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@apc
Have a patch of wall that’s getting a bit of mold and damp looking so took off the paint and some of the plaster to investigate.
It’s on an external wall but nothing on the exterior would suggest a reason for the damp. Gutters are fine etc.
Does this look like gypsum skim coat over lime plaster? Could the moisture just be trapped behind and coming through at this point? (notice there is a crack in the plaster here too where it could slowly come through)
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