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    Glossary



    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.