How to stop Damp on plasterBoard Wall's? Any Idea's

Jamiemann06 · 26 Jun 2008

Hi I've got a problem and hope some one can help I have plasterboard wall's it's a new property 3 year's old it has already had paint on before i moved in however the bedroom is quite hot and now i have damp patches over it i have kept a window open to let out the humidity i have tried sugar soap to take the damp patches away however it's come back any idea's how i can get rid of the damp patches and still be able to paint on my wall's with an emulsion any help will be gratefully recieved.

I forgot to add the damp patches are not on a outside watll's .

Robbie uk · 26 Jun 2008

Sugar soap is only for getting rid of grease and stains like nicotine, it will not get rid of damp patches. Try using a thinned down oil based undercoat on the damp patches then recoat with emulsion once dry. Check that there are no leaks within the walls first ie is the wall backing onto a bathroom.

joe-90 · 26 Jun 2008

There's now way you will get damp from condensation in a hot bedroom - look for another source of water.

Jamiemann06 · 26 Jun 2008

Thanks I'll Try an oil based undercoat first I can't think what else would cause it as the wall that it affects back's onto the inside stair well and the person above me has their bedroom above me their doesn't seem to be any water pipe's near the wall that is getting the damp patches and it's not on an external wall People have surggested pva over it or using a THompson's damp seal before i Paint over it i have also been surggested to use a bleach first then oil based paint then emulsion i've been told that bleach kill's the damp spores and the oil based paint stop's damp coming through does that sound right? thanks for your help.

joe-90 · 26 Jun 2008

No it sounds like a load of rubbish. You won't get damp in a hot bedroom. Try drying it with a hair drier - if it dries you've got a leak. If it doesn't then it's not damp.

Jamiemann06 · 26 Jun 2008

Well at first I thought a leak from a pipe had caused it but then i thought i would have noticed a loss in pressure from the tap's wouldn't i? I'm running out of idea's where it could be coming from the reason i surggested condensation was that The flat is like a furnace it read 23c around the house and we did get lots of water build up around the patio door frame and window sill's now alll i want to do is get rid of it and paint my house i've had poxy magnolia for 3 years and its the first time the wife has agreed a colour with me lol

Robbie uk · 27 Jun 2008

Are you on a ground floor ? The plasterboard walls, are they dot and dabbed onto brickwork, as sometimes if there is rising damp as in old properties the damp can penetrate the board by coming through the dabs of adhesive on the back of the board. Bleach will kill mould spores but if its just a damp patch then there wont be any. Dont use thompsons water seal as this is silicon and wont let paint adhere to it.

joe-90 · 27 Jun 2008

If I were you I'd get into your loft when it rains. You may well have a leaking roof.

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How to stop Damp on plasterBoard Wall's? Any Idea's

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