Insulating Furnace duct work?
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From: Williamson, NY
Insulating Furnace duct work?
I need to insulate my furnace duct work and I'm looking on opinions as to what type/brand of duct insulation works best and won't break the bank buying the materials. Thanks.
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From: Williamson, NY
My question was not where top buy it, but what to buy. There are many different types of insulation to use on furnace ducts and some are better than others for many different reasons, like R-value, ease of installation, cost, etc. From what I've read so far I have concluded that fiberglass insulation is not the way to go and I'm leaning towards products that have foil on both sides and a polyethylene bubble layer in the middle. There seem to be a few different manufactures of this type of insulation, one of which is called Reflectix. Another question I have is there are different ways these products are applied to the ducts, one is a spiral wrap and another is applied linearly, so I was hoping to get some opinions from people who have used these products and what they liked or disliked about them.
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From: Williamson, NY
I picked up a roll of the Reflectix insulation tonight on the way home from work. The Reflectix insulation is the made the way that suzuki1750 described above. I was planning to use the foil tape to install the material. What type of adhesive did you use? Thanks.
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Are you installing on outside or inside duct? I will have to check the spray on stuff that i used. I dont remember the name off the top of my head. Will check tomorrow. it comes in an erosal can and sprays on . Smells like rubber cement. It is specificaly designed to hold the insulation to the metal.
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From: Williamson, NY
I will be installing the insulation on the outside of the duct work. I am going to try and install some 1/2-3/4" foam spacers on the duct work to create an air gap between the duct and the insulation. The air-gap is supposed to increase the R-value of the installed insulation from ~ 4 to ~6.
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I don't think it's necesarry to adhere the foil facing to the ductwork. If you want an air gap just use adequate spacers and then stretch the material over them and foil tape it up.
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From: Williamson, NY
That's is what I plan to do, I just need to find the appropriate material to use as a spacer.
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