4" closet bend or 3" street 90?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by remodelbob, Jan 11, 2008.

  1. remodelbob

    remodelbob New Member

    Joined:
    Jun 30, 2005
    Location:
    Washington
    I am trying to install a toilet waste line in a 2x10 joist bay. My horizontal run is pretty long (almost 20' fortunately goes into a dropped ceiling area near the end, so I will have enough slope), so I need to keep the 3" pipe tucked up as high as I can near the toilet. I was planning on using a 3" street 90, but my plumbing reference book keeps mentioning a 4" closet bend.

    When I look at a 4" closet bend it looks like it would do a much better job of moving the waste, but it is also much deeper than the 3" street 90, which means I am not going to be able to meet slope requirements.

    Is the 3" street 90 adequate? or do I need to find an alternate plan?
     
  2. Gary Swart

    Gary Swart In the Trades

    Joined:
    Sep 1, 2004
    Location:
    Yakima WA
    I'm not a pro, but I'm pretty sure the 3" will be fine. Have you planned the vent?
     
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  4. remodelbob

    remodelbob New Member

    Joined:
    Jun 30, 2005
    Location:
    Washington
    yup, breaking off with a 3x3x2 Y.
     
  5. patrick88

    patrick88 Plumber

    Joined:
    Sep 3, 2007
    Occupation:
    plumber
    Location:
    Webster Ma.
    3" is fine for a bathroom. I would use it for that.
     
  6. construct30

    construct30 New Member

    Joined:
    Jun 16, 2007
    Location:
    NorthWest PA
    Straight up or 45 degree or more.

    How do you guys make these darn computers make a degree sign?
     
  7. remodelbob

    remodelbob New Member

    Joined:
    Jun 30, 2005
    Location:
    Washington
    not enough room to go straight up. going 45 degrees.
     
  8. construct30

    construct30 New Member

    Joined:
    Jun 16, 2007
    Location:
    NorthWest PA
    That's OK, I take it you can't make a degree sign either.

    They must type it first then post it?
     
  9. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    bend

    Uses the spigot closet bend. you can cut the riser off at the floor line after the tiling is complete. It will be "shorter" than a 3" street elbow, just be sure to have enough of the spigot below the floor level so the closet collar/flange will slide down to the floor.
     
  10. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Like hj, I also use a closet bend for that reason.
    The local hardware stores carry an ABS 4x3 spigot closet bend that will take a 4" closet flange.
    If I really want to make it tight, I can trim a bit of closet flange hub away to let the flange drop down farther.
     
  11. BAPlumber

    BAPlumber Plumber

    Joined:
    Jul 18, 2007
    Occupation:
    Journeyman Plumber, business owner
    Location:
    Vashon, Washington
    one option would be to use a 45 degree closet flange and a street 45. that would keep you pretty high.
     
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