Undercoat
One or more layers of paint used to cover the colour of a primer or previous paint colour. This also provides a protective layer before painting topcoat.
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Underpinning
A new, stronger foundation is built beneath the original when it becomes weak, in order to strengthen it and offset the risks of unstable foundations.
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UPVC
A plastic material used to make windows, gutters and rainwater pipes, as well as tape for sealing threaded plumbing fittings.
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