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Thread: Plumbing Bathroom in basement - help

  1. #1
    DIY Junior Member
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    Default Plumbing Bathroom in basement - help

    I am installing a toilet and sink in my basement. There is an existing 3" drain pipe that ties to 2 other toilets upstairs. The pipe goes down my basement wall and under the concrete. I broke out the concrete and will tie my toilet into the 3" pipe (18" away). I will also tie my sink into the same 3" pipe prior to where it hits the concrete.

    Is this OK? Also, do I have to run a separate vent or can I vent throug the 3" pipe? If I can use the existing 3" pipe do i need to tie into or just use my toilet connect as explained above. I can find any other vent pipe?

    Thanks,

  2. #2
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    First you can not have three toilets on 3".
    Second you do need a separate vent for the new 1/2 bath.

    John

  3. #3
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    I now understand the 3 toilets on a 3" pipe is not code. Assuming I find a different pipe to tie into for the toilet what is the best method to vent the toilet and sink? Any guidance is very much appreciated.

  4. #4
    Test, Don't Guess! cacher_chick's Avatar
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    Any vent must terminate through the roof. If you connect to any existing vent it must be connected above the flood rim of the highest fixture on that vent.

  5. #5
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    Welllllllll...... actually, by the latest edition of the IPC, 3 toilets can go on a 3" line.

  6. #6
    Forum Admin, Expert Plumber Terry's Avatar
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    UPC does three on 3"

  7. #7
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Sorry guys I guess I'm old school. We were allowed three on 3" on a vertical line. Back in the days of 5 gal. per flushes.

    John

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