UL
Underwriters Laboratories, Inc.- UL is the trusted resource across the globe for product safety certification and compliance solutions. 

Unencumbered
The state of having no mortgages, liens, or other claims against a property. A property that is unencumbered is said to be ‘free and clear’.

Unfaced Insulation
Insulation with no attached vapor barrier. 

Ultraviolet Light
Ultraviolet (UV) light is part of the light spectrum. UV light wavelengths cannot be seen by the human eye.

Underlayment
Layer of material usually installed on or over a subfloor that provides a surface suitable to receive a new floor covering.

Unglazed Tile
Ceramic tile (quarry tile, porcelain or terra cotta) with no surface glaze.

Urethane
A urethane surface that keeps its like new look far longer than vinyl no-wax surfaces, without waxing, buffing, or polishing. Resists household stains like mustard, shoe polish and lipstick. Resists foot traffic stains like tracked in asphalt driveway sealer.

Utility Knife
Tool containing a blade and used to cut vinyl sheet and vinyl tile during installation.