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Thread: Help on DWV Diagram

  1. #1
    DIY Member Drewski123's Avatar
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    Default Help on DWV Diagram

    Can the tub drain use the DWV 3" vent? The distance between the tub and the DWV 3" vertical part is less then 15". Or, it has to vent using its own 1.5" vent, and then the 1.5" vent would merge with the 3" vent in the attic?

    Thanks,
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    Last edited by Drewski123; 10-25-2011 at 03:50 PM.

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    You can't run a toilet down a tub vent in Seattle, or anywhere.

    You will need to run a 1.5" vent between the tub p-trap and the stack and then either go through the roof, or revent at 42" above the floor.


  3. #3
    DIY Member Drewski123's Avatar
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    Thanks Terry. My initial plan was to run the 1.5" vent, but wanted to make sure.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Just "running" a 1 1/2" vent is NOT enough, it has to be run CORRECTLY.
    Licensed residential and commercial plumber

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