Damp patch on bedroom wall

Posted by Margaret Greenwood, on Mon 11 Nov 2013 07:45pm

I have had the roof re-tiled and chimney removed and still getting damp patch on bedroom wall, what could be the cause ?

Louis De Courcey

Tue 12 Nov 2013 06:07pm

As long as the roof and chimney removal has been done correctly , then there is probably a breakdown in the exterior brickwork and mortar allowing water to penetrate through the exterior wall.

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Chris Plastow

Mon 11 Nov 2013 09:36pm

This condition is called ammonium sulphate contamination . It has nothing to do with rain or roofing . It is hygroscopic salts in the wall where the chimney was . It is very easy to fix but messy ! The damp area or the whole area where the chimney was should be stripped back to the brickwork + 500mm to each side . The stripped wall area is to be waterproof rendered with Sika-1 and Leighton buzzard sand (Travis Perkins) . This will cure the problem , it's common as is the lack of knowlageble about this condition .

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jason reagan

Mon 11 Nov 2013 08:52pm

If its the outside wall it could be coming through the brickwork . What condition are the mortar joints in ?

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Andrew John Wheaton

Thu 14 Nov 2013 04:11pm

Check your loft insulation. Make sure it's over the problem area.

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Chris Ocego

Tue 12 Nov 2013 04:35pm

Hi If you have had your roof replaced with new they have done something wrong so if possible get them back as a new roof should not leak and should be fully guaranteed. Chris

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Sergejs Leonovs

Tue 12 Nov 2013 04:14pm

Hi Margaret If you have to repair the roof was a wet section of the wall (not the side wall of the house , if I understand correctly ), then it will be renovated for a while - a few months now because the wet season. You have repaired the roof, stop flow of water flows , as previously water from your roof throughout the inner portion of your wall , and took a sponge soaked your entire wall with moisture. So on top of moisture is not, on the part of your bedroom redecorating done , everything is beautiful, and the moisture inside the walls remained , and the new spot of dampness may appear in any other place. You can do minor repairs but it will not solve the problem, I think a waste of your money for repairs. Of course , there are some solutions to this problem , but the process is time-consuming and expensive. All can be repaired , ready to pay for it ... Respect Sergejs

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