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Thread: Plumbing two new bathrooms one above the other and then to main stack?

  1. #16
    Forum Admin, Expert Plumber Terry's Avatar
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    I tweaked the drawing.

  2. #17
    DIY Junior Member tireiron's Avatar
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    Quote Originally Posted by Terry View Post
    I tweaked the drawing.
    Thanks! I see you kept the 2" vent on the WC on the second floor (hj indicated it was uneccessary but both of you do not always agree). I can easily keep it. Does the first floor require adding similar venting at the WC or is the wet vent from the sink adequate?

    Note: I also have planned a cleanout on the bottom of the vertical stack even though it is not indicated on the drawing.

  3. #18
    Moderator & Master Plumber hj's Avatar
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    Use the side inlet tee for the toilet and shower, (without ANY individual vents), then run the sink to the separate Y installed below it.
    Last edited by hj; 01-05-2013 at 12:56 PM.
    Licensed residential and commercial plumber

  4. #19
    DIY Junior Member tireiron's Avatar
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    Quote Originally Posted by hj View Post
    Use the side inlet tee for the toilet and shower, (without ANY individual vents), then run the sink to the separate Y installed below it.
    I will use the side inlet tee as that is a very short run for the shower and simple. Is there an argument for running the sink waste to a sani-T vs the wye connection after the WC? Maybe as a "better" plan to isolate the WC? I think using the wye on the WC seems simpler to plumb.
    Name:  Lav to wye vs to sani-T.jpg
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  5. #20
    Moderator & Master Plumber hj's Avatar
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    Either way is suitable. Lav to Y the stack is the vent for the shower and the lav is the wet vent for the toilet. Lav to T, the stack is the vent for the shower and the toilet and the sink has its own vent.
    Licensed residential and commercial plumber

  6. #21
    DIY Junior Member tireiron's Avatar
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    Quote Originally Posted by hj View Post
    Either way is suitable. Lav to Y the stack is the vent for the shower and the lav is the wet vent for the toilet. Lav to T, the stack is the vent for the shower and the toilet and the sink has its own vent.
    Great. So just to finish up...the first floor "powder room" venting looks ok? As long as I wet vent the WC with the sink 2" it is ok, correct?

    Name:  Both floors together.jpg
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  7. #22
    Moderator & Master Plumber hj's Avatar
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    Looks good and MUCH simpler than when you started. Now all you have to do is actually install it that way.
    Licensed residential and commercial plumber

  8. #23
    DIY Junior Member tireiron's Avatar
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    Thank you!

    I'll start tomorrow---and stick with the plan.

  9. #24
    DIY Junior Member tireiron's Avatar
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    To lower the horizontal waste line from the sink to connect it to the stack do I use a pair of 90s and sani-T or can I use a 45 to a wye? It needs to connect beneath the (3x3x3x2) hub for the WC and shower. It comes in at nearly the same level (just a 1 1/2" below the center line of the WC waste (so I cannot tie into it with a wye).

    Name:  Both floors together.jpg
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