Advice on extending shower drain

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by michaelk, Oct 16, 2012.

  1. michaelk

    michaelk New Member

    Joined:
    Oct 16, 2012
    Location:
    Minnesota
    I'm in the process of moving a shower drain in a concrete basement floor to line up with a new shower enclosure (old was rectangular, new will be corner).

    I've uncovered the p-trap and discovered that it was cast iron, but upon some more concrete smashing, that they used what look like the Fernco connectors I see in the stores today.

    I'm wondering if it's advisable to just disconnect the current p-trap, and connect up the new PVC extension/trap to get it to line up with the new shower drain location? Or will I need to dig back a bit further to replace the connector with something that will fit the OD of the PVC?

    Here's some pictures, hopefully they explain better than the words above. The first is where I'd like the new drain location to be. My plan would be to put a single elbow (I'm hoping 45deg will be all that's needed) and move the trap to the left as shown.

    IMG_2372.jpg

    Here's a picture of the existing cast iron trap with connector. Note the PVC end is 1.5" and appears to just be friction fit into the cast iron trap.

    IMG_2374.jpg

    Thanks in advance for any/all help!
    mike
     
  2. bluebinky

    bluebinky Member

    Joined:
    Aug 31, 2011
    Occupation:
    Software Engineer
    Location:
    Santa Clara, CA
    How far is it from the trap to the vent?
     
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  4. michaelk

    michaelk New Member

    Joined:
    Oct 16, 2012
    Location:
    Minnesota
    There are two vents in the vicinity, the closest is ~32" away (straight distance, I've no idea how far following the pipe). The other is near the toilet/sink and is ~7 feet away (again, straight).

    IMG_2379.jpg
     
  5. cacher_chick

    cacher_chick Test, Don't Guess!

    Joined:
    Jan 5, 2008
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    Test, Don't Guess!
    Location:
    Land of Cheese
    You can use the proper banded coupling to transition directly from C.I. or galvanized pipe to schedule 40 PVC. Code requires a shower drain line to be 2", and the trap to vent distance cannot exceed the maximum allowed by your plumbing code.
     
  6. michaelk

    michaelk New Member

    Joined:
    Oct 16, 2012
    Location:
    Minnesota
    How far does the drain line need to be 2"? If the CI isn't 2", would I be required to replace it all the way back to the trunk? Or can I put a fitting on that transitions from 2" PVC to whatever the CI diameter is?

    Regarding the "trap to vent distance", short of breaking up the concrete all around the pipes to see, how would I know if adding ~12" of pipe would end up exceeding the maximum allowed?

    mike
     
  7. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    The picture appears to show a 2" drain with No-Hub couplings, NOT Ferncos. Just put your 45, (a street 45 into a NoHub coupling might be the best), on the pipe and run to the shower. The trap will rotate to line up with the new location once you get the trap in the area.
     
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