damp proof membrane

paulpa · 18 Sep 2011

If i have laid a concrete floor base with 1200 gauge dpm under, do i still require another dpm sheet over the concrete before insulation and screed, or is the one already in place enough?

RedHerring2 · 18 Sep 2011

You need a polythene sheet over the insulation. it doesn't need to be a proper dpm. It's just to stop the screed losing too much moisture into/ between the insulation.

You could tape the joints, but a) some BCOs prefer polythene sheet, and b) polythene sheet is easier, quicker and more secure.

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damp proof membrane

paulpa

RedHerring2

DIYnot Local

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