Washing machine & dishwasher shared drain

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by velosnow, May 23, 2021.

  1. velosnow

    velosnow New Member

    Joined:
    Sep 26, 2019
    Location:
    Colorado
    My wife and I just made an offer on a vacation property and the current owner has removed the dishwasher and put a euro style washing machine in place instead, see listing pic below...

    [​IMG]

    If we purchase the place, we are going to replace the cabinets and are considering adding dishwasher back in the mix - probably an 18" one to save space.

    That said, could a dishwasher and this washing machine share a drain under the sink? It looks like they ran the washing machine drain line to the disposer as you would for the dishwasher. Is it easy as adding a tee of some sort or more complicated? Any code issues to be aware of? This is a 3rd floor unit so I want this done right, thought I'd start here to see if I can safely do this or if I need a plumber.

    Thanks!
     
    Last edited: May 23, 2021
  2. velosnow

    velosnow New Member

    Joined:
    Sep 26, 2019
    Location:
    Colorado
    Just updated the link that should work now.
     
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  4. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    I have never heard of a washer using the disposer for a drain. We plumb those to a 2" p-trap with standpipe. It's draining through a 3/4" port on the disposer?
    I suppose when the wall is opened up, you can add the 2" p-trap and standpipe for the washer and use the disposer for the dishwasher.
    The kitchen sink has 2" pipe run to the santee and uses a 1.5" p-trap for the sink. You could cut in below the santee for the sink and add the drain for the washer. Both traps need venting.
     
  5. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    CO uses IPC 2018.

    The IPC calls for 3 inch pipe to carry waste from a washing machine once combined with something else. If they made an exception, which they might, for a 2-inch pipe to carry a kitchen sink with disposal, laundry, and a dishwasher, I think the plumber would have to get into the wall, which may be fine. This will be a problem for a plumber I would think, but he may be aware of some local treatment that makes this OK.

    I am not a plumber.
     
  6. velosnow

    velosnow New Member

    Joined:
    Sep 26, 2019
    Location:
    Colorado
    Thanks Terry, I've seen these washing machine & dishwasher setups often in other countries and never took the time to see how they plumbed them. More of a curiosity at the moment to see what common solutions might be. Of course stumbled across this video on YT and no clue if it would be appropriate here but found the tee connection interesting especially since it wasn't working for him.



    I won't put too much effort into this quite yet as our offer deadline is still a few hours out still. The building does have laundry so we might just scrap this idea if we move forward anyway and go back to just a dishwasher. Just liked the idea of possible in unit laundry if it was handy and not too costly to get setup.

    Here is the lone pic I snapped of the sink, the washer drain definitely appears to be going into the disposer.

    [​IMG]
     
    Last edited by a moderator: May 23, 2021
  7. Jeff H Young

    Jeff H Young In the Trades

    Joined:
    Feb 27, 2020
    Location:
    92346
    a few plumbing changes needed , btw no airgap needed for the clothes washer I see one on sink top. likely a 3 inch line if clothes washer is staying
     
  8. WorthFlorida

    WorthFlorida The wife is still training me.

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    If the washing machine is connected to the air gap, I doubt it can handle the amount of water a washer can dump in a short time. It might overflow from the air gap into the sink. It might not be used. What is the pipe on the left that I marked.

    washer-dishwasher.jpg
     
  9. velosnow

    velosnow New Member

    Joined:
    Sep 26, 2019
    Location:
    Colorado
    LOL, dig the 'what is this' label because I have the same question. May or may not get answered, 3 hours to go until our offer deadline hits.
     
  10. WorthFlorida

    WorthFlorida The wife is still training me.

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    Nothing there that would deter to turn down the deal. It’s all fixable.
     
  11. velosnow

    velosnow New Member

    Joined:
    Sep 26, 2019
    Location:
    Colorado
    Welp, we're under contract so once we get a few other things sorted out I'll probably be back with a few more questions. Thanks guys!
     
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