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Thread: Toilet drain / vent for new bathroom

  1. #1
    DIY Senior Member jeff_bathroom's Avatar
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    Default Toilet drain / vent for new bathroom

    Hi,
    I've attached a photo of my proposed drain / vent for the toilet. The
    pipes shown are not glued yet. I wanted to be sure this configuration is ok for code and whatnot.
    What the photo is showing from top down is the flange, then a 45 degree elbow, then about 24" of 3" pipe connecting to a 3x2 Y to vent. I could not vent behind the toilet due to electrical panel behind the toilet wall, so I'm venting up the wall adjacent and next to the toilet.
    Can anyone tell me if this is ok to go with ?
    Attached Images Attached Images  

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Default

    That would work in Washington State for a toilet vent.

  3. #3
    DIY Senior Member jeff_bathroom's Avatar
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    Default

    Are you saying it's a bad setup? Can you please
    help a little more w/ details? Thanks.

  4. #4
    Plumbing heating and cooling contractor NaumoffPlumbing's Avatar
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    Default

    Where are you located? Are you getting the job inspected?
    It will work. Different areas have stricter codes then some.

    Terry, I am a new guy so I hope I am not stepping on your toes.

  5. #5
    Forum Admin, Expert Plumber Terry's Avatar
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    Not stepping at all.

    The reason I even mention codes and location, is inspectors being who they are, and how large this country is, there will always be some differences.

    What I see are nice wye fittings and 45 els. It looks nice.
    The toilet is one of the few fixtuers that can be vented this way.

  6. #6
    DIY Senior Member jeff_bathroom's Avatar
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    Default

    Hi Naumoff,
    I'm in GA. I really appreciate your response. I'm sort of getting the impression that coming straight off the flange at 45 degrees for several feet then venting is a little peculiar. I've seen pictures similar to this in one of my plumbing books.
    I am considering changing this setup so that the drain pipe goes down
    vertically from the flange to just below the joists (about 8.5 inches) then doing a 90 degree and heading directly under the 2" vent pipe connecting to it and the 3" drain using a 3x3x2 combo. I suppose that would be more normal
    than what I have in the photo. But, I don't know how far below the flange I'm "allowed" to go before the 90 degree turn. I need to be below the joists.
    The thing that plumbing books don't talk much about is whether it's ok to run drain pipe at various angles that are not the usual vertical or horizontal with the proper slope per pipe diameter. I know there's issues with fluid speed at different angles, but not much more than that.
    Suggestions welcome ! Thanks again...

  7. #7
    DIY Senior Member jeff_bathroom's Avatar
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    Default Question about toilet flange

    Hi,
    reading my various plumbing books related to toilet connections, I usually see a "closet bend or closet flange" which is a 4" flange with a gradual reduction to 3" diameter. However, I have yet to see one of those in Lowes or Home Depot. Instead I see a short 4" flange with an immediate reduction to 3" such that you connect to a 3" pipe from that small flange. I'm assuming that's the preferred method these days over a closet bend. Is that so?
    I am still wrestling with this connection because immediately below is a cinderblock wall that is in the way by a little over an inch. What I'd like to do is come off of the flange with an 1/8 bend, then down an inch or so and add another 1/8 bend in the opposite direction to bring back to vertical and get around the cinderblock.
    Is that an acceptable/practical/in-code toilet connection ?

  8. #8
    Moderator & Master Plumber hj's Avatar
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    Default toilet

    The reason the closet bend into the tee is "normal" is that it is the way most plumbers would do it. But that does not make it more "right" than your way. The "right" way for any installation is the one that is best for that particular set of circumstances. Unless the inspector has some particular reason for not liking it, your way is perfectly okay. I might have come straight down from the toilet flange into a Y for the vent before offsetting it to the drain connection, but that does not make it any better than your design. If would just have used fewer fittings.

  9. #9
    DIY Senior Member jeff_bathroom's Avatar
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    Default thx

    Thanks hj,
    I appeciate your help. I'll tape these together again and post
    another photo and see if it looks ok.

  10. #10
    DIY Senior Member jeff_bathroom's Avatar
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    Default Different Toilet Drain config...

    Hi,
    I've changed the drain/vent config. What say ye ?
    Look better ?
    Attached Images Attached Images   

  11. #11
    Forum Admin, Expert Plumber Terry's Avatar
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    Frankly, I like the old picture better.

    The new picture would not fly where I plumb.
    The 3x2 santee would need to be replaced with a 3x2 wye or combo fitting.

  12. #12
    Moderator & Master Plumber hj's Avatar
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    Default vent

    The system is cleaner that way, just replace the tee with a combination Y-1/8 bend and you should be home free.

  13. #13
    DIY Senior Member jeff_bathroom's Avatar
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    Default Thanks for the look...

    Terry,
    I thought w/ my old config that the 2 foot long 45 degree drain pipe
    was sort of a no-no, which is why I went to this new configuration.
    HJ,
    I think I know what a Y-1/8 bend is, but I'll need to look it up to be sure.
    Not sure why though that the existing T is an issue. I wondered about the sanitary T; but I thought it was more that you had to have a sanitary T for the drain line rather than it being an issue used in a vent. Thought wrong, I guess.
    Thanks again guys. I'm almost ready to kick this project into gear.

  14. #14
    DIY Senior Member jeff_bathroom's Avatar
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    Default Y 1/8 bend

    Is that the piece I have in my first photo ?

  15. #15
    Moderator & Master Plumber hj's Avatar
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    Default y

    That fitting with a street 45 would be equivalent to the combination, just two pieces instead of one.

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