questionable rough-in diagram

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by magicalpig, May 18, 2006.

  1. magicalpig

    magicalpig New Member

    I posted this to the remodeling group today, since I AM remodeling, but I think it's more of a rough-in question and I didn't get any answers there. Sorry for the repost

  2. Terry

    Terry Administrator Staff Member

    Bothell, Washington
    The picture above is not wet vented.

    Wet venting must be fixtures on the same floor and the pipe size is increased one size.

    Neither of these two things are happening here.

    The lower sink must have a vent run to the upper floor, where it can be revented above the shower or tub,

    Or it must have an AAV valve on the trap arm.
    Something like a Studor vent.

    I also do not see that the toilet is vented.

    Fixtures that "are" wet vented would look like the drawing below.

  3. magicalpig

    magicalpig New Member

    Yes, I see what you mean. I think a new vent will be inevitable; and it shouldn't be that hard. I will run the drain straight down and tap into the drain stack below and then pull a new vent through the roof. I wont have to back vent with the upstairs bathroom as shown in my diagram since there is a covered patio with attic behind the sink on the first floor. It will require routing around the window but if I have 6" clearance above the sink flood level I should be okay, right?
  4. hj

    hj Moderator & Master Plumber Staff Member

    Cave Creek, Arizona

    If the vent will exit the patio roof, make sure it is not near any windows for the second floor rooms.
  5. magicalpig

    magicalpig New Member

    I'll be sure to read all relevant code on that, thanks.

    By the way, the kitchen sink, before I moved it, was already vented through this shower drain. It was just positioned on the other side of the drain! I hardly lived in the house 2 weeks before gutting the entire kitchen, so I never got to know any of the problems from this bad venting method.

    What I also find interesting is that I've had 2 plumbers come by to look at this sink situation, and although they each had different ideas and each at least acknowledged the existence of such a thing as "Code", neither one said I'd have to vent the sink through the roof, use an AAV, or tie-in to the shower's vent above all fixtures.
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