utility Easement - The area of the earth that has electric, gas, or telephone lines; may be owned by the homeowner, but the utility company has the legal right to enter the area as necessary to repair or service the lines .

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