Plastering Over Copper Pipes, How to do it Right
Before you plaster your copper pipes, you should wrap it in duct tape or electrical insulation tape. I generally recommend wrapping it with something.
Yeah! All copper pipes should be covered with something, especially if cement and sand is used. A bit of movement is better as you see. Some plaster doesn’t harm copper but you can use a plastic sheet cut into 2 or 3″ strips & wrapped tight like a bandage & taped would do. Wire mesh can be good if a wide area & helps avoid cracks, but not always
From experience, the simplest one is a plastic-coated soft copper. It doesn’t take a very long time to wrap the pipes or getting that nasty sticky grease off your fingers afterwards.
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Plastering over pipes – What’s allowed?
The easy way to do this is to put them in a plastic condult so they can expand and contract that prevents direct contact with the plaster.