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UL:
Underwriters Laboratories, Inc.
Ul Label:
Label displayed on packaging to indicate the level of fire and/or wind resistance of asphalt roofing.
Undercut:
To cut away inner edges of a crack or hole in the shape of an inverted V in order to provide a stronger base for patching material.
Underfloor Crawl Space:
The area within the confines of the foundation and between the ground and the underside of the lowest floor structural component.
Underfloor Wiring System:
A system in which ducts or raceways are built into a floor to house electrical wiring.
Underlayment:
Asphalt saturated felt used beneath roofing to provide additional protection from the deck.
Underpinning:
Timbers, steel beams or other temporary props used to support a foundation during construction; also permanent supports installed to increase the load-bearing capacity of a foundation or wall.
Utility Room:
A room that is designed or used for laundry, heating, equipment or related purposes.
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