sink drains

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by mlawrence, Dec 6, 2007.

  1. mlawrence

    mlawrence New Member

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    Oct 4, 2007
    I've noticed in a couple of new houses being built that the plumbers don't drain the lavatory through the bottom plate. Instead they add a couple of 45's and bring it out into the living space. Is there a benefit to this???
     

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  2. Herk

    Herk Plumber

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    Oct 28, 2007
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    Plumber
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    S.E. Idaho
    I have no idea why they do it exactly that way. If it's on an outside wall, you cannot drill a full-sized hole through the plate because of the rim joist beneath it.

    Doing it this way uses more fittings than necessary, it seems to me. The method i was taught is to first drill a hole in the plate, then use a sawzall to cut the face of the plate out. That leaves enough room to drop a piece of pipe with a 45 on it into the floor, and the hole in the plate is covered with a steel plate.

    By using my method, there two forty-fives necessary to go horizontally toward a main or to go around the edge of the concrete foundation. By the method shown in your picture, you've already got two forty-fives, you'll need yet another 90 degrees of turn to go horizontal, and from what I guess, on an outside wall you still aren't clearing the concrete foundation so you'd need yet another vertical offset to go around that.
     
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  4. westcoastplumber

    westcoastplumber Plumbing Contractor

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    Nov 30, 2007
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    los angeles
    to bad your plumber didn't install a c/o above that tee and then when you move in and have a stoppage, it won't be a problem to clean that drain.
     
  5. Herk

    Herk Plumber

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    S.E. Idaho
    One more note on that picture - I live in a place where it can go below zero, sometimes for weeks. I would never put water lines in an exterior wall if I could help it. I'm sure it's not a problem in warmer climates.
     
  6. construct30

    construct30 New Member

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    Jun 16, 2007
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    NorthWest PA
    I would say they did it because it was easier that way. They made more work for the drywallers and cabinet men, but it was easier for them. It would take more fire caulk to seal it around the drywall, if I were the drywaller I would cut a big hole for the plumber to deal with. Fire caulk is expensive stuff and the inspectors love it. Does the other pipe go to another sink?
     
  7. Herk

    Herk Plumber

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    I guess that's what you get for the lowest bid. At least it looks neat.
     
  8. Winslow

    Winslow Plumber

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    Hawaii
    Most likely a beam is situated directly underneath the wall. The plumber offset the pipe into the toe kick area of the cabinet to prevent notching the top of the beam.
     
  9. hj

    hj Moderator & Master Plumber Staff Member

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    ?

    Firestop? Why would they use Firestop? Our drywallers probably have never heard of that stuff.
     
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