Check out Episode 8 of Build Science 301! Matt and Steve explore unvented roof assemblies, framed either on-site (cut roof) or off-site (truss), and explain how moisture control shifts away from the structure and onto building systems. With HVAC now inside conditioned space, these assemblies can be efficient—but only if detailed with airtightness and proper insulation ratios. Learn how to avoid condensation risks, why mechanical ventilation is critical, and how to get the balance right in differ
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