Basment bathroom renovation - Can I use an internal coupling on a vent

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by dmcrx7, Feb 18, 2011.

  1. dmcrx7

    dmcrx7 New Member

    Messages:
    5
    Location:
    Roanoke, VA
    My home was roughed in during construction with a toilet drain, a 2" drain stubbed up behind the toilet drain, 1 1/2" tub drain stub, and a 2" drain stub for the washer.

    At close, they installed a sink on the 2" drain behind the toilet, with a 1 1/2" vent. They also installed the washer drain line with a 1 1/2" vent. These join below the first floor, then run up to the roof.
    I am unsure how or if the toilet and bath tub lines were vented during construction. The toilet is at least 12 ft from the main stack.
    I want to install a bathtub and toilet, and ensure they are vented properly. I would like to replace the 1 1/2" vent behind the toilet with a 2" vent and replace the rest fo the 1 1/2" vent with 2" all the way to the roof. However, the house is two story, so I cannot get to the middle baseplate to enlarge the hole. It is large enough for a 2" pipe, but not the coupling.
    Can I use an internal pvc coupling on a vent line?
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,240
    Location:
    Cave Creek, Arizona
    i suppose you could IF you can find one. I have never seen them in any store with the normal stock of fittings.
  3. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,236
    Location:
    Land of Cheese
    If you have a straight drop all the way through you could send a 20' stick down through the roof.
  4. dmcrx7

    dmcrx7 New Member

    Messages:
    5
    Location:
    Roanoke, VA
    thanks

    thanks, but I plan on going horizontal in the attic to get it behind the roofline, so it's not on the front of the house.

    I'd have to order the fitting online.

    Would the toilet and tub rough-ins have been wet vented by the builder?

    I am assuming I need to properly vent these myself. I have verified that the tub drain has a working trap.

    Attached Files:

    Last edited: Feb 18, 2011
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,240
    Location:
    Cave Creek, Arizona
    IF it was "really" installed according to your drawing, then the downstairs tub is not only NOT vented but could be subjected to a "suction" every time the toilet is flushed.
  6. dmcrx7

    dmcrx7 New Member

    Messages:
    5
    Location:
    Roanoke, VA
    Fair enough, it's hard to see through 4 inches of concrete, but after checking again, the tub drain flows right, connecting to the w/c line, THEN going toward the main.

    Am I correct in assuming the builder did not have to vent these capped stubs in order to meet code, so I have to?

    At least he put a trap on the tub drain.
    Does my vent plan look adequate?
    Last edited: Feb 19, 2011
  7. dmcrx7

    dmcrx7 New Member

    Messages:
    5
    Location:
    Roanoke, VA
    Also,

    Can I tie the new 2" vent into the existing 2" main stack vent in the attic?

    The main stack is actually 3", btw.
  8. dmcrx7

    dmcrx7 New Member

    Messages:
    5
    Location:
    Roanoke, VA
    I revised the drawing to match.

    A couple of questions I still have:
    1) Is my laundry sink ok? Or do I need another vent?
    2) Can I tie into the existing 2" vent in the attic or do I need to go through the roof?
    3) The bathtub appears to be wet vented, since the trap is under the concrete. The only stubs are the 2" behind the w/c next to the lav, and the 2" next to the washer drain. Is this correct?

    Attached Files:

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