Damp Bedroom Wall

Joined
27 Oct 2011
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Location
Cornwall
Country
United Kingdom
Hi,

I have an old (1860) cornish cottage. The walls seem to be built in a mixture of mud and stone and we have a damp patch near the ceiling in the bedroom. The wall is inside of the gable end.

I have considered the following:
- There was an old flat roof extension joining on to the pitched roof but this has now been replaced with fibreglass.
- There is a chimney directly above the damp. It has a good cowell on it, the render is all solid and I had the flashing replaced at the same time the flat roof was done.
- There were a few cracks in the exterior render, but these have all been chased out and filled by a builder.

The next thing I am going to consider is having the whole of the exterior wall re-rendered (or cement washed) as recommended by a friend.

Anybody have any suggestions?
 
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It's nearly always condensation from the chimney.
 
As Joe says, chimney masonry can throw all kinds of unusual damp scenarios at you without actually having any external (rain) water ingress.
 
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Thanks for the quick replies!

The chimney was lined about 2 years ago with a flexible metal liner. Any suggestions on how to stop the condensation coming through?
 

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