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Damp Proof Membrane To prevent dampness getting through a ground bearing concrete floor should be protected by an impervious layer, usually a 1200 gauge (0.3mm) heavy duty polythene damp-proof membrane. The DPM can be positioned either on the sand blinding or on the concrete slab. Joints in a Polythene DPM should be welted or taped and should overlap by at ...

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