We've just had french door fitted and there has been screed laid in the area where the old wall used to be which is lower than the walls damp proof membrane, i dont think there is any damp proof under the new section, i have laid some wooden floor tiles over this section and there is a small amount of damp starting to show, what should i do? can i just remove the floor tiles and put some liquid damp proof over the top of the screed or should i dig up the screed and put a damp proof below that, what do i do about the join between the old and the new damp course under the original floor? Cheers

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