Kitchen drain backup with dishwasher

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by egor, May 12, 2008.

  1. egor

    egor New Member

    Messages:
    2
    Kitchen sink backs up into other sink when dishwasher or disposer run and drains slowly. Trouble started when we added dishwasher and disposer. I have 10 inches of drop from sink to trap is this enought? Replace inline vent about drain trap, checked 1.5 inch line it,s clean and has 1/4 inch drop to 4 inch line. Have 20 feet of 1.5 inch line to 4 inch line. Is this line too long? Does 1.5 inch line have enough volume to handle dishwasher and disposer? Should I go to 2 inch line to handle the volume?

    Thanks
    egor
  2. krow

    krow Plumber

    Messages:
    906
    Location:
    Ontario, Canada
    My money is on your "inline vent". Technically they should not be used in most juresdictions. The vent should really connect to a natural vent that goes up to and through the roof. You can test that vent/drain by simply removing the avv and try using your dishwaser and or disposer. If it runs good, then that is the problem.
  3. egor

    egor New Member

    Messages:
    2
    Added hight to vent and check complete system. All system go!
    Thanks
    egor:
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