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leave DPM in or use waterproofer in mix?

Discussion in 'Building' started by mattu27, 20 Sep 2020.

  1. mattu27

    mattu27

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    Have install a new water mains that comes up through the garage floor in ducting.

    I had to remove a section of the floor .5m2 which was laid on DPM, have tried not to rip this but it's got a few holes in it.

    I've backfilled the duct with concrete to the DPM level but do I reuse the section of DPM that's a bit ragged or cut it away.

    The concrete round the duct is fresh so will stick pretty well to the next layer, I'm planning on putting waterproofer in anyway but wanted some advice.

    Shall I lay the new concrete on the old DPM or remove and go straight to the layer below?

    Thanks
     
  2. oldbutnotdead

    oldbutnotdead

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    Bit pointless ducting it then filling the ducting with concrete...
    As for the rest, either reuse the raggy bit or drop a new bit in neatly formed round the duct. Long as you're doing 100mm thickness it'll be fine.
     
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  4. mattu27

    mattu27

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    Haha, I've just re read what I typed. Does seem a little daft

    It's a good 8" slab I'll be putting back in. Do you think a splash of waterproofer will make much difference?
     
  5. ^woody^

    ^woody^

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    Drop some new polythene in and lap and tape it to the existing as best you can.
     
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  7. oldbutnotdead

    oldbutnotdead

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    Not much but chuck some in if it'll help you sleep at night :)
     
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