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Construction Terms and Slang

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U-Value
A measure of air-to-heat transmission (loss or gain) due to the thermal conductance and the difference in indoor and outdoor temperatures. As the U-value decreases, so does the amount of heat that is transferred through the glazing material. The lower the U-value, the more restrictive the fenestration product is to heat transfer. Reciprocal of R-value.

Ultraviolet
The invisible rays of the spectrum of light which are at its violet end. Sometimes abbreviated U.V.

Undercoat
A coating applied prior to the finishing or top coats of a paint job. It may be the first of two or the second of three coats. In some usage of the word it may, become synonymous with priming coat.

Underlayment
A material placed under finish coverings, such as flooring, or shingles, to provide a smooth, even surface for applying the finish.

Unobtanium
(slang) Coveted, unobtainably expensive gear. See also: Obtanium

Uprights
Vertical members supporting the sides of a trench.

User Problem
(slang) A technical malfunction that turns out to have been caused by the user's incompetence.