![]() Using the paper as a template, draw around a sheet of plasterboard.ĥ. Take down the paper and cut around the outline to get the exact size of the hole. Tape newspaper tightly over the hole and trace the edge of the plaster with a felt-tip pen.Ĥ. This will form a lip on the sound plaster. After you've bought your plasterboard, use a filling knife to undercut the sound plaster edges. Don't stop until you have removed all the unsound plaster.ģ. Do this before you buy the plasterboard patch, so you know how thick a piece to buy (ie, as close as possible to the thickness of the existing plaster). Open up the cracks with a filling knife, then gently pull away all of the old, cracked plaster back to the laths and ceiling joists. Before you do anything, take extreme care to cover everything with dust sheets, then put on a dust mask and goggles.Ģ. Loose, cracked or bulging plaster on a ceiling should be dealt with quickly - it's heavy and could cause injury if it falls on someone. Repair a lath-and-plaster ceiling without calling in an expert plastererġ. Your other option is to use a plasterboard patch to repair the hole. Unless it's a very small hole, we'd recommend you bring in a professional plasterer to achieve a smooth finish. If you have an area where the plaster has come away from the ceiling, you could effect a (very messy) plaster-repair job by carefully pulling away the damaged plaster (plaster is surprisingly heavy), then using two or more layers of undercoat plaster followed by a finishing (skim) layer. Lath-and-plaster ceilings often crack with age owing to their lack of flexibility. Lath-and-plaster: laths are thin strips of timber that are nailed to the joists to form a (gappy) board, on to which plaster is liberally applied. ![]()
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