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            DIY Message Boards  Hop To Forum Categories  Home Improvement  Hop To Forums  Plumbing    Toilet vent question - vent off the back of combo wye/45
        Toilet vent question - vent off the back of combo wye/45 Sign In/Join 
        First let me say thank you to all of the people who give freely of their time answering questions here - it has been very helpful to read through all of the older posts. I think I have learned a few things from it, but if nothing else I have developed a new appreciation for plumbers.

        My question pertains to venting a toilet where the soil pipe is on the opposite wall, and the only place to vent is on the wall behind the toilet.

        - I am under IPC 2006.
        - I have some flexibility on elevation, but I plan to finish the basement so I want to use a compact design if possible.
        - There are no other fixtures that will be connected to this plumbing.
        - The soil pipe is 9 feet away, 24 inches lower, and has no vent nearby.

        I have searched extensively, and while this would work well for me:

        toilet flat vent

        My understanding, though, is that the vent would either have to be 45 deg the whole way (no flat section) or it would have to be a wet vent. Making it 45 deg would increase the total elevation significantly.

        I have come across suggestions that the attached image would work, but it seems suspect to me.


        1. Would this configuration pass inspection? (2006 IPC)
        2. Do I need the cleanout?
        3. If this won't work / isn't up to code, do you have any suggestions for a configuration that would work while minimizing vertical space required?

        Many thanks!

        toilet vent
        Posts: 1 | Registered: Nov 30, 2013Reply With QuoteReport This Post
        Picture of Frodo
        posted Hide Post
        the image you posted was up to code
        as long as your vent wye is rolled up on a 45 degree angle and the distance from the closet bend to the vent wye is 3x the diameter of the pipe... no co is needed.
        the code states that the fixture itself, can be removed and used as a co..
        altho....i like to install a wall co behind the tank....the same size as the drain piping....remove tank snake out drain
        the fittings you have laid out on the floor, are not legal...your vent has to be behind the fixture being vented,,,so that the base of the vent can be washed out....if not it will stop it is laid out, the combination is not vented

        go with the image you submitted
        if you can not make that work..there are 2 other options to get a variance from the plumbing inspector, to not roll the vent of a 45 degree angle..ONLY if no other must get the variance 1st
        second way is....

        as the picture shows....your vent can be MAX..10' away from the toilet center of tee to center of 90....NOT a 10' run of pipe
        i recomend this option ONLY in extreme conditions....a vent to far away, is trouble
        but is legal
        the fittings you would use...a 3" sanitary tee, a 4"x 3" closet bend
        the tie in to your sewer you have provided no info so i have no comment

        This message has been edited. Last edited by: Frodo,

        click here
        Posts: 4089 | Location: I live in southern mississippi | Registered: Jun 01, 2008Reply With QuoteReport This Post
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