What is the recommended type of nail for attaching a 4 x 6 sheet of exterior plywood above grade?

The recommended type of nail for attaching a 4 x 6 sheet of exterior plywood above grade is noncorrosive nails. Using noncorrosive nails, such as galvanized or stainless steel, is essential when working with exterior materials because they are resistant to rust and corrosion. Exterior plywood is subject to weather exposure, moisture, and potential temperature fluctuations, which can lead to deterioration over time if noncorrosive fasteners are not used.

While box nails might be suitable for other applications, they do not offer the same level of moisture resistance as noncorrosive nails. Ardox nails, which are designed for specific purposes like fastening thin materials, may not provide the adequate holding strength and durability required for securing heavy sheets of plywood. Thus, noncorrosive nails are the best choice for ensuring the longevity and stability of the installation.