Kitchen sink redesign

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Rick Harris, May 13, 2019.

  1. Rick Harris

    Rick Harris New Member

    Joined:
    May 13, 2019
    Location:
    Nashville, TN
    1950's house using septic tank. The sink drains into a vented vertical pipe outside the house with cleanout access. Appreciate ideas on how to improve draining. Opposite sink backs up when using disposal. Drain backs up regularly.
     

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  2. hj

    hj Moderator & Master Plumber Staff Member

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    1. the outlet at the wall is MUCH TOO high
    2. the disposer is always full of water which has to be "pumped out" before draining can begin.
    3. the "center outlet tee" probably does not have baffle, but it might be ineffective with this drain even if it were there.
    4. Drain installation is COMPLETELY unacceptable
     
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  4. WorthFlorida

    WorthFlorida Broad-Wing Hawk

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    If it worked OK for years all the plumbing is now full of sludge because it can never completely drain. A 1950 house had very shallow sink depths and no disposals. If you cannot fix the drain height in the wall your only solution toss the disposal and sinks and replace the sinks. The least depth sink that can be found may only be 7" deep. 6.5" were available a long time ago but may no longer be manufactured. The sink drains would also need to be changed that are short. What has to be accomplished is the horizontal drain pipe from the sink must be above the waste line as shown below.


    [​IMG] [​IMG]

    https://www.homedepot.com/p/Glacier...Double-Bowl-Kitchen-Sink-HDDB332274/206950727
    https://www.homedepot.com/p/Glacier...ainer-in-Stainless-Steel-7043-103SS/207144421
    https://www.homedepot.com/p/Everbilt-1-5-in-Plastic-Center-Outlet-Waste-C9123AB/205153786
     
  5. Rick Harris

    Rick Harris New Member

    Joined:
    May 13, 2019
    Location:
    Nashville, TN
    ks4.jpg
    Exterior vertical pipe looks like the attached pic. What's the best way to remove existing portions of the verticle drain pipe to accommodate a lower outlet?

    Thanks
     

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  6. Terry

    Terry Administrator Staff Member

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    Occupation:
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    You can drill out and pry out the lead that holds the pipe in the hub, and then use a rubber hub insert for 2" pipe.
    Don't forget to pull the oakum from the hub.

    Or you can cut the cast iron pipe and use a shielded coupling, EX heavy cast to plastic coupling.

    [​IMG]

    New plastic pipe into a cast hub fitting. Yours would be on the vertical.
     
  7. WorthFlorida

    WorthFlorida Broad-Wing Hawk

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    Is this by chance was a camp made into full time residents? There doesn’t seem to be a vent. Do you have a septic tank or city sewer?
     
  8. mliu

    mliu Member

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    Location:
    Colorado
    It looks like the "vent" may be that stub of cast iron pipe covered with black duct tape! :eek:
     
  9. Terry

    Terry Administrator Staff Member

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    Occupation:
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    Yes, not really a proper vent. Normally that daylights above the roof to disperse the vapors.
    I wonder if someone cut it off at some point.

    [​IMG]
     
  10. WorthFlorida

    WorthFlorida Broad-Wing Hawk

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    There is the kitchen sink window above it.
     
  11. Terry

    Terry Administrator Staff Member

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    Occupation:
    Plumber
    Location:
    Bothell, Washington
    And normally the vent goes to the side of the window. Around the window. Pretty funny situation there.

    [​IMG]
     
  12. mliu

    mliu Member

    Joined:
    Feb 7, 2007
    Location:
    Colorado
    Looking at the old paint on the wood framing below the window, it almost looks like there used to be a pipe routed to the left. I'm guessing the black tape was to try to stop the sewer gas odors from coming in the kitchen window!
     
  13. Rick Harris

    Rick Harris New Member

    Joined:
    May 13, 2019
    Location:
    Nashville, TN
    Yes, the pipe previously went around the window to roof level. I plan to replace that as well. Drill out the hub above the cleanout and replace with rubber hub insert for 2" pipe lowers the horizontal drain pipe below the cleanout going to the wall. That work?
     
  14. OLD TIMER

    OLD TIMER Member

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    Location:
    FLORIDA
    if your on a septic system your not supposed to have a garbage disposal, anaerobic bacteria wont eat some food, and it messes up your system. take it out.
     
    Last edited: May 21, 2019 at 2:13 PM
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