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Aug 6, 2018 at 20:31 comment added virtualxtc I've been researching this all night as I'm in the middle of a reno which is giving me access to the top side of the ducts that is too close to the ceiling to normally paint. Someone in a forum recommended spray foam over the peel-n-stick stuff as it will completely seal and provides a better R-value, however, I can't figure out how I'd apply it evenly, or get it to form into a shape.
Aug 6, 2018 at 14:53 comment added Ed Beal I agree there is a thin neoprene self adhesive sheet that is amazing at eliminating this problem but it is over 5x the cost of fiberglass duct wrap. The trick is keeping the warm moist air away from the duct, if sealed up with insulation there won't be any moisture to grow mold.
Aug 6, 2018 at 8:36 history answered Lee Sam CC BY-SA 4.0