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Old 12-02-2010, 07:28 PM   #1
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Fiberglass insulation as a heat shield


Has anyone else done this? I did not have a welding blanket and found myself needing to protect wood in the wall cavity while I sweated a copper fitting. I used a piece of fiberglass insulation which charred and gave off an odor but protected everything quite well.

Is this not a good idea?
Are there any harmful fumes given off when fiberglass is exposed to direct flame?

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Old 12-02-2010, 08:34 PM   #2
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Fiberglass insulation as a heat shield


The odor was just the fiberglass melting. Fiberglass is not meant for that use.


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Old 12-02-2010, 10:46 PM   #3
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Fiberglass insulation as a heat shield


Like Dick said, not a good use of fg. Rock wool would work better, but do try to find some "asbestos" type stuff if you are going to do this a lot, or a scrap of sheet rock if it will fit in.
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Old 12-02-2010, 10:56 PM   #4
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Fiberglass insulation as a heat shield


Fiberglass, get minute glass fibers for your lungs at the same time..... I use and old cookie sheet or a dollar store tin pan with household tin foil.

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Old 12-04-2010, 11:15 AM   #5
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Fiberglass insulation as a heat shield


Thanks everyone. Those other things would not work in the area I was working in. I guess I'll bit the bullet and pay 15 bucks for the blanket next time I sweat joints.
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Old 12-04-2010, 12:20 PM   #6
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Fiberglass insulation as a heat shield


Quote:
I did not have a welding blanket and found myself needing to protect wood in the wall cavity while I sweated a copper fitting. I used a piece of fiberglass insulation which charred and gave off an odor but protected everything quite well.
Ayuh,... For sweating/ soldering,.... My 1st choice would be a little piece of tin,... sheet metal,.. aluminum,.. whatever...
'ell,... common tinfoil works Great... 2 or 4 layers if necessary....

For other applications(more welder type, rather than sweating)...
I've got a couple of old leather coats, straight from a dumpster, that stop heat, 'n splatter Perfectly...
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Old 12-04-2010, 05:48 PM   #7
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Fiberglass insulation as a heat shield


Uh-ohhhhhh, I better yank out that FG blanket I put on the fireplace chimney 5 years ago, between the flue pipe and the flat screen tv on the wall, on top of the fireplace.......
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Old 12-06-2010, 06:12 PM   #8
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Fiberglass insulation as a heat shield


I thought about aluminum foil I just didn't think it would provide enough heat transfer protection. I was trying to protect wood studs and PEX pipes in close proximity to my work.

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