Black patch damp

Postby alison1971 » Sat Jul 11, 2009 10:23 pm

My house is under erm...medical attention at the moment, and amongst quite a few jobs is a damp patch under the stairs, it is on an internal wall, but is the otherside of an external wall, and has about a 15-20inch black patch - I know this to be damp - just havent a clue how to treat it or sort it, any tips etc would be great, thankyou in advance!
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Simply Build It

Postby stoneyboy » Mon Jul 13, 2009 10:12 pm

If your house has cavity walls then the chances are that something is bridging the cavity where the damp patch is.
If you have solid walls look for obvious sources of water on the outside.
If neither of these see if there is a water pipe buried in the wall.
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