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is there a downpipe on the other/outside of this wall?
if there is, worth having a look at what it’s doing when it rains next - could be a simple as the downpipe coming loose from the gutter at the connection splashing water on the wall.dehumidifier on the inside possibly worthwhile in the meantime if you can.
hvsds
I removed some old wall paper only to discover this. Behind this sit the kitchen and drain pipes from toilet upstairs. Do I need a specialist to come and evaluate the damage or is there anything I can do myself, hoping to get this room plaster.