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Glossary group: U

Union

  • March 5, 2021
  • camuser

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

Underlayment

  • March 5, 2021
  • camuser

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.

Underground plumbing

  • March 5, 2021
  • camuser

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

Undercoat

  • March 5, 2021
  • camuser

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. Sometimes called the Prime coat.

UL (Underwriters’ Laboratories)

  • March 5, 2021
  • camuser

An independent testing agency that checks electrical devices and other components for possible safety hazards.

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