DWV Diagram

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by luthar28, Nov 26, 2012.

  1. luthar28

    luthar28 New Member

    Messages:
    4
    Location:
    Ontario
    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).

    Doc - Nov 26, 2012 7-50 PM.jpg
    Last edited: Nov 26, 2012
  2. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,259
    Location:
    Land of Cheese
    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. Terry

    Terry Administrator Staff Member

    Messages:
    15,280
    Location:
    Bothell, Washington
    The pipe on the right..........is that existing?
    Is there anything coming down from above?
    Or anything down below?
  4. luthar28

    luthar28 New Member

    Messages:
    4
    Location:
    Ontario
    The pipe on the right is existing....everything else is simply planned.

    Nothing above or below.
  5. Terry

    Terry Administrator Staff Member

    Messages:
    15,280
    Location:
    Bothell, Washington
    Then I would use the toilet vent to wet vent the tub.

    [​IMG]
  6. luthar28

    luthar28 New Member

    Messages:
    4
    Location:
    Ontario
    Thanks. Great diagram. So you're referring to the bottom portion, correct?
  7. Terry

    Terry Administrator Staff Member

    Messages:
    15,280
    Location:
    Bothell, Washington
    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: Nov 27, 2012
  8. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,018
    Location:
    Cave Creek, Arizona
    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.
  9. luthar28

    luthar28 New Member

    Messages:
    4
    Location:
    Ontario
    Should I be using 2" in that 10 foot tub drain stretch?
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