Shower Drain Question (Pictures!)

Discussion in 'Shower & Bathtub Forum & Blog' started by wescotthouse, Jul 11, 2009.

  1. wescotthouse

    wescotthouse New Member

    Jul 11, 2009
    I have a 50 year old ranch with hollow-core concrete slab subfloors. One of the previous owners converted a 2 feet deep master bathroom closet into a shower. I tore it out to put in an adequate size shower.

    The original shower drain had an S-trap. I want to put in a P-trap but that's where my problem begins.

    I think the previous owner did that because directly below the drain hole is where the ducts are. By putting in the S-trap inside the hollow-core, the previous owner was able to have the pipe come out of the basement ceiling and miss the ducts.

    If I put the drain riser vertically through the hole where the original S-trap exited, the drain hole would be on the shower curb.

    So my question is, how do I install the drain line?

    I was thinking of maybe having the riser where the original shower drain was, adding an 90 degree ell to it, run a short (10 inches) horizontal line, add a 90 degree ell so I could have a vertical pipe come out of where the original S-trap exited, and finally add the P-trap. Sort of like the waste arm you would use for a dual kitchen sink waste lines.

    According to this poster http://www.askme********.com/plumbing/modifying-drain-line-reach-new-shower-240542.html#post1167361 , he says I can't do it. So what can I do?

    Attached Files:

    Last edited: Jul 11, 2009
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    come through the floor directly into a p-trap, then you should have a vent, then run to the stack. Keep in mind that the trap is what keeps sewer gasses and moldering crud that accumulates in the pipe (which will happen in the horizontal sections.
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  4. wescotthouse

    wescotthouse New Member

    Jul 11, 2009
    i can't come down directly because the ductwork is in the way. :(
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