4.10 Attic access panels, drop-down stairs, & whole-house fans equipped with durable ≥ R-10 cover that is gasketed (i.e., not caulked). Fan covers either installed on house side or mechanically operated
The following Solution Center guides provide specific guidance for attic access panels, drop-down stairs, & whole-house fans:
Guide describing how to air seal a whole-house fan system.
Guide describing how to air seal attic access panels, doors, and stairs to provide a continuous air barrier at the ceiling.