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A bit of speculation: is your damp patch close to the lowest point of the fan ducting?
A couple of winters ago I had a sudden brown water issue (doesn't sound right however I phrase it) staining the ceiling and dripping from the fan switch: water in the duct had pooled and then found a way out.
My best guess at the time was the cold duct wall (unheated roof space) was allowing moisture to condense before it reached the outside - a shorter duct and lagging (a roll of garden fleece) seems to have solved the problem so far...
MrE
@hugo7
This morning a patch of stains, and brown dripping water appeared in the corner celling of my bathroom.
My first thought was a leak in the roof. But I checked above and there didn’t seem to be any signs of water ingress.
Background:
· The ex-owners were heavy smokers.
· We repainted the bathroom celling (the rest is tiled)
· I am not sure what type of paint, but there seemed to be a bit of a reaction with how it adhered.
· I think there is a fan, which isn’t working at the moment.
· The stains / drips are in what is probably the coldest corner – x2 external walls, furthest away from the radiator.
Do we think that it is most probably condensation build up caused by the lack of proper ventilation over the winter?
Also any tips on how to fix / install a ceiling fan? Are they things that commonly break?
Cheers.
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