How to get pipe in place?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by hans_idle, Jan 15, 2008.

  1. hans_idle

    hans_idle New Member

    Messages:
    51
    Location:
    Princeton Junction, NJ
    In my bathroom, the 1/2" copper supply line that feeds the 2 sinks goes through about 5 joists that are on 16" centers. The joists are 2x10 or 2x12 (dont recall which). The longest continuous span of copper pipe (no "T" or couple in place) is about 4 feet long. Given that the holes are slightly larger than 1/2" and given that they are about the mid-point of the joist from top to bottom, I have no idea how they threaded 4 ft of copper pipe into the joist. I would think the pipe would have to bend, but it doesn't look like it was bent. Getting through the first hole would require holding the pipe at an angle. Once through the hole, because the pipe is angled, the hole in the second joist would be missed.

    My issue is that I have to move the plumbing lines over. If I wanted to have 4 feet of copper pipe run through the joists, how the heck would I get it into place? Do I need to bend it slightly and then bend it back?

    I guess I could use a number of smaller pieces and connect them all with couples, but that seems like the hard way.

    I'm mystified as to how to do this.

    -Hans
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,318
    Location:
    New England
    Is it soft copper rather than rigid?

    Another option would be to use pex.
  3. hans_idle

    hans_idle New Member

    Messages:
    51
    Location:
    Princeton Junction, NJ
    The copper in place is type "L", so it's rigid.

    I had thought about PEX. I even had a family member say "no one is putting copper in anymore". I don't really know enough about it, and initial searches led me to believe that it might be problematic when using the stuff they sell in the big-box stores versus what the professionals use (parts failing, class-action lawsuits, etc.).

    I'll take a look through the threads here on the board again on PEX.
  4. Herk

    Herk Plumber

    Messages:
    547
    Location:
    S.E. Idaho
    When plumbing a new house, I would often drill holes all the way out through the rim joist for the main lines. Once the pipes were in, the siding was put on the house and, yes, it would be hard to replace with copper.
  5. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,396
    Location:
    Yakima WA
    You're only dealing with 4 feet? I think I'd I just buy a handful of couplers and use small pieces that could be threaded through the holes. I wouldn't want to do a whole house that way, but for no more than 4 feet, it would very little time to sweat 3 or 4 extra joints.
  6. TMB9862

    TMB9862 New Member

    Messages:
    206
    That's how it's usually done. The wall is drilled all the way to the end and the pipes are then slid in. I bet if you look their are extra holes on the studs where their are no pipes. That or the studs were pre-drilled, the pipe slid in, the the studs put in place.
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