Toilet vent options when stack is 6 feet away

Discussion in 'Toilet Forum discussions' started by ralsti, Apr 15, 2013.

  1. ralsti

    ralsti New Member

    Messages:
    4
    Location:
    Southern CA
    I'll preface this line of questioning by saying it's likely very stupid since I can't find anyone posting it previously. That's a great confidence builder!

    I'm moving my 2nd floor master bathroom toilet to the old shower spot, but to keep the proper drain size, I'm going to plumb back to the original toilet stack and vent that is 6 feet away. I will need to make a horizontal 90 degree turn which I understand needs to happen with a long sweep. I also understand I need 1/4 inch of slope per 1 foot on my toilet drain until it gets to a vent.

    The other option is to plumb the drain as above, but if there's concern about the 6 foot run and elbow, I could add a vent closer to the toilet instead of using the existing vent. I could accomplish that by increasing the size of the old shower vent or building a brand new vent and tying into the existing vent in the attic. Assuming we're this far, where would that vent connect into the toilet drain? I can't find a visual anywhere to understand my options, so pictures/diagrams appreciated. May also be helpful to know that the veritical 90 from closet flange will be headed toward the front of the toilet to get back to the old stack.

    Any guidance appreciated!
  2. wjcandee

    wjcandee Wise One

    Messages:
    1,818
    Location:
    New York, NY
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,486
    Location:
    Cave Creek, Arizona
    IF you have enough elevation to absorb the 1 1/2" higher toilet drain, then the existing vent is adequate. Installing an additional vent will NOT let you run the drain line with less than 1 1/2" additional slope.
  4. ralsti

    ralsti New Member

    Messages:
    4
    Location:
    Southern CA
    Thanks for the correction and the link, had reviewed the pdf but was worth a second look.

    As hj points out, I think I can make the slope work (joist plus the subfloor will be 10.25", plus flooring TBD), assuming I can find the right parts. I'll need a tight closet bend and a long sweep 90 I believe, but any guidance appreciated.

    Here's a picture for grins:

    photo_2.jpg
  5. ralsti

    ralsti New Member

    Messages:
    4
    Location:
    Southern CA
    Hi All,

    Thanks again for the advice. I've got one more question -

    What's the best way to connect a 3" toilet drain and a 2" shower drain to the stack at the same level? The toilet and shower are both planned to vent at the stack, although the toilet could vent before the stack if that made a wye acceptable on the branch instead of meeting at the stack. It's going to be almost impossible to put one san tee for the shower on top of the san tee for the toilet in the little space I have. I also understand the san tee fitting with a side inlet isn't up to code either.

    I've attached an updated picture with a red line showing the proposed shower drain path. Any guidance very much appreciated!

    photo_2.jpg
  6. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,244
    Location:
    Land of Cheese
    Not sure what code you are referring to, as a sanitary tee with a side inlet is one correct way to plumb it if you are connecting to a vertical stack. If the shower drain is longer than 5 feet from trap to vent, it will need to be re-vented.
  7. ralsti

    ralsti New Member

    Messages:
    4
    Location:
    Southern CA
    From what I've read, the sanitary tee with side inlet is ok by IPC/SPC, but not UPC. California PC has this clause:

    I read the exception for a "double hub sanitary tapped tee" as only allowing a sanitary cross, mainly because I can't figure out what a "double hub sanitary tapped tee" really looks like. If you've seen one of these wild animals, link/picture/drawing appreciated.
  8. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,244
    Location:
    Land of Cheese
    Sorry, I can't speak for anything that goes on in California. :confused:

    I would draw it up and bring it to my inspector to get his take on it.
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