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Thread: 2nd floor powder room directly over exist. basement full bath

  1. #1
    DIY Junior Member baltimorecaesar's Avatar
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    Default 2nd floor powder room directly over exist. basement full bath

    I'm in the process of installing a 2nd floor powder room directly over an existing full bath in my basement which I am also in the process of a gut/remodel as well. The powder room will take the place of an existing closet, so I need to run all new plumbing to service the toilet and sink. I sketched up a diagram of the waste-vent system in CAD to help illustrate what I'm trying to run. All horizontal drains & vents will be sloped at least 1/4" per. foot.

    Thoughts? Suggestions?

    Thanks in advance
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  2. #2
    Plumber jimbo's Avatar
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    No vent can be less than 45 when below 42" above the floor. No inspector will allow a loop vent on that sink. You must tie a proper vent into the vent-to-roof.

    Basically, there is NOTHING in your diagram which will pass code.

  3. #3
    In the Trades Tom Sawyer's Avatar
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    Yep and furthermore that waste line needs to go all the way to the basement and tie in to the lateral there if the "stack" is the vent for the downstairs fixtures.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  4. #4
    DIY Junior Member baltimorecaesar's Avatar
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    alright, how about this:
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    Also, there is a separate dry vent for the basement fixtures.

  5. #5
    In the Trades Tom Sawyer's Avatar
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    The lav is not vented
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  6. #6
    DIY Junior Member baltimorecaesar's Avatar
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    Quote Originally Posted by Tom Sawyer View Post
    The lav is not vented
    The problem is that the wall that the sink is against is an exterior load bearing wall, so I wanted to avoid boring through the wall studs to get the sink vent to the existing vent stack. The only other solution I could come up with, would be to run the sink vent straight up the wall, go through the top plate, tear out the ceiling and T into the vent stack between the 2nd story ceiling and the 3rd story floor (See revised drawings).

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    Is this better?

    And thanks for the helpful advice all.

  7. #7
    In the Trades Tom Sawyer's Avatar
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    Yep, that be what you need to do to vent the sink properly
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  8. #8
    DIY Junior Member baltimorecaesar's Avatar
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    Quote Originally Posted by Tom Sawyer View Post
    Yep, that be what you need to do to vent the sink properly
    Cool beans. Thanks again Tom and Jimbo.

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