Extension flooring query

Discussion in 'Builders' Talk' started by Joely90, Jul 1, 2018.

  1. Joely90

    Joely90 New Member

    Morning all.
    We currently planning to add a downstairs toilet to our old extention. There is an inspection chamber which we can feed our soil pipe to .

    The floor is concrete and there is what looks like a dpm at the edges of the slab. Our intention is to tile the space .

    The query I have is that if I dig the new soil pipe into the floor then I would damage the Dpm under the slab .
    Would the best way to remidy this be to patch the floor with the pipe installed and use a polyurethane, epoxy or bitumen dpm? Then use a levelling compound over the top and tile directly to that?

    What are your thoughts?


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