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N O PQ R S T U V W XYZ
U
Undercoat
The foundation coats applied before the topcoat.
Underlay
A flat roof covered with roofing felt will normally have three layers of felt. The first two layers are called the underlay.
Underpinning
Strengthening existing building foundations, to remedy a problem with subsidence.
UPVC
UPVC (unplasticised polyvinyl chloride) is a rigid plastic material widely used in the construction industry in the form of pipes, guttering, window and doorframes, fascias and soffits.