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Flat roof in good condition but bedroom underneath damp?

Postby alison1971 » Sun Jan 04, 2009 11:30 am

My daughters bedroom has had and has a damp problem, her room is an extension, and has three outside walls, and a flat roof.
There has been a damp patch appearing down three corners of the room, literally like water has run down each corner. The roof is dry, and in good condition, I have had a roofer on there to see what the problem was, and he said that the cement inbetween the coping stones had worn down, so he he filled them and that was that.
But, no change, teh corners are still wet, condensation on windows, and mould forms on walls and cupboards, what do i do?
I have had two roofers take a peek and both said same thing, coping stones, but no change....
I am trying to sell my house at min and this problem needs to be sorted, and i just dont know what to do next.

Please help with any advice, I have tried to clean mould off, it goes, but is back within a week or so.

Alison :(
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Postby thedoctor » Sun Jan 04, 2009 3:47 pm

Sounds very much like condensation. Take a look at our DIY Projects section and llook under condensation to see how you can vent the room. If its in all 4 corners its too much of a coincidence that they are all leaking at once.
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Postby alison1971 » Mon Jan 05, 2009 9:13 pm

I have cleaned the mould off, scrubbed everything. Going to buy a de-humidifier. Pulled all furniture away from walls before it does anymore damage. Have borrowed two extra radiators to plug in and dry walls out bit.
Will it be ok to repaint walls, poss with oil based paint first once walls feel dry?

thanks for message

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Postby the specialist » Tue Jan 06, 2009 7:02 pm

Hi Alison,

Do not use oil based paints on the walls. Because your problem is condensation it is dampness trying to get out of the house and not trying to get in. Painting with oil based paints will be like sealing the room in a plastic bag and will make it sweat more. Walls need to breathe and therefore you would be better using matt emulsion for re-decorating.
The most important thing to remember about condensation control is to try and get the balance right between heating, ventilation and insulation.

Good luck.

the specialist
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