I bought a Victorian house recently and there was no damp in the house at the time. I then had building work done, building a one storey extension at the back next to the existing bathroom, and refurbished the existing bathroom including damp proofing the floor.
Now the work is done, damp patches have apeared at ground floor level, around all walls of the bedroom next to the damp proofed bathroom, even in the walls not next to the bathroom. Any ideas of possible causes?
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