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Discuss Plumbing an island sink in the Plumbing Forum area at UKPlumbersForums.co.uk.

  1. Dave O'Brien

    Dave O'Brien New Member

    Hi all, I am in the process of planning my single storey extensions plumbing and drainage.
    Our kitchen plan has an island with a sink in it and im trying to work out how to get waste in and hot cold supply.
    I am having a solid floor construction of 150mm gravel, sand, dpm, concrete. Then in prep for underfloor heating - celotex with a 70mm screed on top.
    My thoughts are waste pipe between celotex and concrete maybe a form adding to concrete and sculpted celotex. The same for hot and cold supply potentially ran in another length of pvc pipe to protect them? Waste would be plumbed into new 110mm external drainage. Any advice welcomed as I will be doing all plumbing inclusive of drainage to cut down on cost. Thanks
     
  2. sammathias

    sammathias Plumber GSR

    Sounds about right as long as it isn't over a massive distance. (Waste pipe). Could be wrong but 70mm sounds excessive.
     
  3. Dave O'Brien

    Dave O'Brien New Member

    Thanks for the reply, 70mm will be the screed over the wet underfloor heating, the waste pipe will be 40mm diameter
     
  4. king of pipes

    king of pipes Trusted Plumber GSR

    If it's more than a 3m run then you will need 50mm waste pipe , solvent weld fittings and pipe , hot and cold pipework I would use hep 2o pipe in pipe strapped to the concrete slab under the celotex. Cheers kop
     
    • Agree Agree x 2
  5. Dave O'Brien

    Dave O'Brien New Member

    Thanks Kop, how do you plumb the waste trap as a normal one is horizontal and this will be vertical?
     
    Last edited: Jul 15, 2018
  6. snowhead

    snowhead Well-Known Member

    Are you making allowances for getting power to the Island as well?
     
  7. Dave O'Brien

    Dave O'Brien New Member

    Hi Snowhead, yes I am there will only be a requirement for a pop up socket so will incorporate that as part of the ring main for the sockets, again I was thinking to run this thru plastic conduit again.
     
  8. king of pipes

    king of pipes Trusted Plumber GSR

    Yes conduit the power supply there's normally a servis void in the island units where you can bring the services and drainage up then pipe as a normal kitchen sink. Kop
     
    • Like Like x 2
  9. snowhead

    snowhead Well-Known Member

    Oversize the conduit and leave a draw string in it, for when you realise you wanted something else on the island.
     
    • Like Like x 1
    • Agree Agree x 1
    • Useful Useful x 1
  10. bogrodder

    bogrodder GSR

    Make sure all pipework to island has been thoroughly pressure tested too;)
     
    • Like Like x 1
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