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Thread: Connect lav drain directly into toilet

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  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.

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    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

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