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Thread: Connect lav drain directly into toilet

  1. #1
    DIY Junior Member econjon's Avatar
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    Default Is it code to wet vent toilet with lav with san-T in closet stack

    A few years ago I added a second bath. I had read that it was ok to wet vent the toilet with the lav stack as long as the stack was 2" and not too far away. Problem is the city inspector wants to see the underground fittings. So I have just cut out the work, and I'm not sure it's up to code. Looks like I connected the lav drain directly into the toilet drain with a san t before the closet bend.

    EDIT: I found this (5t picture down in link) that says it should be ok. http://www.3dplumbing.net/ontplumbing/wet_vent.htm

    I have attached three pictures. In all it is about 3 feet horizontal distance from toilet to stack. The concrete saw found the lav drain so going to replace. But do I need to rework the connection into toilet drain?


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    Last edited by econjon; 09-18-2013 at 06:16 PM. Reason: addded link to pic I think is relevant

  2. #2
    Moderator & Master Plumber hj's Avatar
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    It is up to the inspector. If it were a washing machine, it would be a problem, but a sink SHOULD be okay. How did the city inspector get involved, since it is usually not a problem once the concrete is poured, especially years later.
    Licensed residential and commercial plumber

  3. #3
    DIY Junior Member econjon's Avatar
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    It's my own fault! I did the bathroom unpermitted originally. I self reported so I could get the appraiser to include it.

    Also, what do you think is the best way to redo cut up waste pipes? Seems I've got fittings all the way up the wall.

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
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    A toilet can be wet vented with a lav using a 3x2 santee on the vertical.
    The lav must be on the same floor as the toilet.

    The lav must also be vented by a santee if on it's vertical. I can't tell by the picture if that is the case here. You should have a vent coming out of the top of the santee where the trap arm exits the wall.

    Here are a few ways too.

    Last edited by Terry; 09-19-2013 at 09:37 AM.

  5. #5
    DIY Junior Member econjon's Avatar
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    Thank you Terry. There is a santee where the trap arm meets the vertical drain (behind drywall in 3rd picture). Is the 22.5 and Y below it ok where that drain meets vent stack?

  6. #6
    Moderator & Master Plumber hj's Avatar
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    why is there a "Y" above the sanitary tee?
    Licensed residential and commercial plumber

  7. #7
    DIY Junior Member econjon's Avatar
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    Quote Originally Posted by hj View Post
    why is there a "Y" above the sanitary tee?
    The wye (sorry I'm a novice) is accommodating a lav drain. That drain goes into from trap arm into wall and elbow strait down and then jogs over to the main stack/drain (picking up the wye). The other lav connects to the main stack via santee.

    Two other questions came up when I was replacing the cut up wet vent.

    1) I think I just used a 3" elbow below soil stack. Is that legal?
    2) I used 2" wet vent for toilet. Do I need to swap it out for 3"?

  8. #8
    Moderator & Master Plumber hj's Avatar
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    quote; That drain goes into from trap arm into wall and elbow strait down

    If the inspector sees THAT, he will turn the job down, because it is "illegal". In most cases the answers to #1 and #2 would be yes, but that can depend on your specific circumstances.
    Licensed residential and commercial plumber

  9. #9
    DIY Junior Member econjon's Avatar
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    Here's a bit more detail. the lav on the left has a santee and vent up and around the lav on the right. the lav on the right has the elbow in the wall and jogs down to the stack

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    Last edited by Terry; 09-20-2013 at 09:23 AM.

  10. #10
    Forum Admin, Expert Plumber Terry's Avatar
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    Then the lav on the left if fine, and the lav on the right needs to have a santee, not a 90 where it stubs out, with a vent going up too. Those can tie together in a revent at 42"

    The stack that this all ties into should be a vent from the lavs on up. No waste from a floor above.

  11. #11
    DIY Junior Member econjon's Avatar
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    Gotcha. This is all on one floor single story house. Since the vent for left lav crosses behind mirror, can I do either of these options?Name:  20130920_091427 v4.jpg
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  12. #12
    Forum Admin, Expert Plumber Terry's Avatar
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    I like option one. Santee on the line to the right, and then trap arm over to the left to pick up the lav.

  13. #13
    DIY Junior Member econjon's Avatar
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    Thank you. The inspector flaked out on me today. So I'll find out it everything's good to go on Monday.

  14. #14
    Moderator & Master Plumber hj's Avatar
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    His option #1 looks like a vent tied into the riser lower than 42". Option #2 MAY be high enough, but option #3 connecting to the horizontal vent would be best. I hope you realize that you would probably not have had any problem originally, but once you opened the "can of worms" the city had to get involved.
    Licensed residential and commercial plumber

  15. #15
    DIY Junior Member econjon's Avatar
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    Thanks hj, you're right option 1 isn't 42" but option 2 is. And believe, my my wife has helped me understand the can of worms I've opened many times!!!

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