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

Discussion in 'Remodel Forum & Blog' started by aroccos, Sep 24, 2006.

  1. aroccos

    aroccos New Member

    Messages:
    2
    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. Verdeboy

    Verdeboy In the Trades

    Messages:
    2,051
    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. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,491
    Location:
    Cave Creek, Arizona
    condensation?

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

    aroccos New Member

    Messages:
    2
    insulation

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

    Verdeboy In the Trades

    Messages:
    2,051
    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. OldPete

    OldPete DIY Senior Member

    Messages:
    186
    Location:
    NJ

    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. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,896
    Location:
    New England
    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.
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