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to a letter:
U
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.
U.L. (Underwriters
Laboratories): A private research firm located
in the United States that attempts to classify and determine
the safety of various materials and products.
Ultraviolet:
The invisible rays of the spectrum of light which
are at its violet end. Sometimes abbreviated U.V.
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. It may be the first of two of three
coats. In some
usage of the word
it may become synonymous with priming coat.
Undercounter:
A style of lavatory which is positioned under
the cutout of the countertop.
Underground
Plumbing: The plumbing drain and waste lines that
are installed beneath a basement floor.
Underlayment:
A material placed under finish coverings, such
as flooring, or shingles, to provide a smooth, even surface
for
applying the finish.
Union:
A plumbing fitting that joins pipes end-to-end
so they can be dismantled.
Union Nut:
A fitting that joins two sections of pipe.
Uprights:
Vertical members supporting the sides of a trench.
Utility
Easement: The area of the earth that has electric,
gas, or telephone lines. These areas 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.
UV Rays:
Ultraviolet rays from the sun.
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