patching 100mm hole on bathroom ceiling

11 Jul 2007
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United Kingdom
I'm replacing a bathroom fan with an in-line fan in the loft, therefore I'm changing the position of the fan on the ceiling. What's the best way to cover the hole left after I remove the old fan (about 100 mm diam)?
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Assuming that it's a plasterboard ceiling, I would cut a piece of plasterboard to match (usually 12.5mm) and screw to a backing of wood such as a piece of floorboard. You'd probably find it easier to make the hole rectangular to start with, and scrape about an inch of plaster off around the repair so that you can use scrim tape and joint filler.

Then you need to skim to match the rest of the ceiling. If you are anything like me at plastering, you'll need to make good afterwards with polyskim or similar which sands easily, but I'd use some plaster skim first because it sets quicker and is much cheaper.

It would be probably be more satisfactory to have it skimmed professionally after you have patched it, but with a bit of time and effort, you should be able to get it looking pretty good yourself

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