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Discuss washing machine waste pipe in the Plumbing Forum area at UKPlumbersForums.co.uk.

  1. CrazyFool

    CrazyFool New Member

    Hi guys.
    I'm going to put my washing machine adjacent to my bathroom.

    The path of least resistance to plumb the waste pipe would be under the bath tub.

    Is this allowed?
    If yes, would there be any issues with the bathtub draining slower or the washing machine waste coming up into the bath tub?

    Thanks in advance
     
  2. SimonG

    SimonG Trusted Plumber

    Where does the bath waste go to? Take your washing machine to there.
     
  3. johnduffell

    johnduffell Member

    There wouldn't be an issue if the existing wastes are installed correctly with falls and ventilation correct and not blocked and the combined pipe is increased to 50mm, but it may not be worth the hassle if there is another way round it.
    The only time it would come in the bath would be if the plughole is a path of less resistance than the actual drain.
     
    • Disagree Disagree x 1
  4. CrazyFool

    CrazyFool New Member

    Thanks for the replys fellas.

    My other option is to notch through 3 meters worth of joists and then to drill through a brick wall to connect to the sewage line.

    Alternatively I could notch through 1.5 meters worth of joists and connect it to the sink.

    Thanks again

    CF
     
  5. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Would avoid notching for waste pipe
     
    • Agree Agree x 2
  6. johnduffell

    johnduffell Member

    Even if you're in the right part of the span, there's no way to notch a 50mm waste into normal depth joists and meet building regs let alone get the right fall over 3m distance.
    Boxing in above or below or in our case i dropped it straight down to the ground floor and ran out under the suspended floor downstairs as a 110mm pipe
     
  7. CrazyFool

    CrazyFool New Member

    Thanks for the replys fellas.

    Do I need a slope in the pipe? I was under the impression that the water pressure as it comes from above drum height would be sufficient to force water out of the pipe, even on a flat run.

    Dropping the pipe to the floor below isn't an option because of kitchen units etc.

    Which leaves me with the option of connecting the waste pipe (via a standpipe) to the bath trap or connecting it with a y connector to the pipe that goes out of the bath trap.

    How would I go about installing this correctly?
     
    Last edited: Apr 18, 2019
  8. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Definitely require a slope
     
  9. CrazyFool

    CrazyFool New Member

    Thanks for clarifying that.

    Would this work?:
    washing machine plumbing.png

    What sort of slope do I need? I might have 1.5 to 2 meters worth of pipe~
    Does it matter that the waste pipe goes up after the slope or does the vertical upstand mitigate any benefit of the slope?

    Cheers
     
  10. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    It’s simple science mate water does not run uphill if you are talking about joining onto the underside of the bath pipework you will have all sorts of trouble on your hands
     
  11. CrazyFool

    CrazyFool New Member

    I thought as much
    Thanks mate

    How steep does this slope need to be?


    How thin can these waste pipes go?
    I've got some noggins underneath the joists to suspend the ceiling downstairs, I might be able to squeeze the pipe in the space between the noggin and the joist with minimal notching.
    Not sure how much slope I'd be able to get with this sort of a system although it would be completely below washing machine level if this is any consolation.

    Cheers again
     
  12. SimonG

    SimonG Trusted Plumber

    Might be worth getting somebody in to sort it for you. Fresh pair of eyes and actual on site analysis and all.
    Could save a lot of grief in long run.
     
    • Agree Agree x 3
  13. johnduffell

    johnduffell Member

    Slope isminimum 18mm per metre. Only guttering can be laid level but it does affect the capacity.

    Falls Must be carried through any junctions or branches.
    Minimum pipe size would be 50mm but you might get away with 40 if you include an aav, and all other aspects of the system have good falls. However i can't be sure as i don't have that level of experience
     
    Last edited: Apr 18, 2019
  14. TMHM

    TMHM Member

  15. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    To achieve what mate water still won’t run uphill
     
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