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how do we insulate ac ductwork on a flat roof? what materials?

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Posted 2013-04-23T02:55:12+0000  by babpeak babpeak

Hello babpeak and thank welcome to the How-to Community.


I'm not sure at what stage of the project you're right now but from my experience you almost always better of ordering pre-insulated ductwork from the HVAC supplier. You’ll have an option of pin welded or double wall.


If this is something that’s already installed, in place, then I would suggest looking into Polyguard products.


Hope this helps,




Posted 2013-04-23T14:47:08+0000  by George_HD_CHI

Thanks, George, but could you dumb it down for me? 


I also need to insulate exterior ductwork located on top of a flat roof. 


The duct work was already installed (previous owner). I need to know what products to use to insulate it. I saw you recommend Polyguard, but I have 3 questions:

  • Which Polyguard product is recommended for exterior residential use?
  • Where can I puchase Polyguard (because apparently, it's not my local Home Depot)?
  • Are there any solutions that I can purchase locally to install myself? 

Thanks. I've asked half a dozen guys at the local HD how to go about doing this to no real end, so if you have any knowledge to impart, I could really use your help! 


Posted 2013-11-18T03:33:33+0000  by jupjup2001
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