Shower Drain Waste Line P-Trap Question

Discussion in 'Shower & Bathtub Forum & Blog' started by wescotthouse, Jul 12, 2009.

  1. wescotthouse

    wescotthouse New Member

    Jul 11, 2009
    The existing shower drain line looks like picture 1.

    Is the vertical pipe portion on the right side legal? Shouldn't the waste line be only horizontal until it hits the vent stack?

    If I'm right, should I redo the pipes to look like picture 2?

    I'm concerned with my solution because the P-trap riser is going to come down quite a bit (~2 feet). In addition, I'm going to have a horizontal pipe midway down the ceiling to the floor. I might hit or accidently run into them!

    Attached Files:

    Last edited: Jul 12, 2009
  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    Are you saying that it's a shower drain?

    No p-trap
    Wrong fittings when it goes from vertical to horizontal
    No vent.

    Are you sure that's not a lav drain with a vent on the next floor?

    Just beyond I see what looks to be a drum trap for a tub.
    Haven't seen one of those in years. decades
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  4. wescotthouse

    wescotthouse New Member

    Jul 11, 2009
    you are absolutely right about the drum trap. yuck.

    Anyway, that is definitely the drain for the shower. The attached image is a from from the bathroom floor above. The shower was added by previous owner who made it from a bathroom closet.

    I discovered an S-trap within the hollow-core concrete subfloor and that is why I am trying to put in a P-trap. (BTW, I ripped out the old shower to put in a new shower.)

    So to clarify, I plan on dropping a riser from the shower drain, adding a PVC P-trap, and connect it the rest of the way with a 2-inch PVC waste pipe to the 2-inch copper pipe with a no-hub connector.

    My question is, should I take the riser all the way down to the level of where the entry point of the vent stack is and add the P-trap to the riser? From there I would take one horizontal PVC pipe (sloped, of course) and connect it to the vent stack with appropriate connectors.

    BTW, I love this site.:D

    Attached Files:

    Last edited: Jul 12, 2009
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