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Steam pipe insulation

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Glen_5
Glen_5 Member Posts: 21
in THE MAIN WALL
I have a one-pipe steam system with its original asbestos insulation. I will deal with that in time, however there are several areas where the old insulation has been removed and bare pipe remains. I would like to insulate those sections to prevent early condensation and would like to know the best way to do this. I have seen fiberglass sleeves, fiberglass rolls, mineral wool, etc as possible options. Any feedback appreciated. Thank you.

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  • michael_15
    michael_15 Member Posts: 231
    my opinion

    The easiest and quickest while not sacrificing quality or paying far too much, in my opinion, are pre-formed rigid fiberglass. There are some other materials, but I've had a hard time finding them, whereas you can get the pre-formed reigid fiberglass at any plumbing supply store. You can't use most foam products which aren't safe at steam temperatures.

    They also sell it at Home Depot/Lowes, but it's extra-thin there and not very useful. You'll probably want it at least an inch thick.

    -Michael
  • chuck_6
    chuck_6 Member Posts: 107


    You should get the fiberglass insulation. Don't go to Home Depot or Lowes. Go to a heating supply store. It comes in 3 foot lengths. If you don't know the diameter, put a string around the outside of the pipe and bring it to the heating supply store. Try to get at least 1 inch thick. A lot of the smaller diameter pipe insulation comes in 1/2 wall thickness. You may want to insulate over that.
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