Sealing heating/cooling ducts can dramatically improveThe efficiency of a heating distribution system. Unsealed ducts typically leak about 10 to 15 percent ofThe conditioned air flowing throughThe ducts. Leaky ducts can pull unwanted air intoThe conditioned parts of your house and create pressure differentials withinThe house, exacerbating air infiltration and exfltration problems. Mastic is a fibrous adhesive sealant used forThe coating ofThermal insulation on pipes and ducts, and forThe sealing of un-insulated ducts. It may be applied out of a bucket with a putty knife.The buckets are resealable, with a vapor lock seal lid. Mastic is non-toxic, non-flammable, and dries toThe touch in 30 minutes.
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