Kitchen Island Waste

Discussion in 'Plumbing and Central Heating' started by bmb4cjt, 28 Oct 2021.

  1. bmb4cjt

    bmb4cjt

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    Just about hardcore/concrete etc new kitchen floor.

    I've got the 110mm waste pipe in place for the kitchen island, do I need anything other than a 90 rest bend and 110m pipe coming up out the floor for the above ground plumbing/traps etc?
     

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  3. just pumps

    just pumps

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    110mm? Are you fitiing a toilet in the kitchen?
     
    Last edited: 28 Oct 2021
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  4. cross thread

    cross thread

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    Oversized pipe ,but yes 90 deg bend and a piece of pipe will do
     
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  5. bmb4cjt

    bmb4cjt

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    Thanks, well that's nice and easy.

    Gonna use a reducer as it comes out the floor but it's what the groundsworkers left me with (have had to take up the oversite they placed as too thin) when they did the extension drains. At least we shouldn't get any blockages
     
  6. johnny2007

    johnny2007

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    A toilet fitted in the middle of the kitchen, integrated with the island.
    Genius!
     
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  7. JimCrow

    JimCrow

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    Your 110mm pipe is fine, the minimum size for an underground drain in your situation is 3" (82mm), as 82mm underground pipe and fittings are harder to get and usually more expensive 110mm is used.
    Only a cowboy would bury 1½" or 2" pvc waste pipe under a concrete floor.
     
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  9. Hugh Jaleak

    Hugh Jaleak

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    As an aside, you wont need a Rest Bend, they're only required at the base of a stack, a standard 90 will suffice. I would suggest you use a rigid adapter to get from 110 to 40mm, not a fan of the floppy rubber types used internally. Always the risk if the drain blocks they can dislodge, allowing waste to escape into the building.
     
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  10. just pumps

    just pumps

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    Would you still say this if it was only for the kitchen sink?
     
  11. Hugh Jaleak

    Hugh Jaleak

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    I would. All underground should be 110mm, only reducing at Floor level, even for a Cloakroom Basin. Kitchen sinks can be the worst, I'd rather be getting a fat blockage out a 110mm pipe than a 40mm.
     
  12. JimCrow

    JimCrow

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  13. jj4091

    jj4091

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    That is good to know but it does not say from where to where, & presumably only if it is buried at a certain depth as internal & external waste pipes often seem to have long smaller size runs.If a 40 mm pipe was in a channel in the floor then tiled over would this advice still be applicable?
     
  14. Hugh Jaleak

    Hugh Jaleak

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    Elsewhere in the Part H Document Jim has referred to above it gives the maximum length for Waste Pipes, which for 40mm is 3 metres. If the proposed run can be kept under that distance from the appliance to the points where the pipe discharges, then should be ok, but then you have the issue of getting the correct fall.
     
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