Roofing Nails: Picking the Right Coil Nail

Picking the right coil roofing nail comes down to five things — length, galvanization, shank, head size, and collation — and getting them right matters as much as the gun. Code sets real minimums (a 3/8″ head, a 12-gauge shank, 3/4″ of deck penetration), and the wrong nail causes blow-offs no matter how well you nail. Here's how to choose.

1. Length: match the nail to the deck and the layers

The governing rule (IRC R905.2.6 — section numbering varies by code edition, so confirm with your local AHJ): the nail must penetrate at least 3/4 inch into the roof deck — or fully through decking thinner than 3/4″.

• New single layer over 1/2″–5/8″ plywood/OSB: ~1-1/4″ is the common choice (1″ can work on thinner decks).
• Tear-off/re-roof over an existing layer, or thicker built-up decks: step up to 1-1/2″–2″ so you still buy 3/4″ of bite.
• Coil roofing nailers typically run 3/4″–1-3/4″, so match the nail to your gun's range. More detail in our roofing nail size guide.

2. Galvanization: electro vs hot-dipped vs stainless

• Electro-galvanized: cheapest, but a thin zinc coating with the least corrosion resistance. Fine indoors/covered; not the honest pick exposed on a roof.
• Hot-dipped galvanized: a thick, rugged zinc coat — the standard for real roofs and what you should default to.
• Stainless steel: the best corrosion resistance, for coastal/salt air, premium long-life roofs, and anywhere cedar or copper is involved.

Fasteners must be galvanized steel, stainless, aluminum, or copper (ASTM F1667) — no bare/bright nails on a roof.

3. Shank: smooth vs ring-shank

Ring-shank wins on holding power, plainly. The rings bite the wood for far better withdrawal (pull-out) resistance than a smooth shank. Smooth nails are adequate in normal wind; in high-wind zones (design wind above ~110 mph) you'll nail 6 per shingle and ring-shank is strongly favored — and often required by local code. If you're anywhere windy, ring-shank is the smart default. (See how many nails per shingle.)

4. Head size: the wide head is the whole point

Code minimum head diameter is 3/8 inch (0.375″), on a minimum 12-gauge (0.105″) shank (IRC / ASTM F1667); common coil roofing nails run a beefier 0.120″ (11-gauge). The National Roofing Contractors Association (NRCA) actually recommends going a step beyond the code minimum — 11-gauge nails with 3/8″–7/16″ heads (code minimum vs. industry recommendation). The reason the head is big: it's what clamps the shingle down. Undersized heads (like finish or trim nails) pull straight through the shingle mat and let it blow off — never substitute a small-head nail on a roof.

5. Collation: match it to your gun

Coil roofing nails are collated two ways: wire-weld (thin wires hold the coil together) and plastic-inserted (a plastic strip). Both feed fine — but your gun is built for one style, so buy the collation your nailer accepts or it'll jam or won't feed. Most coil roofing nailers take 15° wire-coil nails.

Quick spec cheat-sheet

What to buy

Frequently asked questions

Related articles

← All Roofing Nailers guides