By The Roofing Brief Team. Last reviewed: October 2026.
Standard roofing nail sizes for asphalt shingles run 1 to 2 inches long (2d to 6d in the penny system, per IKO), with a code minimum 12-gauge (0.105-inch) shank and 3/8-inch head; over a 1/2-inch plywood or OSB deck, a 1-1/4-inch nail is the usual size because the nail must pass completely through any deck thinner than 3/4 inch. A roofing nail is a short, large-head fastener, and the International Residential Code sets the floor: IRC R905.2.5 calls for a 12-gauge shank, a 3/8-inch head and galvanized steel, stainless steel, aluminum or copper nails, and R905.2.6 calls for at least four fasteners per strip shingle or more if the shingle manufacturer requires it. Six-nail patterns come from manufacturer instructions, warranty terms and some local codes, not from a wind-speed trigger in the 2021 or 2024 IRC.
What size roofing nails do you need for shingles?
The right roofing nail length is whatever penetrates the roof sheathing by at least 3/4 inch, or fully through decking thinner than that (IRC R905.2.5). ARMA’s nail application bulletin asks for at least 1/8 inch of point showing through a deck under 3/4 inch thick, and Owens Corning’s Duration Series instructions ask for 1/4 inch. For a single layer of asphalt shingles over 1/2-inch plywood or OSB, a 1-1/4-inch nail is the standard choice; thicker decks, second-layer overlays, and hip and ridge caps push the length to 1-1/2 or 1-3/4 inches.
Length is measured from under the head to the tip. Because the nail passes through the shingle layers, the underlayment, and then the deck, the usable penetration is always less than the raw length. IKO’s roofing nail guide pairs typical architectural shingles on 3/8-inch sheathing with 1-inch nails, thicker sheathing with 1-1/4-inch nails, and hip and ridge shingles with nails about 1/2 inch longer than the field nails.
| Situation | Common nail length | Why |
|---|---|---|
| 3-tab shingle, 1/2-inch deck, single layer | 1 to 1-1/4 in | Penetrates deck; 1-1/4 in gives margin |
| Architectural (laminated) shingle, 1/2-inch deck | 1-1/4 in | Thicker shingle needs more length to reach 3/4-inch penetration |
| Deck thicker than 3/4 in (plank or double deck) | 1-1/2 to 1-3/4 in | Must still clear the deck by 3/4 in |
| Overlay (new shingles over one old layer) | 1-1/2 to 2 in | Extra layer of shingle to pass through |
| Ridge cap over hip or ridge | 1-1/2 to 2 in | Doubled or tripled shingle thickness at the ridge |
When the shingle manufacturer specifies a longer nail or deeper penetration than code, follow the manufacturer: IRC R905.1 requires roof coverings to be applied per the manufacturer’s installation instructions. Owens Corning’s Duration Series instructions, for example, also set deck minimums of 3/8-inch plywood or 7/16-inch OSB.
Roofing nail length for 1/2-inch plywood
On a 1/2-inch plywood or OSB deck, the nail must go all the way through the panel, because the deck is thinner than the 3/4-inch penetration the IRC otherwise requires. Subtract the deck and the exit allowance from the nail length to see how much shingle and underlayment each size can pass through.
| Nail length | Minus 1/2-inch deck | Minus exit allowance | Left for shingles and underlayment at the nail line | Source of the allowance |
|---|---|---|---|---|
| 1 in | 1/2 in | 1/8 in (ARMA) | 3/8 in | ARMA nail application bulletin |
| 1-1/4 in | 3/4 in | 1/8 in (ARMA) | 5/8 in | ARMA nail application bulletin |
| 1-1/4 in | 3/4 in | 1/4 in (Owens Corning Duration) | 1/2 in | Owens Corning Duration Series instructions |
| 1-1/2 in | 1 in | 1/4 in (Owens Corning Duration) | 3/4 in | Owens Corning Duration Series instructions |
The decision rule on a 1/2-inch deck: if the nail point does not show at least 1/8 inch below the sheathing (1/4 inch on Owens Corning Duration shingles), step up one size, from 1-1/4 to 1-1/2 inches. Hip and ridge caps double or triple the shingle thickness, which is why IKO suggests nails about 1/2 inch longer there.
What does IRC code require for roofing nail penetration?
IRC Section R905.2.5 (Fasteners) sets the nail rules for asphalt shingles in both the 2021 IRC and the 2024 IRC. Nails must be galvanized steel, stainless steel, aluminum or copper roofing nails complying with ASTM F1667, with a minimum 12-gauge (0.105-inch) shank and a minimum 3/8-inch diameter head, long enough to penetrate through the roofing materials and not less than 3/4 inch into the roof sheathing. Where the sheathing is less than 3/4 inch thick, the code says only that the fastener shall penetrate through the sheathing; it sets no extra projection. Manufacturers can ask for more: Owens Corning’s Duration STORM and Duration FLEX installation instructions call for fasteners to go completely through the deck by a minimum of 1/4 inch, while GAF’s Timberline HDZ instructions say just through plywood decks. The next section, R905.2.6 (Attachment), covers how many fasteners each shingle gets.
These are minimums. Local amendments and the shingle maker’s instructions can both be stricter than the base IRC: ARMA, for example, adds a 1/8-inch exit through thin decks and a rule that no nail head sits closer than 1 inch to either end of a shingle. Check which IRC edition your jurisdiction adopted before quoting section numbers.
- Shank: 12 gauge (0.105 inch) minimum diameter.
- Head: 3/8 inch minimum diameter.
- Penetration: at least 3/4 inch into the sheathing, or fully through thinner decks.
- Material: galvanized steel, stainless steel, aluminum, or copper, complying with ASTM F1667.
- Placement: in the nailing zone printed in the shingle manufacturer’s instructions. This comes from the wrapper, not the IRC text.
How many nails per shingle: 4-nail vs 6-nail
IRC R905.2.6 in the 2021 and 2024 editions requires the number of fasteners in the manufacturer’s approved installation instructions, but not less than four per strip shingle or two per individual shingle. It sets no wind-speed trigger for six nails. Where wind speed does enter the code is the shingle itself: R905.2.4.1 requires shingles tested to ASTM D7158 (or D3161) with a wind classification matched to the site’s design wind speed. The six-nail requirement, when it applies, comes from the manufacturer, the warranty or a local amendment. Because the code defers to the manufacturer’s count, a six-nail requirement in the instructions is still enforceable by the inspector.
Manufacturers set their own triggers. GAF’s Timberline HDZ instructions list a four-nail standard pattern and a six-nail enhanced pattern that they describe as required by some local codes and required for enhanced wind coverage on certain products. Owens Corning’s Duration STORM and Duration FLEX instructions require six fasteners plus four spots of asphalt roof cement per shingle on slopes over 21 inches per foot. Read the wrapper and the limited warranty for the exact shingle being installed.
| Factor | 4-nail | 6-nail |
|---|---|---|
| Where it comes from | IRC R905.2.6 minimum per strip shingle (2021 and 2024) | Manufacturer instructions, warranty terms or local amendments |
| GAF Timberline HDZ example | Standard nailing pattern | Enhanced pattern: required by some local codes and for enhanced wind coverage on certain products, per GAF |
| Warranty | May not satisfy every enhanced wind warranty | Check the limited warranty for the shingle line |
| Extra material cost | Baseline | Roughly 50 percent more nails per square |
If a bid quotes four nails and your site’s design wind speed puts the shingle in a higher ASTM D7158 class under IRC Table R905.2.4.1, ask the contractor which pattern the shingle maker, the warranty and the local code call for. At four nails per strip shingle, six nails is 50 percent more fasteners. Nailing pattern is only one part of wind resistance, and hurricane roof straps tie the roof structure down to the walls below.
Types of roofing nails
Roofing nails differ mainly by shank profile, which controls how hard they resist being pulled back out (withdrawal resistance). The three common profiles are smooth, ring, and screw shank; IKO says one of its tests found ring shank nails had 300 percent more strength than smooth shank, and head diameter is a standard 3/8 inch on most roofing nails (Grip-Rite’s coil nails use a 7/16-inch head). For metal panels and some accessories, roofers reach for self-drilling roofing screws instead of nails.
- Smooth shank: the cheapest and most common. Adequate for standard residential shingle work but the lowest pull-out resistance.
- Ring (annular) shank: rings along the shaft grip the wood fibers and resist backing out (300 percent more strength than smooth shank in an IKO test). The IRC names one ring shank nail, the RSRS-01 (2-3/8 in x 0.113 in), for roof sheathing, not for shingles.
- Screw shank: a spiral shaft that twists in for grip, used on dense hardwood decks, plank roof boards, and some fascia and trim; the IRC shingle rule (R905.2.5) does not require it.
| Nail type | Withdrawal resistance | Best use | Relative cost |
|---|---|---|---|
| Smooth shank | Lowest | Standard asphalt shingles on plywood or OSB | Lowest |
| Ring shank | High | High-wind zones, upgraded wind warranties | Moderate |
| Screw shank | Highest | Hardwood decks, plank decking, trim | Highest |
Roofing nail materials and coatings
IRC R905.2.5 lists four nail materials for asphalt shingles: galvanized steel, stainless steel, aluminum and copper, complying with ASTM F1667. The code says galvanized and does not name a galvanizing process; ARMA notes galvanizing “by various processes” is the typical route to corrosion resistance, and that aluminum nails need no added coating. Grip-Rite’s roofing nail spec sheet sells both electro-galvanized and hot-dipped nails, with the hot-dip coating made to ASTM A153 Class D.
- Galvanized steel: the workhorse for asphalt shingles. Hot-dip galvanizing to ASTM A153 Class D leaves a heavier zinc layer than electro-galvanizing, but the IRC text accepts galvanized steel that complies with ASTM F1667 and does not ban electro-galvanized nails. Check the shingle instructions and any local amendment.
- Stainless steel: for coastal salt air, cedar shakes, and slate where long life matters more than cost.
- Aluminum: light and corrosion resistant, used with aluminum and some metal roofing, but not for pressure-treated wood or where it contacts dissimilar metals.
- Copper: paired with copper roofing, flashing, and slate for matched, long-life assemblies.
Mixing metals invites galvanic corrosion: an aluminum nail through a steel component, or a bare steel nail against copper, corrodes fast. On copper roofs, IRC R905.10.4 calls for copper, brass, bronze or 300-series stainless fasteners unless the maker says otherwise. For details by metal, see which nails to use with each flashing metal.
Common roofing nail sizes at a glance
Roofing nails are sold by length in inches, by penny size, and by shank gauge. The table combines IKO’s penny conversion with Grip-Rite’s published count per pound for its 11-gauge (0.120-inch) roofing nails with a 7/16-inch head.
| Length | Penny size (IKO) | Approx. nails per lb (Grip-Rite) | Typical use |
|---|---|---|---|
| 3/4 in | n/a | 348 | Not long enough to pass shingles plus a 3/8-inch deck; trim and accessories |
| 1 in | 2d | 272 | Architectural shingles over 3/8-inch sheathing (IKO) |
| 1-1/4 in | 3d | 218 | Standard single-layer asphalt shingles over 7/16 to 1/2-inch decks |
| 1-1/2 in | 4d | 186 | Thicker decks, hip and ridge caps |
| 1-3/4 in | 5d | 152 | Overlays and doubled layers |
| 2 in | 6d | 144 | Multi-layer overlays, ridge and hip caps on thick decks |
Roofing nail prices (October 19, 2026)
| Product | Count | Listed price | Per nail | Source |
|---|---|---|---|---|
| Grip Fast 1-1/4 in x 0.120 in electro-galvanized smooth shank coil (Menards) | 7,200 | $41.98 | About $0.006 | Google Shopping, Oct 19, 2026 |
| Metabo HPT 1-1/4 in electro-galvanized coil (Lowe’s) | 7,200 | $49.98 | About $0.007 | Google Shopping, Oct 19, 2026 |
| 1-1/4 in x 0.120 in electro-galvanized ring shank coil (Best Materials) | 7,200 | $59.99 | About $0.008 | Google Shopping, Oct 19, 2026 |
| Grip-Rite 1-3/4 in x 0.120 in galvanized coil (Home Depot) | 7,200 | $49.98 | About $0.007 | Google Shopping, Oct 19, 2026 |
Coil nails for pneumatic guns come in the same lengths; the gun must be set so the head seats flush, not overdriven into the mat or left proud. ARMA’s bulletin says an improperly adjusted pneumatic tool can cause sealing failures, raised tabs, distortions and blow-offs, and it says to remove overdriven or crooked nails and seal the hole with ASTM D4586 roof cement. For coil sizes, collation types and which coils fit which guns, see our guide to collated roofing nails.
Where roofing nails fit in the assembly
Nails are only one fastener in a shingle roof. The starter course, the field shingles, and the ridge cap each have their own nailing pattern, and the deck they bite into is held by a different, larger nail. The nails that hold the deck itself follow the IRC roof deck fastening requirements.
Roof sheathing nail size
Roof sheathing nails are not roofing nails. IRC Table R602.3(1) in the 2021 edition, as published in Seattle’s adoption of IRC Chapter 6, sets these roof rows:
| Panel thickness | Roof sheathing nail | Edge spacing | Field spacing | Source |
|---|---|---|---|---|
| 3/8 to 1/2 in | 8d common (2-1/2 in x 0.131 in) or RSRS-01 ring shank (2-3/8 in x 0.113 in) | 6 in | 6 in | 2021 IRC Table R602.3(1), item 31 |
| 19/32 to 3/4 in | 8d common (2-1/2 in x 0.131 in) or RSRS-01 ring shank (2-3/8 in x 0.113 in) | 6 in | 6 in | 2021 IRC Table R602.3(1), item 32 |
| 7/8 to 1-1/4 in | 10d common (3 in x 0.148 in) or 2-1/2 in x 0.131 in deformed nail | 6 in | 12 in | 2021 IRC Table R602.3(1), item 33 |
A correctly nailed roof starts with a deck nailed per Table R602.3(1), gets a properly fastened starter shingle course at the eaves, runs field shingles with four or six nails on the manufacturer line, and finishes with ridge cap installation that uses longer nails to clear the doubled material. If the fasteners are backing out, the underlying issue is often the deck. Our guide to roof sheathing thickness and condition covers when OSB or plywood needs replacing before you can nail into it reliably. For a broader primer, see our learn about roofing hub, and for how installation choices drive price, our shingle cost breakdown.
Which roofing nail size should you buy?
| If your job is… | Buy | Rule behind it |
|---|---|---|
| One layer of shingles on 3/8-inch sheathing | 1 in, 12 gauge or heavier, 3/8 in head | IKO pairing; must pass through the deck (IRC R905.2.5) |
| One layer of shingles on 7/16 or 1/2-inch plywood or OSB | 1-1/4 in | Point must exit the deck: 1/8 in per ARMA, 1/4 in on OC Duration |
| Deck 3/4 inch or thicker (plank or double deck) | 1-1/2 to 1-3/4 in | 3/4 in penetration into the deck (IRC R905.2.5) |
| Hip and ridge caps | About 1/2 in longer than field nails | IKO guidance for multiple cap layers |
| Copper roof panels | Copper or 300-series stainless | IRC R905.10.4; avoid galvanic corrosion |
| Roof sheathing panels, 3/8 to 3/4 in | 8d common or RSRS-01, 6 in o.c. edges and field | 2021 IRC Table R602.3(1) |
Frequently asked questions
What size roofing nails for shingles?
For a single layer of asphalt shingles over 1/2-inch plywood or OSB, use 1-1/4-inch roofing nails. IRC R905.2.5 requires the nail to penetrate the sheathing at least 3/4 inch, or go through sheathing thinner than that, and ARMA asks for at least 1/8 inch showing through a thin deck. Thicker decks, hip and ridge caps, and overlays call for 1-1/2 to 2-inch nails.
What length roofing nail for 1/2-inch plywood?
Use a 1-1/4-inch nail. A 1/2-inch deck is thinner than 3/4 inch, so IRC R905.2.5 requires the nail to pass through it; ARMA asks for at least 1/8 inch of exit and Owens Corning’s Duration instructions 1/4 inch. A 1-1/4-inch nail leaves 1/2 to 5/8 inch for the shingles and underlayment; if the point does not show below the deck, step up to 1-1/2 inches.
What size nail for roof sheathing?
For 3/8 to 3/4-inch wood structural panel roof sheathing, 2021 IRC Table R602.3(1) calls for 8d common nails (2-1/2 in x 0.131 in) or RSRS-01 ring shank nails (2-3/8 in x 0.113 in) at 6 inches on center at edges and in the field. Panels 7/8 to 1-1/4 inch take 10d common nails at 6 inches on edges and 12 inches in the field.
How many nails per shingle does code require?
IRC R905.2.6 in the 2021 and 2024 editions requires the number of fasteners in the manufacturer’s approved installation instructions, but not less than four per strip shingle or two per individual shingle. The IRC text has no wind-speed trigger for six nails. Six-nail patterns come from manufacturer instructions, enhanced wind warranties and some local codes, so check the wrapper and warranty for the shingle being installed.
What gauge are roofing nails?
Code sets a minimum shank of 12 gauge, which is 0.105 inch in diameter, with a head at least 3/8 inch across (IRC R905.2.5). IKO says roofing nails are sold in 12, 11 and 10 gauge, and Grip-Rite’s roofing nails are 11 gauge (0.120 inch) with a 7/16-inch head. A lower gauge number means a thicker shank.
Are ring shank roofing nails better than smooth shank?
Ring shank nails have rings along the shaft that grip the wood and resist pulling out; IKO says one of its tests found 300 percent more strength than smooth shank. Smooth shank meets IRC R905.2.5 for shingles. At October 19, 2026 listings, a 7,200-count box of 1-1/4-inch ring shank coil nails cost $59.99 against $41.98 to $49.98 for smooth shank.
What material should roofing nails be?
IRC R905.2.5 allows galvanized steel, stainless steel, aluminum, or copper roofing nails complying with ASTM F1667. Galvanized steel is standard for asphalt shingles; hot-dip galvanizing to ASTM A153 Class D leaves a heavier zinc layer than electro-galvanizing. Use stainless in coastal salt air, and match copper or 300-series stainless nails to copper roofing (IRC R905.10.4).
How deep should a roofing nail go?
Under IRC R905.2.5 a roofing nail must penetrate at least 3/4 inch into the roof sheathing, or fully through sheathing thinner than 3/4 inch. Some manufacturers ask for more; Owens Corning’s Duration STORM and Duration FLEX instructions call for at least 1/4 inch through the deck. The head should seat flush with the shingle surface: overdriven nails cut into the mat and underdriven nails leave a gap, and both defects can void a wind warranty.