my gas furnace sits in the laundry room in the basement and there is a
lot of heat that comes off the pipe the sends the hot air up into the
house. I went to HD and asked about wrapping some form of insulation
around the pipe. I was first told to use batting wrapped in plastic.
Thought this was not going to work given the amount of heat that comes
off the pipe. Of course I wasted money on that after seeing the
batting turn brown and fall off the pipe (had it taped on with heat
resistent tape). Went back and someone else provided me with a foil
wrap that sandwiches bubble wrap - I think it had an R rating of 4.
Went on easily but as soon as the furnace kicked on, the bubble wrap
shrunk and is now just a piece of foil wrapped around the piping. Im
starting to think this isnt meant to be. I have only found stuff
online that talks about insulating the heating ducts but nothing that
provides any info on insulating the actual pipe that comes out of the
top of the furnace. Is there such a thing?
shouldn't get much hotter than 150 degrees F, so there are several
choices of insulation available, like fiberglass.
But if you melted the "bubblewrap" (by the way, that's designed for
radiant barriers, not for what you did with it), I suspect you wrapped
it around the flue (despite your saying it goes "up into the house,"
which the flue had better not). That can get a lot hotter. You should
probably leave it alone.
The e-mail address in our reply-to line is reversed in an attempt to
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post a link to the UL approval.
By code, it cannot be used on interior duct surfaces, Duct wrap yes,
duct liner NO.
I know of a very large duct cleaning company that installs the product
inside airhandlers and RTU's after performing their cleaning services.
Does not meet code in these applications.
I still see alot of insulated flue pipes. Carrier has a mid vented with cvent
to the liner. They put an insulated aluminum jacket around the cvent. I have
started pulling alot of them off since discovering rust and corrosion at the
vent connector. I see alot of cracked cells in carriers now, this is what led
me to find the rotted flue pipe. New installs use bvent now, and even the
latest cvent is no longer insulated. If you want to save money ditch the 80%
and get a high efficiency. Insulating the flue pipe isn't a good idea.
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