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Thread: DWV Diagram

  1. #1
    DIY Junior Member luthar28's Avatar
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    Default DWV Diagram

    Of course, the wife asked if she could move the toilet 'over there'. Me, being dumb, said 'yeah, no problem'.

    Problem. I'm having a heck of a time with venting. The basement is open and unfinished. Single story. These are some of the details:

    Distance from vent stack:
    - toilet: 7 feet (3")
    - tub: 10.5 feet (1.5")
    - sink: 2 feet (1.5")

    So I'm going to need to vent the toilet and tub, correct? This is what I've put together...don't know if it's the most economical or not (doesn't seem like it). Suggestions or comments welcome -- I could be completely wrong on this.

    (Note, the 3' on the toilet is supposed to be 3" - the pipe is 7' long).

    Name:  Doc - Nov 26, 2012 7-50 PM.jpg
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    Last edited by luthar28; 11-26-2012 at 05:05 PM. Reason: Correction

  2. #2
    Test, Don't Guess! cacher_chick's Avatar
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    Default

    The 2-D drawing does not help us much. If it helps, the tub can drain to the the 3" line off the WC, as long as the connection is made after the vent.

  3. #3
    Forum Admin, Expert Plumber Terry's Avatar
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    The pipe on the right..........is that existing?
    Is there anything coming down from above?
    Or anything down below?

  4. #4
    DIY Junior Member luthar28's Avatar
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    Quote Originally Posted by Terry View Post
    The pipe on the right..........is that existing?
    Is there anything coming down from above?
    Or anything down below?
    The pipe on the right is existing....everything else is simply planned.

    Nothing above or below.

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    Forum Admin, Expert Plumber Terry's Avatar
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    Then I would use the toilet vent to wet vent the tub.


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    DIY Junior Member luthar28's Avatar
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    Quote Originally Posted by Terry View Post
    Then I would use the toilet vent to wet vent the tub.

    Thanks. Great diagram. So you're referring to the bottom portion, correct?

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    Forum Admin, Expert Plumber Terry's Avatar
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    So you're referring to the bottom portion, correct?
    Yes. This gives the basic concept.

    A tub waste is 2" with a 1.5" trap arm and 1.5" vent.
    A lav can use a 1.25" trap and waste, but most small DWV pipe is 1.5"
    Back before the 60's, you would see 1-1/4" in copper DWV and galvanized.
    Last edited by Terry; 11-27-2012 at 10:10 AM.

  8. #8
    Moderator & Master Plumber hj's Avatar
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    Your "concept" as drawn is correct. Now all you have to do is install it correctly, which is not always a given. I hope that 10' tub drain is NOT all 1 1/2" pipe. We do not know enough about the room's layout to tell you if it is the best, or even most economical, method.
    Licensed residential and commercial plumber

  9. #9
    DIY Junior Member luthar28's Avatar
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    Quote Originally Posted by hj View Post
    Your "concept" as drawn is correct. Now all you have to do is install it correctly, which is not always a given. I hope that 10' tub drain is NOT all 1 1/2" pipe. We do not know enough about the room's layout to tell you if it is the best, or even most economical, method.
    Should I be using 2" in that 10 foot tub drain stretch?

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