Final answer:
The minimum nail size for nailing 1/2" O.S.B. board to floor joists is an 8 penny (8d) nail, which is about 2 1/2 inches long, ensuring secure attachment to the joists.
Step-by-step explanation:
When nailing 1/2" O.S.B. board to floor joists, the minimum nail size should be 8 penny (8d) nails for sheathing purposes. These nails are typically at least 2 1/2 inches long, which provides sufficient penetration through the O.S.B. board and into the floor joists to ensure a secure fit.
It is essential to follow local building codes and guidelines, which may have specific requirements for nail size and spacing.
8d Common Nails: These are often used for attaching 1/2" OSB to framing members. An 8d common nail is approximately 2 1/2 inches long.
8d Ring-Shank Nails: Ring-shank nails provide enhanced holding power and are a good choice for securing OSB to floor joists.
Always check local building codes and regulations, as well as the recommendations of the OSB manufacturer, for the specific nail size and type required in your area. Using the correct nails ensures that the OSB is securely fastened and contributes to the overall structural integrity of the floor system.