I have a small area of live plaster which doesn't appear to have any cracks anywhere near it. I have scraped out the plaster and filled the hole with external polyfilla, as I thought this would be stronger than internal filler. The area is again live. Any ideas how I should proceed?
Is there a pipe buried in the wall or cable passing through the wall? you could remove the plaster layer and dig into the wall below in the area of the damp patch - this may establish the problem.
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If you have cavity walls then the most likely cause is mortar dropped on a wall tie which will create a bridge for damp.
If you have solid walls and they are rendered/painted look for hairline cracks in the surface.
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