Matt Risinger, Founder of The Build Show, sits down with architect Steve Baczek and Author/Builder Mark Wille for a preview of the Build Science 501 series, covering building science concepts for builders, architects, and homeowners. They explain double wall construction and its role in thermal bridging, exterior insulation, and framing practicality in cold climates. The conversation moves to vapor control layers, why water and air control come before vapor concerns, and how that approach reduces mold risk. They also discuss air tightness, blower door testing, and why more insulation alone doesn’t make a better wall, using coolers and windows as comparisons, along with common mistakes in northern homes.

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