How to make a formwork to hide pipes at the top of the walls?
Several solutions are possible. The most classic is to achieve a formwork with strips of panels (particle, plywood, medium, etc.) attached to the walls and between them by cleats. You can also do it with gypsum board strips fixed by metal structures. Simpler solution (depending on the size of your pipes), use a large plastic chute such as the one used in industrial electricity (you can then paint it, finally, you can also ask a hollow cornice made of polystyrene. Get inspired by the DIY tip sheet titled Creating Cornice Lighting.
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