Ground floor DPM nightmare... what to do?!

hi @dazlight where you say "use a good vapour underlay" do you mean just do this without digging up the floor and doing the 2x10kg again (they basically didn't put enough down)?
And do you mean MVS/fball F78 / F77 over what's there atm OR dig up and start again? (knowing we can't go much higher with what's there atm...
 

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