Several years ago, when I first became interested in the benefits of air-sealing, I enrolled in a Building Performance Institute (BPI) training program that taught me the basics. I later learned a lot more while working on a Passive House project, which called for air-sealing to a very high standard (see "Building a Simple Passive House," 8/11). I now consider air-sealing to be a routine part of every remodeling and new-construction project, and I have a good-sized bag of tricks at my disposal that allows me to deal with a wide range of situations. Some builders may worry that aggressive...

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