What is the best material to use as solid roof decking?

Plywood is considered one of the best materials for solid roof decking due to its excellent strength-to-weight ratio, durability, and performance under weight loads. It is made from thin layers of wood veneer that are glued together, providing a sturdy and stable base for roofing systems. Plywood also has good resistance to warping and cracking, making it suitable for various weather conditions. Its versatility allows it to be easily cut and shaped, which is beneficial for fitting around roof structures.

Additionally, plywood can be treated to enhance its resistance to moisture and pests, increasing its longevity as a roofing material. It is widely used and recognized in the construction industry, especially for residential projects, because it can support a variety of roofing materials, such as shingles, tiles, or metal roofs, effectively.

In comparison, while oriented strand board (OSB) is also a commonly used decking material, it may not offer the same level of moisture resistance or long-term durability as plywood. Metal sheets and concrete panels, while suitable for specific applications, are less common for residential roofs due to their weight and cost. These materials may be more appropriate for commercial structures or specific architectural designs rather than traditional residential roofing.