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Thread: Toilet wet vent under IPC

  1. #1
    DIY Junior Member brewdesign's Avatar
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    Default Toilet wet vent under IPC

    I've looked through quite a few threads looking for specifics on using a wet vent on a toilet arm under IPC. From what I can tell, IPC lists no specific toilet vent requirement. In the attached drawing, a 2nd floor bathroom group is draining into a new 3" stack. The stack runs down to the main floor then under the kitchen picking up a kitchen sink then wyes into the building drain.

    The 3" toilet arm has a 2" wet vent that connects through a combo then runs 45* before running vertical through the bathroom wall. Inside the wall a san tee accepts sink waste then above that (above flood rim) two tees brach in the sink and tub dry vents. The vent continues through roof. The tub waste drains via a 2x3 wye into the 3" stack under the toilet arm (due to space constraints in the joist bay).

    So the question is whther or not this is an acceptable arrangement under the IPC. I think this fails under UPC since the toilet vent would seem to be required on the arm before the sink drains in.

    Thanks in advance.Name:  bath2.jpg
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    Last edited by brewdesign; 12-28-2012 at 06:47 AM.

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    DIY Senior Member Hammerlane's Avatar
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    The part of the 2" that leaves the water closet 3" line to the right cannot be on the horizontal

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    Test, Don't Guess! cacher_chick's Avatar
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    Quote Originally Posted by Hammerlane View Post
    The part of the 2" that leaves the water closet 3" line to the right cannot be on the horizontal

    Can you explain that further? It is a wet vent.

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    DIY Junior Member brewdesign's Avatar
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    It is drawn poorly. The branch rises at 45 degrees before going vertical. Thanks for the responses.

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    DIY Senior Member Hammerlane's Avatar
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    Quote Originally Posted by cacher_chick View Post
    Can you explain that further? It is a wet vent.
    Im having trouble uploading photos. But look at his diagram and start right next to the words "water closet". Follow that 3" and at the point where the 2"(from the lavatory) ties into the 3", the section of 2" appears to be on the horizontal. Are you saying that because that is part of a wet-vent, the horizontal is OK?

    Thanks

  6. #6
    Test, Don't Guess! cacher_chick's Avatar
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    A wet vent can be horizontal, and the IPC specifically approves went venting a bath group through the lavatory. The distance between the trap and it's vent must still be within what is allowed for the pipe diameter.

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    Moderator & Master Plumber hj's Avatar
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    My previous answer was either lost or deleted. SInce the toilet drain is washed by the lavatory drain, the horizontal section is proper. You might not even need the "loop" for the lavatory and vent, depending on its distance from the vent, or if you can relocate the vent closer to the sink.
    Licensed residential and commercial plumber

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    DIY Junior Member brewdesign's Avatar
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    Thank you again HJ. I didn't realize that the section in question could be horizontal but that makes sense. I ran that 2" vent section up at a 45 because I originally intended for it to be a dry vent. I later realized it could be converted to a wet vent to simplify the lav routing that would have been under the cramped joist bay. I finished the rough in per the drawing, albeit with a vent loop that was probably not necessary, but I already boared the holes and just went with it.

  9. #9
    Moderator & Master Plumber hj's Avatar
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    In fact, if the situation allowed it, I would have offset the vent so it was behind the lavatory with a 2x1 1/2" tee for the sink drain.
    Licensed residential and commercial plumber

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