Obvious questions but what's on the other side of the wall?
It was a downstairs loo, now storage. Pipework capped etc and fittings removed. The skirting/wall on that side is dry, though I'm lifting the tile floor tomorrow, just to see if there's anything obvious.
Is the joist resting on anything or is there mud piled against it?
@allsop started
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Obvious questions but what's on the other side of the wall?