1 Inch Coil Roofing Nails

1 inch is the shortest standard coil roofing nail. It exists for one reason: thin sheathing. On a 1/2" deck, a 1-1/4" nail will exit the underside of the plywood, which is a no-go for both inspection and weatherproofing.

The other use case is cap sheet and modified bitumen, where you're nailing through asphalt-saturated felt onto a substrate that's already several layers thick.

This is the most common mistake we see. Asphalt 3-tab and architectural shingles over standard 5/8" sheathing call for 1-1/4" coil nails — the shingle manufacturer's spec assumes that length for warranty purposes.

Using 1" on standard shingles voids most shingle warranties.

For inland work, hot-dipped galvanized is the daily-driver coating. For coastal cap sheet or any salt-air exposure, switch to 304 or 316 stainless — galvanized streaks rust within months at the coast. Ring shank adds roughly 40% pull-out for high-wind thin-deck work.