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Thread: A real puzzle - how to connect shower and sink drains with so little room

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    DIY Junior Member dtraster's Avatar
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    Default A real puzzle - how to connect shower and sink drains with so little room

    I probably posted to the wrong thread... I posted it in the remodel forum instead of here. It has the same title as this post. I have a problem connecting a sink and shower drain in my bathroom. Any advice would be appreciated. Thanks.

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    Moderator & Master Plumber hj's Avatar
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    Not a lot of information to give an answer. WHAT is your problem, and the answer would probably depend on WHERE the sink and shower are located relative to each other, and where is the drain?
    Licensed residential and commercial plumber

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    Test, Don't Guess! cacher_chick's Avatar
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    Post some pictures or drawings of how the fixtures and existing plumbing is so that we have some idea of what you are dealing with.

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    DIY Junior Member dtraster's Avatar
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    Sorry about that. I posted this in the remodeling forum.

    First, I bought this house in February of 2012, so none of this is my doing!!
    With that clarified, I have two problems (that Iím aware of) at this point. Iíll start by stating the problems and then provide details. First, I donít really want to have to cut the notch in the concrete basement wall another 6Ē deeper to accommodate a double wye, but thatís doable. The bigger problem is how to connect the drain lines from the shower and the lavatory into the drain and comply with the 2006 international code.

    Iím completely redoing the main guest bathroom in the house. There is a master bath, a half bath upstairs, and another half bath in the basement. The photos and diagrams show the main guest bathroom.
    Previous set up. The toilet was against the wall. It drained into 3Ē ABS and then into a 4Ē cast iron sanitary tee at the top of the basement wall. The person (notice I didnít say ďplumber.Ē) who installed it cut through floor joists and generally botched it up.

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    The only support for the floor under the toilet was two pieces of plywood screwed into the header. The toilet had a very slow leak that had evidently been going on for quite a while because the screws were badly corroded.
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    I have notched the concrete wall so that the lower sanitary tee is exposed and will be removed.

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    I had planned to use a double sanitary tee but the toilet is against the wall so I canít get 18Ē of developed
    pipe length between the closet elbow and a double sanitary tee as required by the code and I canít move
    the toilet to the other side of the room.

    But I can use a double wye with 45-degree ells. This leaves the elevation of the existing
    line from the half bath alone but will drop the inlet from the main guest bathroom about 9-10Ē. In order
    to accommodate the double wye, Iím going to have to cut the notch in the concrete another 6Ē deeper
    but at that location, the wall is thickerÖ 9Ē everywhere else but thereís a pilaster poured in the wall on
    the crawlspace side at that point. That's a problem but not insurmountable.

    Here's the main problem: I need to connect the drain from the shower and from the lavatory into this drain. I can't reduce the the size of the double wye to 3" because of the 4" line coming from the half bath.
    So I donít have room for a sanitary tee between the 45-degree ell and the closet bend. I donít have
    room for a wye on top of the double wye or between the double wye and the closet bend. I could put it
    below the double wye, but that means breaking out even more concrete. So I donít think any of these
    three options work.

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    The code allows quarter bends with side inlets, so I could use a closet bend with a side inlet but I
    understand that they are not acceptable in some jurisdictions, which leads me to believe that may not be
    the best answer Ė although at this point Iím not sure what choice I have.
    Any suggestions would be deeply appreciated. At this point, the only option I can see is to cut the notch deeper and put a wye for the shower and sink below the double wye. :-(

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    DIY Junior Member dtraster's Avatar
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    Having put this together, I think my options are to check to make sure that I can't find a fitting that fits on top of the double wye for the sink and the shower... I'm concerned that there won't be enough fall from across the bathroom where the sink will be. And, assuming that there's not enough room, then I'll just have to make the notch deeper...

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    Forum Admin, Expert Plumber Terry's Avatar
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    Here is a nice link to Bert Polk's plumbing tips

    The new toilets don't work well with double fixture fittings. Not at all with double santees.
    They flush with much more velocity than before, skipping over the fitting and pushing water up the other arm.

    On your previous layout, someone installed a santee on it's side to pick up a lav and shower. That should have been a 3x2 wye fitting.
    The lav and shower will need vents.

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    DIY Junior Member dtraster's Avatar
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    :-) You're a master of understatment!!! As you can tell, the sanitary tee on its side wasn't the only problem.

    You say "The new toilets don't work well with double fixture fittings"... So is the double wye a problem even though it's permitted? I want to do this right!!

    The plumbing tips are really helpful. Thanks.

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