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

  1. #1
    DIY Junior Member dmcrx7's Avatar
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    Cool Basment bathroom renovation - Can I use an internal coupling on a vent

    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. #2
    Moderator & Master Plumber hj's Avatar
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    i suppose you could IF you can find one. I have never seen them in any store with the normal stock of fittings.

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    Test, Don't Guess! cacher_chick's Avatar
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    If you have a straight drop all the way through you could send a 20' stick down through the roof.

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    DIY Junior Member dmcrx7's Avatar
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    Default 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.
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    Last edited by dmcrx7; 02-18-2011 at 08:39 PM.

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    Moderator & Master Plumber hj's Avatar
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    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.

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    DIY Junior Member dmcrx7's Avatar
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    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 by dmcrx7; 02-19-2011 at 06:36 PM.

  7. #7
    DIY Junior Member dmcrx7's Avatar
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    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. #8
    DIY Junior Member dmcrx7's Avatar
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    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?
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