Attic ventilation has long been treated as a rule of thumb—cut in some vents and call it good. But in today’s high-performance homes, especially in the mixed marine climate of the Pacific Northwest, that approach can create more problems than it solves. In this session, building science expert Mark LaLiberte breaks down when vented attics work, when unvented assemblies make more sense, and how to execute both correctly.
From moisture management and condensation risk to air sealing, insulation strategies, and code considerations, this session moves beyond outdated practices and into measurable performance. Builders will walk away with clear guidance on choosing the right approach for their projects—and the confidence to explain those decisions to homeowners and inspectors alike.
