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Thread: New bathroom drainage - Plan of attack

  1. #1

    Default New bathroom drainage - Plan of attack

    With the help of everyone here, I think I've figured out how I'm going to tackle the job. My only hang-up is venting. The picture below shows where I plan to tap-in to the existing plumbing, but my concern is that there is only 1 - 2" vent that I'll be using a reducer tee to tap in for the sink.

    The 2" vent shown connects to all the other vents in the house. The drain, obviously, runs under the slab to an ejector pit.

    Will this 2" vent be sufficient for a bathtub/shower at the end of the line, a toilet and a sink? The pipes coming up on either side of the toilet, I believe, are unneccesary and I'm just going to cut them off 6" above the floor and cap them. I will have access to this wall as I am not finishing the backside of it.


  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    If you are having a full bath, starting from left,
    Lav, Toilet, Tub/Shower,
    You will need all three vents.
    They can tie together at 42" above the floor as a 2" line.

    Do Not cut off and cap.
    Those pipes sticking up are vents.

    Last edited by Terry; 02-14-2008 at 08:33 AM.

  3. #3

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    So ultimately instead of cutting and capping the pipes on either side of the toilet I can simply continue thep up to the soffit and tie them in with the 2" vent and I won't need to install any additional venting? Therefore, the pipe to the right of the toilet will vent the tub/shower, the one to the left of the toilet will vent the toilet and the 2" I can keep as a wet vent for the sink?

    When you say 2" line you mean they tie into the 2" line, correct? The existing vents are 1 1/2 inch that I'll take up 42" and tie into the 2"?

    Thanks for the reply. This website has been a godsend for me.
    Last edited by kregas; 02-14-2008 at 08:42 AM.

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
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    It shold look something like this
    Attached Images Attached Images  

  5. #5

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    Thanks for the fast reply. I think I'm on my way.

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