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    Shower Drain Size

    Asked Dec 13, 2006, 07:31 AM 3 Answers
    Hi There. This should be a fairly simple one. I'm putting a standing shower stall in my basement washroom but don't have rough-in for a shower. The rough-in for the toilet and lavatory are there, however. The lavatory drain is 1 1/2" but turns into 2" about 8" above the concrete. Because I am plumbing above the floor for my shower, i have to put the shower on a raised platform. In order to do this and not have a huge step to deal with, I plan on draining my shower with 1 1/2" ABS pipe, so my vertical space requirement under the shower will be much less than if I used 2". The drain pipe will then travel about 8' into the bottom part of the lavatory drain, which is 2" at the junction. I plan on giving the 1 1/2" drain pipe about 1/4" per foot of slope, so the overall slop should be about 2". My vent for this drain will be about 18" from the shower p-trap, between the shower and the lavatory. I have included a drawing which I hope will help visualize the situation (though the view is from the top). Does this sound/look acceptable?
    Hmmm... I can't seem to put the picture in here for some reason... maybe I can email it to someone if this gets looked at..

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    Last edited by PGerard; Dec 13, 2006 at 08:30 AM.
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    speedball1's Avatar
    speedball1 Posts: 29,303, Reputation: 1939
    Eternal Plumber

    Dec 13, 2006, 01:53 PM

    Looks good to me. The only thing I would change is the 90 coming out of the shower. I would use two 45's or a long sweep to do away with the sharp bend. I would also install a cleanout on the shower line for a little insurance.
    Good luck, Tom
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    PGerard's Avatar
    PGerard Posts: 36, Reputation: 1
    Junior Member

    Dec 13, 2006, 04:33 PM
    Quote Originally Posted by speedball1
    Looks good to me. The only thing I would change is the 90 coming out of the shower. I would use two 45's or a long sweep to do away with the sharp bend. I would also install a cleanout on the shower line for a little insurence.
    Good luck, Tom
    Thanks Tom... That's a very good suggestion considering my decision to go with 1 1/2" drain... I struggled with this a bit and you have definitely set my mind at ease. I have only been a member for 2 days but have reviewed many of your answers about plumbing and they have all been excellent... it's a learning experience. Thanks again.
    Trafcon's Avatar
    Trafcon Posts: 2, Reputation: 1
    New Member

    Jan 9, 2008, 10:21 PM
    PGerard, You're probably done by now but a 1 1/2 inch shower is fine especially if you use one of the new lower flow heads. I'm building a shower right now myself.

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