What can act as a baffle to prevent wind-driven snow or foreign material from entering the attic cavity?

A felt interlay serves as an effective baffle in roofing applications by providing a barrier that helps prevent wind-driven snow and other foreign materials from entering the attic cavity. Its function is rooted in its structural properties; the felt acts as a protective layer that allows for adequate ventilation while blocking potential debris and moisture from infiltrating the space below.

This material is particularly useful in installations where ventilation is crucial for preventing ice dams and other moisture-related issues. By maintaining a controlled environment within the attic, a felt interlay enhances the longevity and efficiency of roofing systems, contributing to overall home integrity.

In contrast, while fiberglass blankets, perlite boards, and wood fiber insulation have their respective roles in insulation and energy efficiency, they do not specifically provide the baffle function necessary for blocking wind-driven elements from the attic. Their primary purposes differ from the protective barrier function of the felt interlay, which is designed with this specific goal in mind.