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Air sealing behind tub with cavity rigid insulation

Up to 40% of a home's heat loss or gain comes through air leakage. To make matters worse, that same air almost always carries moisture with it that can condense as it cools on its way into or out of the house. Then comes mold, rot — ugliness. These details offer solutions to the most common home air leaks. Only performance testing — usually with a blower door or fog machine — can identify the leaks in your buildings, but acting on this collection will address the lion's share of air leaks in most homes.

Further Resources

Blog: Blower Door Basics

Blog: Pinpointing Leaks With a Fog Machine

Video: Blower-Door-Directed Air Sealing

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