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Thread: 3rd Floor Bathroom

  1. #1

    Default 3rd Floor Bathroom

    I'm remodeling my 3rd floor bathroom. In order to maximize my bathroom, I would like to put a 90 degree elbow in my existing 4" cast iron plumbing stack (it currently runs straight through the middle of the bathroom and exits the roof immediately above the bathroom), run about 3 feet of horizontal pvc at a 1/4" pitch, and then put another 90 degree elbow in and vent it through the roof.

    In the 3 foot PVC section mentioned above (horizontal PVC with 1/4" pitch) I would like to tie in the toilet drain pipe. I could vent the toilet as well.

    Is this against code?

    I apologize, I posted a similar question yesterday, but I'm not sure I was clear in what I was trying to do.

  2. #2
    DIY Senior Member seaofnames's Avatar
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    Dont use the vent from the lower floors to act as a drain for the toilet, or anything for that matter.

  3. #3

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    THe house only has one vertical Waste and Vent Stack. This is the stack/Vent I'm proposing putting the 90 degree elbow in. Is this still a problem?

    Thanks for your quick response and help.

  4. #4
    DIY Senior Member seaofnames's Avatar
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    Check code in your area for requirements of how many fixtures you can drain into one stack.

  5. #5

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    Good advice on checking with local code. If they say it's okay to have 3 baths going into one stack, do you think its okay to do what I origally proposed above?

    THanks for all your help. THis website is pretty amazing.

  6. #6
    Jack of all trades frenchie's Avatar
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    That configuration is pretty common here, in older buildings.

    I'm pretty sure the answer is "no". The whole thing has to be straight up & down, no offsets or elbows of any kind, for it to work properly.

    If you think about it for a couple minutes, I'm sure you can see why...?
    Last edited by frenchie; 09-22-2009 at 10:29 PM.
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  7. #7
    Journeyman Plumber jdgoodman's Avatar
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    You can not drain a fixture on one floor into the vent of another fixture on the floor below. The toilet on the bottom level is most likley re-vented but the one on the main level is not. I have seen what you want to do done in many homes and it works fine but it is not to code.

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