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Old 07-29-10, 03:21 PM   #19
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Hey all,
My company sent me to a HERS Rater (Energy Star) class. We had a discussion about Sealing Products for ducts. The only product better for sealing ducts than the UL181 Aluminum Tape is UL181 Duct Mastic. UL181 Duct Mastic is a peanut butter like substance when you apply it. It hardens in a couple of days to a flexible hard rubbery seal. It sticks to metal, plastic, and wood. It remains affixed after ul181 tape has sweated off or cracked.

You apply it with a paint brush or gloved hand 1/4-3/8 thick. Push it right into the Crevasses. Larger gaps may need some mesh tape for a binder.
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