Looks like it. At least underneath the mark anyway. Can see a bit of plasterboard poking out the bottom and the original lime plaster is still on either side. Unsure if the plasterboard is up to the ceiling though. The wall is all over the place.
i would hazard a guess you'd needto seal the bricks somehow or tank it with a permeable membrane? someone might come along and say otherwise
@musa started
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Looks like it. At least underneath the mark anyway. Can see a bit of plasterboard poking out the bottom and the original lime plaster is still on either side. Unsure if the plasterboard is up to the ceiling though. The wall is all over the place.