Nails used to fasten concrete roofing tiles must penetrate the deck a minimum of how many inches?

When fastening concrete roofing tiles, it is crucial that the nails penetrate the underlying deck sufficiently to ensure a secure attachment that can withstand various weather conditions. The correct answer is based on building code standards and best practices in roofing installation. A penetration of a minimum of 3/4 inch into the deck is effective in providing the necessary grip and holding strength to secure the tiles against potential uplift from wind or other forces.

By ensuring that nails penetrate the deck to this depth, you also help prevent issues like shearing or the nails pulling out over time, which can lead to roofing failures. This depth strikes a balance between ensuring a solid connection and not compromising the integrity of the deck itself.

In contrast, options suggesting deeper penetration, such as 1 inch, 1 1/2 inches, or 2 inches, are generally unnecessary for concrete tiles and could result in damage to the deck or complications with installation, such as misalignment or installing nails too deeply where they could cause structural issues. Therefore, adhering to the standard of 3/4 inch provides both effectiveness and safety in roofing applications.