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In today’s episode of the Best of the Build Show, we revisit an essential lesson in building science with master builder Jake Bruton. If you’re working on a home with a crawl space, an addition, or any elevated structure with air beneath the floor, this episode is a masterclass on air sealing and insulation. Jake takes us underneath the house to show how the air barrier ties into the far wall, demonstrating the details that make the difference between an energy-efficient, comfortable home and one that leaks heat and moisture. From managing transitions between zip sheathing, subfloors, and rim boards to solving challenges with pier foundations and insulation strategies, Jake walks through practical solutions that ensure durability, performance, and build quality. Along the way, he shares smart techniques for protecting insulation, maintaining nailing surfaces, and ensuring a continuous air barrier. Whether you’re a seasoned builder or simply passionate about high-performance construction, this episode highlights why Jake Bruton has been a trusted educator on the Build Show since its early days. His insights into air sealing under a house are as relevant now as when he first shared them, making this a true “best of” moment.