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Thread: toilet vent size issue

  1. #1

    Default toilet vent size issue

    I posted this in remodeling - but it may be a better topic for this forum:

    I am remodeling a powder room on first floor of two story 1925 house. Used to have a pedestal and a toilet on one side and a shower opposite. shower sucked and was not needed, sink and toilet were crowded. Took out all three, and am putting in a large vanity/Lav where the sink and toilet used to be; and putting a new toilet where the shower was. The D and W part of the DWV are pretty easy. Venting, though . . . There is a 2" vent line (easy to use) for the new Lav. There is a nice, straight vertical 1.5" vent that goes up through the roof and down to the crawl space, not 2 horizontal feet from where the new closet flange/toilet will be. I REALLY don't want to change that to 2" -- Very easy to hook up as is, totally a bear, maybe not even possible to change it. So -- can i put in one single toilet with a 3 inch drain and a 1.5 inch vent ?! Is it code and, more importantly, will it work? Thanks in advance.

    Also - what alternatives? AAV in crawl space??

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Default

    An AAV needs to be above the floor plane, you can't put it under the toilet. You could put in in the bathroom behind a removeable panel, but it must be accessable for repair and if there is a clog, above the place where it could leak.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3

    Default

    yeah i am not a fan of AAVs anyway.
    What about running about 10 feet "horizontal" in the crawl space over to the wall with the 2 inch line, going up and y-ing in to that vent (how far above sink does that have to be?) is it ok to have a long horizontal (properly inclined) before it goes up to the roof? thanks again.

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
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    The toilet can be vented within six feet.
    Most codes require at least a 2" vent for the toilet.
    Will 1.5" work? Yes.

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