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Thread: 2" drain lines and 1/2" supply lines in a 2x4 wall

  1. #1

    Default 2" drain lines and 1/2" supply lines in a 2x4 wall

    I am having trouble squeezing everything in!!
    I ran the drain lines horizontally and now I am
    running the supply lines. There is enough room
    if the supply lines are allowed to touch the drain lines.
    Is this ok? The supply lines would be right up against
    the drywall (behind the cabinets so I am not worried
    about someone nailing through them.
    Alexis

  2. #2

    Default

    If the supply lines are right up against the drywall, the condensation on them will eventually rot out the drywall.

    Can you post a photo?

  3. #3
    Moderator & Master Plumber hj's Avatar
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    Default condensation?

    There is no condensation inside the walls because there is no mumidity there.

  4. #4

    Default insulation

    What if I wrap the supply lines with 1/8" foam/foil insulation?
    Will it pass inspection?
    Alexis

  5. #5

    Default

    Quote Originally Posted by hj
    There is no condensation inside the walls because there is no mumidity there.
    I don't think I've ever seen copper pipes that were actually brushing up against the wall, which is my concern. Even if no humidity, it seems a bit odd and might result in noisy pipes.

    I don't know what the codes are. I'm sure others on this forum might know.

  6. #6
    DIY Senior Member OldPete's Avatar
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    Default

    Quote Originally Posted by hj
    There is no condensation inside the walls because there is no mumidity there.

    I was under the impression that if the temperature inside the wall cavity and the temperature of the water inside the pipes is greatly different (which happens often) then you can get condensation on the pipe.

    I might have missed something.

  7. #7
    Retired Defense Industry Engineer jadnashua's Avatar
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    Default

    There is normally very little air movement within a wall, especially if it is built properly. Without air movement, there is a finite amount of moisture. It normally isn't a problem. Now, an open pipe in the basement ceiling, open to the air can drip a bunch.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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