dark stain bedroom ceiling

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21 Jun 2014
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Location
Essex
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United Kingdom
sudden stain appear on bedroom ceiling approx 2' x 2" no sign of damp in loft. Have painted over 3 coats but has come through again......... any thoughts please.
 
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Tks JohnD have checked again in precise point where mark is, all bone dry and not area where water pipe is
 
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tks JohnD, not raining but will check next time it does. Am thinking of thinking of painting with white oil based primer then matt emulsion
 
Is there any staining on the plaster board in the loft above the bedroom stain ?

If not then the stain was caused by something in the bedroom, what colour is the stain, light, dark, greasy
 
tks Bosswhite.......... no sign any stain or marks on plasterboard in loft.
under roof also show no sign where rainwater could ingress.
have now painted with primer and when dry will emulsion and wait to see what happens.
The stain happens to be very close to where water tank sits but have checked this thoroughly and all very dry also no pipe in area of stain.
 
does someone burn a candle in there?

Or is it above a lightbulb or other heatsource in the room of a person who smokes?
 
put toilet roll out on the plasterboard in the loft and if any water comes into contact it will show permanently
 

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