The National Institute of Home Builders - Home Page
Glossary of Home Building Terms



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 ¼" 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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