We have something very similar in an upstairs bedroom which remains year-round. Party wall, no pipes in loft, no visible roof leaks, chimney stack in loft is bone dry. I've got no clue
We had something similar in the loft, pointing on chimney was shot. Flauching was full of holes and had a plant growing out if it.
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Oh yeah, chimney has been removed and neighbor has had a new roof. The wet patch was present before these works and hasn't changed 🤔
@atk started
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We have something very similar in an upstairs bedroom which remains year-round. Party wall, no pipes in loft, no visible roof leaks, chimney stack in loft is bone dry. I've got no clue