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  1. #1
    Join Date
    May 2012
    Posts
    14

    Default kitchen sink, no trap no vent, HELP!

    We have an 1892 kind of renovated brick house. Our double kitchen sink stinks because it has no trap, and the waste drain is vertical beneath the sink drains. I don't know how to even put an s-trap (I know not to code) or p trap without the space, or try AAV or cut the wall and vent outside with some weird drain arrangement.

    There is a joist which prevents easily getting a pipe at the back where it is supposed to be. I don't want to just hash it again like the previous owners did, but I have no idea how to do it as "proper" as possible with the limitations in place.

    after 10 posts I can submit pictures which I am sure would be far more useful than my description

  2. #2
    Join Date
    Feb 2010
    Location
    South*East
    Posts
    1,208

    Default Re: kitchen sink, no trap no vent, HELP!

    The drain line can be at any location under the sink. To use a AAV Just install a sanitary tee on the vertical pipe, connect the trap to the branch of the tee so it ends under the sink drain opening and install the AAV as high as possible on the run of the tee. (top side of the tee)

    John

  3. #3
    Join Date
    May 2012
    Posts
    14

    Default Re: kitchen sink, no trap no vent, HELP!

    Thanks for the reply John. This is just to make sure I understand, so the end result would look something like my drawing here?

    A couple other pics are for seeing what is behind the wood front of the cabinet.




    Just another thought. I can get at the pipe really easily in the basement. Could I put the trap here where it elbows to the main drain with an AAV at the top (under the sink)? That way there would be just one trap for both of the fixtures, or would this not work correctly.


  4. #4
    Join Date
    May 2012
    Posts
    14

    Default Re: kitchen sink, no trap no vent, HELP!

    Hi John,

    Thanks for responding. I tried to add a pic to make sure I understood this, but it went into a moderating black hole and two weeks later still hasn't shown up.

    With this being a double sink, can I use the kind of tee with four connections? I have each sink drain running to the vertical drain, so a sanitary tee is being used now except it is in a literal T configuration. I would need an extra opening at the top to install the AAV. At this point I'm thinking I can add the p trap to each sink before it runs to this T, or could I do just one large trap where the drain pipe goes into the basement (meaning I would need only one and there is more space down there, this would be far below the two sinks though.

  5. #5
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,774

    Default Re: kitchen sink, no trap no vent, HELP!

    Craigmg, a simpler solution would be to install a trap at the elbow of the black plastic pipe below the floor, you could also install a vent or AAV at that point.

    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  6. #6
    Join Date
    May 2012
    Posts
    14

    Default Re: kitchen sink, no trap no vent, HELP!

    Hi Jack,

    I was hoping someone would say that would work. With a trap fitted there, where would I put the AAV? I was thinking it would have to be above the sink drain.

    Could I use a 45 degree wye pipe and then have a vertical with the AAV at the top? This would mean the AAV would be on its own vertical pipe behind the pipe coming down from the sink to the drain. Or do I need it to be further away from the drain pipe.

  7. #7
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,310

    Default Re: kitchen sink, no trap no vent, HELP!

    Your top picture with your green markings will work. There is a connector called "double sanitary Tee", it has an outlet on top, where you can attach your AAV. Use it in the intersection of the sink and the GD.

    The only possible problem that I can foresee, is whether or not AAV is allowed in your city. Check with your building department before you start.

  8. #8
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,310

    Default Re: kitchen sink, no trap no vent, HELP!

    craigmg,

    Here's another issue that is important to address:

    Plumb and level the various pipes. In other words, rebiuld your entire drain:

    -Start by disconnecting everything.
    -Plumb the 2" ABS, by cutting the horizontal portion (under the floor) and adding a short piece to make it plumb (you may need 2 couplings).
    -make the necessary adjustments to the sink drain (make it longer) and GD drain (make it shorter).
    -install a double sanitary tee and attach your AAV at the top of the tee.

    Advice: if you want to DIY, make sure you know how, or you will end up with a greater mess.

  9. #9
    Join Date
    Feb 2012
    Posts
    92

    Default Re: kitchen sink, no trap no vent, HELP!

    First I would straighten the pipe by either cutting bigger hole or cutting pipe below then installing it straight or whatever means necessary then install two San Tees and put them in at different Heights and put our auto/mechanical vent up as high as possible in case of backing up and make sure that all of this meets local code but looks pretty straight forward.

  10. #10
    Join Date
    Feb 2012
    Posts
    92

    Default Re: kitchen sink, no trap no vent, HELP!

    Forgot to mention it also looks like below the floor that the pipe is back grading and should be corrected but think its probably due to the pipe not being straight and pushed up thru the top.

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