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I am going from a flex-duct HVAC system to an all-metal duct system. What is the best way to insulate the ductwork?

by LiveModern Webmaster last modified Jan 04, 2012 02:08 AM
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by last modified Oct 10, 2010

I am replacing the HVAC duct system in my attic. Going from duct-board/flexduct to an all-metal duct system. My question is -- I don't want to insulate the new system with fiberglass. My HVAC guy says he can glue reflective bubble wrap directly to the metal and tape all seams, rather than use fiberglass. Is this a good option? Are there better options for insulating ductwork? I have heard of using cotton fiber as regular insulation, but I haven't read about it being used as duct in



Bubble wrap may help prevent condensation but will help with heat loss/gain. Most bubble wrap products have a R-value around 1. You really want a product with an R-value of 8 in GA. I would recommend foil-faced duct insulation.

More importantly, prior to insulating, I would make sure all joints are sealed well with mastic and have the ducts checked for leakage with a duct blaster test. The duct sealing is where you will get the added benefit of improved indoor air quality.




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