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Thread: Insulating water pipes

  1. #1
    Join Date
    May 2008
    Location
    Peshtigo,WI
    Posts
    761

    Insulating water pipes

    I have some galvanized water lines in my cabin that get condensation on them and then it drips onto the floor. I tried insulating with foam rubber but I can't do the elbows and unions. Would painting these fittings with Plasti-Dip help keep them from sweating? Or does anyone know of something that can be brushed on to help insulate?
    Confidence: The feeling you experience before you fully understand the situation

  2. #2
    Join Date
    Sep 2016
    Location
    Modesto, CA, USA
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    1,896
    Buy some insulation one size bigger for the joints. Miter as needed just for the joints. You can buy pre made elbows etc for about $2.00 each.
    Bill D.

    starts about one minute in

    https://www.youtube.com/watch?v=DU7nh3z9zKk

  3. #3
    Join Date
    Feb 2014
    Location
    Lake Gaston, Henrico, NC
    Posts
    2,863
    The foam pieces are available for elbows. I would think for tee's too, but I've never looked for any. If they aren't available for tee's, they could be made from two elbow covers. Lowes sells it.

    edited to add: I just checked Lowes website, and they do sell them for tee's too.
    Last edited by Tom M King; 11-05-2018 at 10:35 AM.

  4. #4
    Join Date
    Dec 2005
    Location
    Chagrin Falls, OH
    Posts
    4,580
    Cut the foam at a 45 and they’ll make the elbow.

  5. #5
    In our new house, the water is almost 40 ft from the master bathroom. Took for ever to get hot water to the shower. I put foam insulation on the pipes and the hot water gets there is about 2/3 of the old time. Guess heating up the pipes and surrounding air was taking just too much.

  6. #6
    They make some self adhesive foam tape for doing water lines.
    Lee Schierer
    USNA- '71
    Captain USN(Ret)

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  7. #7
    Join Date
    May 2008
    Location
    Peshtigo,WI
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    761
    Quote Originally Posted by Lee Schierer View Post
    They make some self adhesive foam tape for doing water lines.
    This might be a good option, wraps to any shape and as thick as I want.
    Confidence: The feeling you experience before you fully understand the situation

  8. #8
    Join Date
    Feb 2003
    Location
    Lafayette, IN
    Posts
    4,234
    I can tell you this: if your water lines are carrying water that is below the dew point temperature of the air around them, they will sweat. Insulation will stop this if it is perfectly done. If you have even a pinhole in your insulation, water will build up in any gaps between the insulation and the piping it finds.

    How do I know this? I work maintenance in a building with MILES of chilled water piping for cooling the building--the propylene glycol solution in them enters the building at 45ºF. Any exposed pipe sweats almost year-round.
    Jason

    "Don't get stuck on stupid." --Lt. Gen. Russel Honore


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