Nails used to fasten concrete roofing tiles must penetrate the deck a minimum of how many inches or through the thickness of the deck, whichever is LESS?

Nails used to fasten concrete roofing tiles must penetrate the deck a minimum of how many inches or through the thickness of the deck, whichever is LESS?

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

Answer: (B)

Nail embedment depth into the deck is tied to how well a fastener can resist wind uplift for concrete roofing tiles. The requirement sets a minimum of three-quarters of an inch into the deck, but if the deck isn’t that thick, you simply drive the nail through the deck thickness. This “whichever is less” rule ensures you get enough embedment when the deck is thick enough, while still allowing a through-deck attachment on thinner decks. In typical decks, three-quarters of an inch provides the needed holding power without over-penetrating, which helps avoid splitting or protruding fasteners. So the required minimum is 3/4 inch, with the caveat that if the deck is thinner than that, you go through the deck instead.

Nail embedment depth into the deck is tied to how well a fastener can resist wind uplift for concrete roofing tiles. The requirement sets a minimum of three-quarters of an inch into the deck, but if the deck isn’t that thick, you simply drive the nail through the deck thickness. This “whichever is less” rule ensures you get enough embedment when the deck is thick enough, while still allowing a through-deck attachment on thinner decks. In typical decks, three-quarters of an inch provides the needed holding power without over-penetrating, which helps avoid splitting or protruding fasteners. So the required minimum is 3/4 inch, with the caveat that if the deck is thinner than that, you go through the deck instead.