Questions on replacing 20yr old flex duct

Old 07-20-15, 11:03 AM
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Questions on replacing 20yr old flex duct

I want to replace the flex duct in my crawl space. What R value should I use? Any particular brand? Foil tape and or mastic? Should I also replace the insulation wrapped around the plenum?
Old 07-20-15, 12:32 PM
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Join Date: Dec 2005
Location: VA
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Foil wrapped R-8. I would use panduit straps. if the duct wrap isn't messed up id leave it.

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