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Thread: Toilet & Lav Wet Venting

  1. #1

    Default Toilet & Lav Wet Venting

    I'm roughing in a new lav and toilet that are about 3' apart and I have a question about venting.

    The toilet is to be roughed in at 12" and is 15" from the side wall. I want to install a 3"x3"x2" wye directly under the closet flange so that the 2" arm extends back to the wall (through a 2"x12" floor joist) and ties into the 2" vent stack (using a 45 elbow) for the lav that is wet vented. The bottom 3" connector of the wye will connect to a closet bend and travel about 18" and connect to the main waste line with another clost bend. This would then be the drain for the toilet and the lav.

    I know the 45 elbow has to be above the center line of the 3" wye. Is this configuration OK or is there another fitting that I can use instead of the 3"x3"x2" wye? As I said, the entire connection is right up against the 2"x12" floor joist so things are a little tight. Thanks for the help.

  2. #2
    Plumber Plumber2000's Avatar
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    Default

    Why not use a Low-heal 90, then wet wet the lav to the 2" vent off the lo heal that will vent the toilet with a 2 x 1-1/2" santee.
    Last edited by Plumber2000; 02-17-2005 at 05:47 AM.
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  3. #3
    Moderator & Master Plumber hj's Avatar
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    Default bend

    One reason may be that a low heel 1/4 bend, used that way, would not pass inspection in many areas of the country. In that configuration it is no longer a closet bend but rather a sanitary tee, on its back, in a horizontal line. Not knowing the orientation of the fitting we cannot tell you if there is a better fitting, or arrangement, but from your description, if accurate, it appears that it is a proper installation. The confusing thing is that you say it will be directly below the flange, which implys a vertical orientation, but then you ask about the 45 being above the centerline which then implies a horizontal one. Which is it.

    Last edited by Terry; 12-26-2008 at 12:46 PM.

  4. #4
    Plumber Plumber2000's Avatar
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    Check your code , here UPC allows as I explain.
    See Below, no problem passing inspection here, but maybe different there, this is a legal wet vent.


    Other Legal ways to wet vent lav to toilet vent under UPC

    Last edited by Plumber2000; 02-17-2005 at 06:56 AM.
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  5. #5

    Default

    Thanks for all the feedback. After a little online research I have decided to modify my configuration. Rather than use a wet vent for the Lav, I will extend the 3" pipe to pickup the 2" Lav drain. Since everything is within 2 feet of each other I think it should be OK. It seems to simplify the configuration a little. Here is a sketch of the new layout. Comments? Thanks everyone for the great information.
    Attached Images Attached Images  

  6. #6
    Moderator & Master Plumber hj's Avatar
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    Default drain

    Unless you get a very lenient inspector he is not going to allow that 3" sanitary tee on its back for your toilet connection. And I am not sure what you are calling a closet bend where it turns down, but if it is anything other than a conventional elbow, and in that location it does not have to be a long radius one, it might also be the wrong fitting. As for the heel 1/4 bend it is okay vertical, but not as a closet bend under the toilet, on its back.

    Last edited by Terry; 12-26-2008 at 12:46 PM.

  7. #7

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    Using the diagram as a reference, what fitting(s) would be the correct ones?

  8. #8
    Forum Admin, Expert Plumber Terry's Avatar
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    The last drawing by LarryK57 is wrong.

    From what you are trying to do, I would suggest that you come up with two lines.
    One for the wc(toilet) with it's own vent, A lowheel 90 would work here with the vent coming out the top of the fitting.
    Second one for the lav, with it's own vent, which can then be revented over to the wc vent.

    Last edited by Terry; 12-26-2008 at 12:46 PM.

  9. #9
    Plumber Plumber2000's Avatar
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    Each fixture must connect to it's own vent prior any other drain being connected. In other words what I show here is the lav sink has to tie into the stack after the toilet connects to it's vent and only then can you tie it into it.

    As seen below, this is what we ask for here under UPC, there are other ways to accomplish this but this is only one example.



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  10. #10
    Forum Admin, Expert Plumber Terry's Avatar
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    Plumber2000's picture is what I was thinking.
    Good job!

  11. #11

    Default

    Thanks very much everyone. After reading Terry's notes I reworked my layout. Since great minds think alike, I did it exactly the way Pumber2000 drew in his diagram. The fit was a little tight, but I managed to get it all in. I really appreciate all the help.

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