Hot water in Cold line/basement rough-in

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by zerolast, Mar 2, 2008.

  1. zerolast

    zerolast New Member

    Joined:
    Mar 2, 2008
    Location:
    Columbus, Ohio
    I had plumbing roughed-in for a full bath down in the basement a few months ago. When I run the kitchen and upstairs bathroom faucets, we get hot water in the cold line for a few moments. I checked the rough-in lines in the basement tonight and the hot and cold water lines going through the new bathroom are both quite hot. I have a shower that is rough-ed in as well. Could this be the mixing point for the hot and cold water? How do I take care of this as I might not want to finish the rough-in for a couple more months. Any advice is appreciated. Thanks, Dave
     
  2. krow

    krow Plumber

    Joined:
    Feb 11, 2008
    Occupation:
    Plumber
    Location:
    Ontario, Canada
    What type of valve do you have roughed-in?
     
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  4. Redwood

    Redwood Master Plumber

    Joined:
    Dec 15, 2007
    Occupation:
    Service Plumber
    Location:
    Connecticut
    I bet a delta without the cartridge installed yet...
     
  5. zerolast

    zerolast New Member

    Joined:
    Mar 2, 2008
    Location:
    Columbus, Ohio
    Yes, it is a delta with just a gray knob where I assume the cartridge will go. Is there a temporary fix without finishing this off?
     
    Last edited: Mar 3, 2008
  6. hj

    hj Moderator & Master Plumber Staff Member

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

    NO. it is designed to pressurize both hot and cold lines in a new situation where the hot water heater is probably not installed, and the two systems may not be connected together any other way.
     
  7. Redwood

    Redwood Master Plumber

    Joined:
    Dec 15, 2007
    Occupation:
    Service Plumber
    Location:
    Connecticut
    Thats some crystal ball huh? There seems to be a rash of these Delta rough in hot/cold cross connections lately. It seems to be a common installer error. You either need to install the cartridge or, put valves in the supply pipes to the Delta valve and turn them off.
     
  8. hj

    hj Moderator & Master Plumber Staff Member

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

    I suppose the idea is that it is either going into a new construction where the crossover is helpful, or a remodel where the trim is usually installed almost immediately. The one thing Delta does not want is for the installer to put it in, turn on the water and assume there is no leak, but not have water pressure on the hot side.
     
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