damp patches

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ruddez

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skimmed a house out over old stone mortar walls but after a couple of days where the chimney breasts are in one bedrooms and one room down stairs there are damp patches that wont dry out and tends to go a little worse when its raining the chimneys have been taken down and the roof seems to be well sealed,could it be that the old mortar where the damp patches are should be hacked off and rerendered,perhaps put vents in where the fireplaces were, i have been up the loft and it is bone dry on the gables and also the outside has been rendered and no cracks, the lady in the house is prepared if it cant be solved to put a 2x2 timber frame and board/skim where the damp walls are,any thoughts anybody
 
You possibly stopped it breathing, so moisture built up, there mustbe penetration if it gets wetter when it rains, remember that the chimney will have a salt build up anyway, a vent is a good idea and furthe investigation
 
You possibly stopped it breathing, so moisture built up, there must be penetration if it gets wetter when it rains, remember that the chimney will have a salt build up anyway, a vent is a good idea and further investigation
 
Artisan998 said:
You possibly stopped it breathing, so moisture built up, there must be penetration if it gets wetter when it rains, remember that the chimney will have a salt build up anyway, a vent is a good idea and further investigation
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Uncanny, you're a genius
 
You say the chimneys have been removed but is the house attached to another house who's chimneys haven't been removed that could be your problem ,if its a detached house then as above
 
You have a void where the chimneys are, it will have warm and cold air which will create condensation and this needs to go somewhere.
 
So basically it is an extinct flue cos it stopped smoking a long time ago ? erm i'll just get me coat :RpS_unsure:
 
superspread said:
It might do in your world ,still a flue,so you don't call the space between two skins of brickwork a cavity you call it a void :RpS_laugh:
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No mate stop trying to wriggle its not just my world its everyone elses appart from yours :) a flue is a vent once one ends blocked it stops becoming a vent or a flue. A void is something that is empty like an old flue that is blocked up making it a void. A space between two brickworks is a cavity you called it a void :)
 
ruddez said:
skimmed a house out over old stone mortar walls but after a couple of days where the chimney breasts are in one bedrooms and one room down stairs there are damp patches that wont dry out and tends to go a little worse when its raining the chimneys have been taken down and the roof seems to be well sealed,could it be that the old mortar where the damp patches are should be hacked off and rerendered,perhaps put vents in where the fireplaces were, i have been up the loft and it is bone dry on the gables and also the outside has been rendered and no cracks, the lady in the house is prepared if it cant be solved to put a 2x2 timber frame and board/skim where the damp walls are,any thoughts anybody
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Experienced this before, it looked like damp patches on a chimney breast, down the side of a fire place opening.it was to do with the soot Think it can cause salts in the brickwork, pass thru to the surface an attracts moisture? Looki like a damp patch?? This may be your problem
 
Fatarm said:
Experienced this before, it looked like damp patches on a chimney breast, down the side of a fire place opening.it was to do with the soot Think it can cause salts in the brickwork, pass thru to the surface an attracts moisture? Looki like a damp patch?? This may be your problem
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spot on mate.

Its worse when it rains because there is more moisture in the air.

Try applying a salt neutraliser and sealing it with a oil based primer in the first instance. If that does not work hack off and render with a salt inhibitor additive in the mix.
 
I've experienced this b4 as well ,job im on has got brand new roof ,new flashings everything ,bone dry party wall in the loft,but it didn't show on the breast it showed on the two alcoves either side , the only way in was from the neighbours side hence my first post
 
Could still be a salt problem. Try my method as above mate. It's the cheapest and best place to start.
 
Used to get damp patches in funny places round the house when I was younger, always on Saturday and Sunday mornings which was strange. Now I don't go out as much the damp patches seem to have dried up. Any ideas on this boys?
 
Try venting the top of the chimney - either an airbrick if it's on a gable-end or a ridge or tile vent if it's in the middle of the roof. :RpS_thumbup:
 
The chimney feathers..............now what you do to tickle your flue is your business - and far too much information before the watershed :-0
 
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