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U

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.
Uprights – Vertical members supporting the sides of a trench.
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.