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Thread: Basement shower drain help...

  1. #1
    Homeowner jfls45's Avatar
    Join Date
    Jun 2009
    I live in PA

    Default Basement shower drain help...

    I could use some more advice with installing this p-trap...

    Is there a certain length for the inlet pipe into the p-trap, should it be long enough to hold enough water to push through the trap?

    Is it ok to backfill around this pipe (ABS) with sand?

    How do I get a downward slope with my piping?

    Thanks for the help... see attached pictures
    Attached Images Attached Images   

  2. #2
    Journeyman & Gas Fitter Doherty Plumbing's Avatar
    Join Date
    Jun 2009
    Penticton, BC


    Where are you trying to tie this p-trap into?

    The fixture outlet (the piece going into the trap) usually doesn't have a minimum length because it's really irrelevant. You're amost forced to make it atleast 4" long in most cases.

    If you're trying to tie that p-trap into the existing pipe in the hole in the trench there then you shouldn't do that. You'll be creating yourself a nice little s-trap (the fall exceeds the diameter of the pipe before you hit a vent).

    The trap outlet needs to be at grade with the horizontal drainage in the ground.

    You want to do this:


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