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Thread: Venting top floor bathroom

  1. #1
    Plumber canton's Avatar
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    Jul 2005
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    Default Venting top floor bathroom

    I'm stack venting a top floor bathroom. The 3" waste pipe comes up from a 4" waste in the cellar. The 3" waste comes up to the bathroom and 90's over about a foot where a wye and eighth goes up a wall and vtr's. The 3" run goes over and picks up the W.C and the tub which are about 5' away. I also have a lav that drains into the wye and eighth about 15" above, and above that a 2" vent that vents a kitchen sink on the 1st floor. The 2" vent for the kitchen sink ties in 6" above the lav. Does anyone see any problems with this setup?

  2. #2
    Tradesman Plumber Kristi's Avatar
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    Jan 2005
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    Default head swimming with sizes...

    It sounds like a good arrangement to me, at first read. I have mentally drawn it up (lol), and seems like it's more than enough! 3" through the roof? I think you're in good shape there... sounds like everything is in close proximity and wouldn't require more than one roof penetration.
    nothing wet venting, right? Make sure all the fittings for venting are the opposite of drainage... upside down!
    Last edited by Kristi; 08-25-2005 at 04:42 PM. Reason: additional comment

  3. #3
    Plumber canton's Avatar
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    Default

    Quote Originally Posted by Kristi
    It sounds like a good arrangement to me, at first read. I have mentally drawn it up (lol), and seems like it's more than enough! 3" through the roof? I think you're in good shape there... sounds like everything is in close proximity and wouldn't require more than one roof penetration.
    nothing wet venting, right? Make sure all the fittings for venting are the opposite of drainage... upside down!
    Thanks, I'm in Mass. and I believe when your venting on the flat you have to use a wye and not a T., no problem there I just rolled the eighth to get a straight run up and out.
    One more question, can you over vent, well not so much that..what I'm wondering is will an inspector have a problem with overkill on venting.

  4. #4
    General Contractor Carpenter toolaholic's Avatar
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    Jul 2005
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    Marin Co. Ca.
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    829

    Default no

    venting, drains , and waste are determined by total fixture units. it,s an ez read ! pick up a book. i find it all interisting! maybe i need a hobby

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