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Steve Baczek emphasizes the importance of maintaining a continuous air barrier in building design. Using “Big Red," Steve illustrates how defining the inside from the outside with a clear, uninterrupted line enhances energy efficiency and moisture control. He breaks down the concept of the "red box"—a sealed, insulated core structure—and stresses that all additional elements like porches or decks should attach outside this boundary. The segment mixes on-site visuals and studio diagrams to explain the practical science behind building airtight, durable, and comfortable homes. It's a must-watch for architects and builders alike.