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Thread: kitchen sink vent issue

  1. #1

    Default kitchen sink vent issue

    i have a new kitchen in a single-wall house (no cavity like in 2x4 construction) in hawaii. the kitchen is located at the front of the house. i need a solution on how to vent my sink. if i run a conventional vent pipe, it will protrude through my single wall and have to be exposed along and up the front of the house...not all too attractive.
    in hawaii, aav are not code approved, although they are sold, and an easy solution.
    the house sits 24 inches above dirt on posts. the drain pipe that i will tie into is a 2" iron pipe that protrudes vertically out of the ground (i assume it then ties into the main sewer pipe underground) and is offset from the kitchen sink drain pipe about 14 inches. so there is no horizontal branch of the drain that could be used in a chicago-loop.
    can I use a 45/90/45 loop like in a chicago loop, and simply run the vent side down through the floor into the open air in stead of tying into the drain?
    or is there another solution?
    cheers.

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Default vent

    What is a "single wall house"? Is it just some kind of framework with paneling on the outside? The "yoke island vent", not a "Chicago style vent" can be installed inside a sink cabinet, but it still needs a vertical vent inside a wall somewhere.

  3. #3

    Default

    Quote Originally Posted by hj View Post
    What is a "single wall house"? Is it just some kind of framework with paneling on the outside? The "yoke island vent", not a "Chicago style vent" can be installed inside a sink cabinet, but it still needs a vertical vent inside a wall somewhere.
    single wall is extremely simple. it is tongue and groove 3/4" redwood. that's it! there is no cavity. once you drill from the inside, through the 3/4" redwood, you see daylight. electrical outlets are surface mounted in boxes, and wiring is run through surface-mounted channel. there is no insulation, as it is not needed in hawaii. it is very frustrating to work with, as everything runs along the surface, either on the inside, or outside.

  4. #4
    In the Trades Gary Swart's Avatar
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    Default

    How about this. Go through the wall to the outside and run the vent up. Build a box (aka "chase") around the pipe using the same material as the wall. When you can hide something, make it appear intentional.

  5. #5
    Forum Admin, Expert Plumber Terry's Avatar
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    Default

    The purpose of bringing the vent through the roof, is to disperse into the wind the sewer smells.

    Plumbing Code doesn't allow vent terminations within 12 feet of a window, unless it's above, like on the roof.

    I am guessing that you have rain gutters and downspouts?
    What is one more pipe?

  6. #6

    Default

    although i could box in the pipe on the outside front facing wall, it would be that much better, if i can route the vent under the house and off to the side.

    so, i could run a vent under the house, to the other side of the garage, so long as i maintain the 12 feet from any window?

    this would actually work very well for me. the house is situated such that having venting the sewer smell to the side would not be noticeable from any area of my property or my neighbors. i assume that all i would need to insure is that i have a loop under the cabinet similar to a chicago loop style?

  7. #7
    Moderator & Master Plumber hj's Avatar
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    Default house

    Unless this house is a one room cabin, you must have an internal wall where the yoke's vent could be installed.

    Last edited by Terry; 04-04-2009 at 03:34 PM.

  8. #8

    Default

    Quote Originally Posted by hj View Post
    Unless this house is a one room cabin, you must have an internal wall where the yoke's vent could be installed.

    you could think of this house like a cabin, since there aren't any "internal" walls.
    also, the diagram you presented won't entirely work for my application, since the pipe which exits the outflow side of the p-trap continues vertically down as it does in your diagram, through the floor and continues vertically into the ground. there isn't a horizontal section of drain under the floor into which i could tie the vent with the second wye as in your picture.

  9. #9

    Default

    [/QUOTE]

    could i possibly install a loop inside the cabinet, as in the diagram, run the vent through the cabinet floor under the house, horizontally across to the side wall, then up the side and through the roof overhang?

    is there any need to tie the vent into the drainpipe beneath the house, as in this picture?

  10. #10
    Plunger/TurdPuncher kingsotall's Avatar
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    To prevent siphoning the loop vent must connect as shown to the drain as well.

  11. #11
    Moderator & Master Plumber hj's Avatar
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    Default yoke

    Just run both pipes down and connect them together UNDER the tee for the lateral vent. Or you could use the way that US Steel did in the premanufactured houses they made in the 60's. Run the pipe up next to the sink and place a "U" shaped box over it.

  12. #12

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    Based on the help I have received so far, this is what I am thinking.
    How does it look?
    Attached Images Attached Images  

  13. #13
    Forum Admin, Expert Plumber Terry's Avatar
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    That looks pretty good.
    You may want to add a cleanout outside the home on the vent, and below the tee for the sink.

    The fittings you chose look good.

  14. #14
    Illinois Licensed Plumber SewerRatz's Avatar
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    Default

    Ditto on what Terry said add a C.O. on the outside vent line and one for the sink drain. That will work a whole lot better than no vent at all.

  15. #15
    Plunger/TurdPuncher kingsotall's Avatar
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    Are these pipes going to be bambooż



    sorry couldn't resist...

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