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  • That moisture is just coming from groundwater I think, forced up through the only porous bit of the floorplan left.

    I had our water feed in replaced to decommission the leaking pipe. All heating pipes come down the walls, that's the only thing I can think that's left unless our soil pipe is cracked under there.

    Actually I should probably get that checked by one of those remote camera guys.

    Knocking down the wall and replacing with steel & stud wall would probably be less destructive than ripping out the concrete floor.

  • You can potentially test the soil pipe yourself for £10 worth of drain bung. Google drainage water drop test.

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