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Thanks Mr C; Yes, there are a few airbricks in the exterior wall, though no air will have got through to the rotten joists. I will excavate to 300mm. Do you think sleeper/dwarf walls are the right way to go? Would positioning new joists on single bricks also work? Willing to be shot down by...

Thanks Bonni. Is it worth digging out a cavity so there's room to put in dwarf walls and rest new joists on those? I'm thinking I should do this "properly" with dwarf walls, breathable membrane etc but that would require digging out a fair bit of earth which the joists are currently resting on.

Hi all. I've moved onto a Georgian house in serious need of renovation and care. The flooring in the main downstairs room is rotten in the corner so i'm pulling up the floor to see how far the problem extends. It looks like the joists are plonked straight onto the ground so not surprising the...