What is the minimum penetrations depth for nails in concrete roofing tiles when the deck is not thinner than 3/4 inch?

• A. 2/3 inch
• B. 3/4 inch
• C. 1 inch
• D. 1-1/4 inch

Answer: (B)

The idea here is that fasteners must bite into a solid substrate enough to resist wind uplift and hold the tile in place. When the deck thickness is at least 3/4 inch, the nail should penetrate into that deck by at least 3/4 inch. This minimum depth provides sufficient bite to secure the concrete roofing tile without risking too much through-penetration or deck damage. A shallower penetration wouldn’t give enough hold, while deeper penetration is allowed but not required for the minimum standard.