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Have you access to the floor above it? if you do, try to life some floorboards and see what you can find.

If the ceiling is the bottom of the attic, find a way in and check out the pipes.

If you can't access floor above, ask whoever lives there to have a look for you.

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Q: How do I investigate a water stain on the ceiling?
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Why is there a shiny spot where i painted over a water stain on textured ceiling?

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If it's coming from the roof then the bathroom ceiling will have a water stain on it too. If you don't see this then it is coming from your bathroom.


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If the stain is dry and the ceiling, if papered, is still sound, then try using a "stain-blocker" paint. Most paint manufacturers produce such paints.* Do not use a water-based paint, such as emulsion or acrylic, because the stain, even though dry, will still bleed through.It is important to remember that two coats may be necessary: the first painted across the stain in one direction and, after that has dried, another coat painted at right angles across the first coat.Do not use any finishing coat until all traces of the stain have been "blotted out" by the stain-blocker. Allow to dry thoroughly and then finish off with one or two coats of ceiling paint i.e. emulsion or acrylic. * Dulux and International Paints(usual disclaimers apply!) are effective.


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