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Thread: Upward drain

  1. #1

    Default Diagonal upward drain

    Kitchen drain pipes run horizontal to the main drain. Will there be a problem with drainainge if there is a diagonal upward slope (3"-4" slope) to main drain? thanks in advance
    Last edited by p1lumb3r; 05-06-2005 at 05:49 PM. Reason: revision1a

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Yes...it will create problems. My unprofessional opinion. How far does it go horizontal prior to hitting the vertical?
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Plumber RioHyde's Avatar
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    Absolutely. Water has this thing against running uphill unless pumped.

  4. #4

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    Yes...it will create problems. My unprofessional opinion. How far does it go horizontal prior to hitting the vertical?

    jadnashu..
    thanks for the reply...from the p-trap, horizontal pipe is about 3-4 ft. before the pipe goes diagonally up (not vertical) maybe about 3-4 inches to connect to the main drain pipe...thanks..

  5. #5
    In the Trades Gary Swart's Avatar
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    Water will not run up hill. A drain must slope downward at the rate of at least 1/4" per foot or 1" per 4 feet. No way around it.

  6. #6
    Moderator & Master Plumber hj's Avatar
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    If you can convince water tp flow uphill, your next project should be to design a perpetual motion machine, because it is supposed to be impossible also. To quote someone, "Don't lower the drain, raise the sink", or vice versa.

  7. #7
    Plumber jimbo's Avatar
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    That 4 feet of pipe would always be full of water. The sink would drain very slowly.

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