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  1. #1
    Join Date
    Sep 2008
    Posts
    4

    Default Tying into existing plumbing

    I'm planning on adding an upstairs bathroom in my house and I've gotten two different opinions from plumbers I've had look at the job. There is an exisiting cast iron vent pipe which looks to be 4 or 5", (which is also the drain for the downstairs toilet) running through the space where I plan to add the upstairs bathroom. One plumber says I can tie my new bathroom into this pipe for drainage and the other plumber says I must install an entirely new drain pipe with a separate vent. Who's right?

  2. #2
    Join Date
    Feb 2008
    Location
    Memphis, not Egypt
    Posts
    183

    Default Re: Tying into existing plumbing

    The second plumber is right you do not stack another bathroom group over a toilet. The new plumbing should tie in downstream of the toilet and its vent. The new plumbing's vent cantie into the existing vent with its offset starting 6 inches above the floodrim of the highest fixture.

  3. #3
    Join Date
    Sep 2008
    Posts
    4

    Default Re: Tying into existing plumbing

    To i.m.plummin from Zymes: Thanks so much for your feedback. I really appreciate it.

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