bathtub to shower conversion

Discussion in 'Shower & Bathtub Forum & Blog' started by slapappy, Sep 7, 2013.

  1. slapappy

    slapappy New Member

    Messages:
    5
    Location:
    Chicago
    I'm going to be converting a tub to a shower enclosure. The tub drain line is 1 1/2" copper. I'll be using the Kerdi Shower kit, which is designed for a 2" drain. Any workaround? I have to tear up part of the subfloor anyway to move the drain to the center of the shower base, but where the 1 1/2" drain line ties into the
    3" pipe, the access is very tight. Is the only option to cut the tee out, and replace with a 3 x 3 x 2 tee? I know that keeping the 1 1/2" drain and using a reducer where the shower drain ties in is not the best option, but will it work? I've torn apart many old showers that functioned properly, that had 1 1/2" pipe. And since copper or PVC drain better than galvanized steel, will it be a problem to use 1 1/2"? If I can use 1 1/2", where is the best place to make the transition, right between the trap and the shower drain flange? There's no permit for this job, so an inspection is not the issue. I want it done right, and to not have any callback. But budget is an issue for my customer.
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,130
    Location:
    Bothell, Washington
    For years the 1.5" drain was fine for showers. And that was when shower heads used more than 3 gallons a minute. In Canada it still is code for one shower head.

    In a retrofit, I like to make the move in size between the p-trap and the shower drain.
    Treating it like a funnel into the p-trap.
  3. slapappy

    slapappy New Member

    Messages:
    5
    Location:
    Chicago
    Thanks, Terry. I didn't think it would be a problem, but wanted to make sure. My main business is home remodeling, and while I do quite a bit of plumbing, it's not my full time job. Good to get feedback from a pro!
    John
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,153
    Location:
    New England
    It all depends on your local plumbing inspector...since you're opening things up, he may require you to change things out to 2". Then again, he may not. It would be a pain to move things in 1.5", then the inspector says it has to be 2". Functionally, as long as you don't have a bunch of showerheads, it should work at 1.5". Have you got enough height to convert to 1.5" and get a coupling on? The Kerdi drain is not the deepest, but it's not the shallowest drain out there, either.
  5. johnfrwhipple

    johnfrwhipple Bathroom Design & Build - North Vancouver, B.C.

    Messages:
    4,443
    Location:
    North Vancouver, BC
    Post(s) removed by John Whipple
    Last edited: Mar 18, 2014
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,153
    Location:
    New England
    Schluter does make a metal drain, should that be required for your local codes. [TABLE="class: producttable"]
    [TR]
    [TD="class: table_text_bold"]Stainless Steel[/TD]
    [TD="class: table_text_wbg"]KD2/E/FL[/TD]
    [/TR]
    [/TABLE]
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