Basement rough plumb - what's this?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by prashster, Sep 19, 2006.

  1. prashster

    prashster New Member

    Messages:
    941
    A guy on JB's forum had this pic of his basement bath rough in. Anyone know what the yellow arrow's pointing to?

    Attached Files:

  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,032
    Location:
    Cave Creek, Arizona
    thing

    It is the "blockout" box for the tub or shower "P" trap.
  3. prashster

    prashster New Member

    Messages:
    941
    Thanks, HJ. Knew you'd be here ;)
    Why is that required? Why can't you just cement the ptrap in like everything else?
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    At the slab-pour stage, you have no way to accurately detemine the exact final placement of the trap....your rough sill plates and walls are not even set at that time. The final location of the trap can be set inside this box once your rough framing is up.
  5. prashster

    prashster New Member

    Messages:
    941
    Thanks Jimbo!
  6. v1rtu0s1ty

    v1rtu0s1ty DIY Senior Member

    Messages:
    176
    Location:
    Chicago IL
    Thanks phrashter for posting the pic here. Am now a member of terrylove too. :D

    By the way, I'm a visual type of person. What is a P trap?
  7. v1rtu0s1ty

    v1rtu0s1ty DIY Senior Member

    Messages:
    176
    Location:
    Chicago IL
    I did a google image search and saw those P-traps :D

    From what I'm currently seeing in my basement, I have to make a big square cut on that black plastic. Am I correct?
  8. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,032
    Location:
    Cave Creek, Arizona
    thing

    First you have to understand that most of the lower portion of a tub drain is below the floor so that big box gives you room for it. It also may give you room to cut the trap off and repipe a new trap if it has to move to a different, nearby, location to line up with the bathtub.
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