The structural foundation between the roof’s support framing and the roofing material is a crucial element in any building’s construction. This layer provides a surface for the attachment of shingles, tiles, or other weather-resistant coverings. Common materials used in its construction include plywood, oriented strand board (OSB), and, in some older structures, solid wood planks.
This essential component significantly impacts the roof’s ability to withstand wind, snow, and other environmental stressors. A properly installed and maintained surface enhances the longevity of the overall roofing system by providing a stable and secure base. Historically, the choice of material depended on availability and regional construction practices, evolving from rough-sawn lumber to engineered wood products offering greater consistency and performance.