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 R905.2.5): 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 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
| Spec | What to use |
|---|---|
| Head diameter | 3/8″ (0.375″) minimum |
| Shank | 12-gauge (0.105″) min; 0.120″ common |
| Length | Penetrate 3/4″+ into deck; ~1-1/4″ new single layer |
| Coating | Hot-dipped galvanized (stainless for coastal/cedar) |
| Shank type | Ring-shank for high wind / best hold |
| Standard | ASTM F1667; follow local code + shingle maker |
What to buy
Frequently asked questions
What's the code minimum roofing nail head size?
3/8 inch (0.375″) diameter, on a minimum 12-gauge shank, per IRC and ASTM F1667. The wide head is what keeps shingles from blowing off.
Ring-shank or smooth roofing nails?
Ring-shank holds far better and is favored (often required) in high-wind zones. Smooth is fine in normal wind.
Electro or hot-dipped galvanized?
Hot-dipped for real roofs — electro-galvanized's thin coating corrodes faster. Stainless for coastal or cedar.
What length roofing nail do I need?
Enough to penetrate 3/4″ into the deck (or fully through thinner decking) — usually ~1-1/4″ for a new single layer, longer over multiple layers.