Insulation next to hot water copper pipe

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Boo, Nov 24, 2007.

  1. Boo

    Boo New Member

    Joined:
    May 29, 2007
    Location:
    California
    Just had water heater moved to our garage when our new copper pipes were installed, so we now have pipes running in the wall between the garage and kitchen where there were previously none. During the repiping process, we found water damaged drywall/insulation due to a latent leak in the roof.

    The good news is that we have beautiful new copper pipes throughout and a brand new roof (cha-ching! $$) but I now have a question regarding insulation resting against the hot water pipes.

    We're using R-13 paper-backed fiberglass insulation and are wondering if this can sit right next to the hot water pipe. Or, is there some special material we should be using in addition to the insulation?

    Thanks!!:confused:
     
  2. frenchie

    frenchie Jack of all trades

    Joined:
    Dec 30, 2006
    Occupation:
    Caretaker
    Location:
    Brooklyn, NY and Fire Island, NY
    You're good.

    Even hot water radiator pipes, which are about twice as hot as the hot water that comes out of your tap, have no restrictions about what touches them.

    The restrictions come into it, only once there's combustion involved: flues, chimneys, and such.
     
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  4. Boo

    Boo New Member

    Joined:
    May 29, 2007
    Location:
    California
    Thanks, Frenchie!

    I thought I was being too retentive, but when it comes to possible fire, I don't want to take any chances. I checked Owens Corning's site and the data safety sheet info didn't say anything about restrictions other than lighting (luckily I'm familiar with IC/non-IC from working on the attic recessed lighting!) and direct heat sources - but better safe than sorry.

    Thanks so much for the quick reply! :)
     
  5. Tischman1

    Tischman1 New Member

    Joined:
    Feb 16, 2015
    Location:
    Maryland
    I just removed some insulation from a bathroom (outside wall). It was charred. There is nothing electrical in the area. The only thing that could have caused the insulation to char in there would be the hot water pipe for the baseboard water heating. I see the original post is from 2007 so maybe things (advice) have changed since then?
     

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  6. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    quote; The only thing that could have caused the insulation to char in there would be the hot water pipe for the baseboard water heating.

    Hot water pipes, of any kind, even steam which is much hotter, have NEVER been hot enough to char anything.
     
  7. Tischman1

    Tischman1 New Member

    Joined:
    Feb 16, 2015
    Location:
    Maryland
    What do you think caused the insulation in the pictures I provided to do what it did? There is nothing else in the space to cause the charring. It was totally enclosed until I opened the wall.

    Hmmm....perhaps the tile saw caused it? I used a dry tile saw to cut through some of the grout....I'll bet that's what it was......I didn't think I went all the way through the tile and the backer board.

    Well that's a relief. It appears that the tile saw is probably the cause.

    Thanks for the reply. I feel much better now.
     
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