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Thread: Sanitary tee on back for venting toilet

  1. #1
    DIY Junior Member bandrewfox's Avatar
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    Default Sanitary tee on back for venting toilet

    Hi, I'm a new member here and have been browsing the forum trying to get an answer to this question, but it seems like half the threads say it is ok to do this and half say it is not ok.

    My question is: can I use a 3" sanitary tee on its back with the 2" opening going straight up vertically (as a vent - with nothing draining into it) on a horizontal 3" drain directly from the toilet's floor flange (about 1 foot away from the san tee)?

    I certainly understand that san tees can only be used vertically for drainage, but is this considered drainage or venting? Toilets seem to be an exception to some rules because their trap is inside the fixture...

    If you say "no, san tee cannot be used in this situation", then I will have to use a wye for the 2" vent - but I can't use the wye with the 2" vertical since there is not enough room in my joist area for the extra street 45 fitting. In this case, my next question is, how much do I need to "roll" my wye. Does it have to be 45 degrees or is something like 10 degrees ok? I know it can't be flat.

    I am the homeowner doing the work and this is in Seattle - with King County doing the plumbing inspection.

    Thanks so much!
    Last edited by bandrewfox; 07-22-2012 at 05:15 PM. Reason: additional question

  2. #2
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    If the sanitary tee is down stream from the toilet it's OK.

    John
    Last edited by johnjh2o1; 07-22-2012 at 05:28 PM.

  3. #3
    Forum Admin, Expert Plumber Terry's Avatar
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    I am the homeowner doing the work and this is in Seattle - with King County doing the plumbing inspection.
    In Seattle, which uses UPC code, they will expect a combo or wye fitting if it's on it's back.
    You may need to drill a larger hole up through the floor. Or...........you can try the Santee and see if the inspector notices.

    Here is a nice link to Bert Polk's plumbing tips
    Last edited by Terry; 07-23-2012 at 07:06 AM.

  4. #4
    In the Trades Tom Sawyer's Avatar
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    Downstream or there is waste upstream and the 2" straight up works for IPC
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

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