If someone's replacing your roof in Charlotte, there's one detail that matters more than almost anything else — and you'd never think to ask about it. How are the shingles attached to the deck? Nails or staples? The answer affects how long your roof lasts, whether your warranty is valid, and how your roof performs in the 60 mph wind gusts Charlotte sees during summer storms.
Here's the short version: nails are the standard. Staples shouldn't be anywhere near a new roof in 2026. But if you own a house built in the 1980s or 1990s, there's a decent chance staples are already up there holding your current shingles on — and that matters when it's time for a roof replacement in Charlotte.
A Quick History of Staples in Roofing
Roofing staples were everywhere from the mid-1970s through the late 1990s. Pneumatic staple guns were faster and cheaper to operate than nail guns, and crews could fly through a roof in less time. In the subdivisions that were popping up across south Charlotte, Matthews, and Mint Hill during the housing booms of the 80s and 90s, speed was the priority. Builders wanted roofs done fast, and staples delivered.
The problem? Staples don't hold. Not well enough, anyway. A staple has two thin prongs driven into the wood deck, and they sit across a narrow crown — roughly 1 inch wide. Compare that to a roofing nail, which has a single thick shaft and a flat head about 3/8 inch in diameter. The nail head presses down on the shingle evenly. The staple crown presses down on a tiny strip, and under wind uplift, the shingle can pull right over it.
By the early 2000s, the roofing industry had caught on. Manufacturer after manufacturer updated their installation specs to require nails. Building codes followed. Today, you won't find a major shingle brand that approves staple installation, and Mecklenburg County code requires nails on all new roof installations.
What Mecklenburg County Building Code Actually Says
North Carolina has adopted the International Building Code (IBC) and International Residential Code (IRC), both of which specify nails as the required fastener for asphalt shingles. Mecklenburg County enforces these codes through its permitting and inspection process.
When you pull a roof permit in Charlotte (and yes, permits are required for full replacements), the county inspector will check fastener type during the final inspection. If they find staples, the job won't pass. It's that simple. Any contractor who tells you staples are "just as good" or "still code-compliant" is either uninformed or lying to you. Neither is a good sign.
This applies to the entire Charlotte metro area — Indian Trail, Huntersville, Cornelius, Fort Mill, and every other municipality in the region follows the same base code requirements for roof fastening. If you're hiring roofing companies in Charlotte, make sure nails are in the contract.
What Shingle Manufacturers Require
This is where it gets expensive if your contractor gets it wrong. Every major shingle manufacturer — GAF, Owens Corning, CertainTeed, Tamko, Atlas, IKO — publishes installation instructions that specify nails. Not staples. Nails. And here's the kicker: if the shingles aren't installed according to the manufacturer's specs, the warranty is void.
That $2,500 GAF Golden Pledge warranty or that Owens Corning Platinum Protection warranty? Gone. If a claim comes in and the adjuster or inspector finds staples, the manufacturer will deny the claim. They're not being difficult — they tested their products with nails, they rate their products with nails, and they won't stand behind an installation that used something else.
For a deeper breakdown of how installation errors can invalidate your coverage, read our roof warranty coverage guide.
How Staples Fail on a Roof
Staples fail in two main ways, and Charlotte's weather makes both of them worse.
Pull-Through
When wind lifts a shingle tab, it puts upward force on the fastener. A nail's wide, flat head resists that force by pressing down on a larger area of shingle. A staple's narrow crown concentrates the force on a thin line — and the shingle material tears right over it. This is pull-through, and it's the number one failure mode for stapled roofs.
Charlotte sits in a region that regularly sees 50-60 mph wind gusts during summer thunderstorms and the occasional tropical system remnant. Those gusts create serious uplift pressure, especially along roof edges and ridges. Stapled shingles in these zones can peel off in sheets.
Weak Holding Power in the Deck
A staple's two thin legs don't grip the plywood or OSB decking as securely as a single thick nail shaft. Over time, as the deck expands and contracts through Charlotte's hot summers and cool winters, staple legs can loosen in their holes. The shingle isn't being held against the deck anymore — it's just sitting there, waiting for the next storm to lift it.
Older homes where the original OSB decking has softened from 30+ years of heat cycling are especially vulnerable. The staples were barely holding when they were new; decades later, they're doing almost nothing.
Charlotte's Wind Zone Requirements
Mecklenburg County falls within a wind design zone that requires shingles to be rated for a minimum 110 mph wind resistance. To hit that rating, the shingles need to be fastened according to the manufacturer's high-wind installation instructions, which typically call for six nails per shingle instead of the standard four.
This is called the "six-nail pattern" or "high-wind nailing pattern." The two extra nails go on either side of the shingle's nail line, closer to the edges where uplift force is highest. With staples, you can't reliably achieve that uplift resistance no matter how many you use — the crown shape just doesn't distribute force the way a nail head does.
If your roof was installed with four staples per shingle instead of six nails, it's doubly deficient: wrong fastener type and wrong fastener count.
The Right Nail for the Job
Not every nail is a roofing nail. Here's what should be going into your roof:
- Gauge: 11-gauge or 12-gauge. This is the thickness of the nail shaft. 11-gauge is the most common for asphalt shingles — thick enough to hold, thin enough not to split the shingle.
- Head diameter: 3/8 inch minimum. Some manufacturers spec a larger head. The bigger the head, the more shingle surface it presses down on, and the harder it is for wind to pull the shingle over it.
- Length: 1.25 inches minimum for standard installations over a single layer of shingles on plywood or OSB. If the crew is nailing through a layer of old shingles (a reroof over existing), they'll need 1.75-inch or 2-inch nails to penetrate through both layers and anchor in the deck. Read more about reroofing over existing shingles in Charlotte and whether that's even a good idea for your home.
- Material: Galvanized steel or stainless steel. The galvanized coating prevents rust. In Charlotte's humidity, an ungalvanized nail will start corroding within a few years, weakening its grip and staining the shingles around it.
Hand Nailing vs Pneumatic Nail Guns
Most residential roofing crews in Charlotte use pneumatic coil nailers. These are air-powered nail guns loaded with coils of roofing nails. They're fast, consistent, and when set up correctly, they drive each nail to exactly the right depth — flush with the shingle surface, not overdriven into it and not sticking up above it.
The "when set up correctly" part is the issue. If the air pressure is too high, the gun overdrives the nail, punching the head through the shingle surface. That creates a hole that water will find. If the pressure is too low, the nail sticks up and prevents the shingle above from sealing flat. Both problems are common with crews that don't calibrate their guns at the start of each job — or don't recalibrate as the day heats up and air pressure in the compressor changes.
Hand nailing — driving each nail with a hammer — gives the roofer more control over depth. Some high-end contractors hand-nail every shingle. It takes longer and costs more (expect to pay $500 to $1,500 extra on a typical Charlotte home), but it eliminates the overdriving problem entirely. For most homes, a well-calibrated pneumatic gun is perfectly fine. But if you're spending $20,000+ on a premium shingle, asking about hand nailing isn't unreasonable.
How to Check What Your Roofer Used
You can verify fastener type without climbing on the roof. Here's how:
- Check your contract. It should specify "roofing nails" as the fastener type. If it just says "fasteners" without specifying, ask for clarification in writing before work starts.
- Watch during installation. When the crew is working, you can hear the difference. A pneumatic nailer has a sharp, single-impact "thwack." A staple gun has a lighter, faster sound. If you're hearing rapid-fire light impacts, ask what tool they're using.
- Check the attic. After the roof is done, go into the attic with a flashlight. Look at the underside of the deck. Nail tips poking through look like single points. Staple legs look like two parallel points very close together. This is the easiest and most definitive way to check.
- Lift a shingle edge. On warm days, you can gently lift the bottom edge of a shingle along the lower course and see the fastener heads. Nail heads are round. Staple crowns are rectangular. Don't do this in cold weather — the shingles are brittle and will crack.
For a full walkthrough of what to inspect after a roof job, see our post-installation roof checklist.
What If Your Existing Roof Was Stapled?
If your home was built in the 80s or 90s and the original roof is still on it, there's a strong chance it was stapled. Neighborhoods across Charlotte — especially the older subdivisions in Matthews, Mint Hill, and east Charlotte — are full of stapled roofs approaching or past the 30-year mark.
A stapled roof isn't an emergency on its own. Plenty of stapled roofs have lasted 25-30 years without catastrophic failure. But they're more vulnerable to wind damage, and any storm that peels shingles is going to take more of them on a stapled roof than a nailed one.
If you're getting your roof inspected — whether because you're buying a house, selling one, or just curious about its condition — ask the inspector specifically about fastener type. A good inspector will note it in the report. If the roof is stapled and near end of life, plan for replacement rather than repair. There's no practical way to re-nail an existing stapled roof without taking the shingles off and starting over.
The Cost Difference Is Almost Nothing
Here's the irony: the cost difference between staples and nails is negligible. A coil of roofing nails costs slightly more than a coil of staples, but we're talking about $30 to $50 in additional material cost for an entire roof. On a $10,000 to $15,000 roof replacement, that's a rounding error.
No legitimate contractor in the Charlotte market is using staples to save money in 2026. If one is, they're either using ancient equipment they haven't updated, or they're cutting corners on a level that should make you question everything else about their work. For tips on identifying shady contractors, check out our guide on how to spot a bad roofing job in Charlotte.
Nail Placement Matters as Much as Nail Type
Even with the right nails, placement is critical. Every shingle has a "nail line" — a zone printed on the shingle or specified in the manufacturer's instructions where nails should go. This zone is typically about 1 inch above the top of the cutout (on three-tab shingles) or along a marked line on architectural shingles.
Nails placed too high miss the double-thickness overlap zone and only go through one layer of shingle. That shingle has half the holding power and is far more likely to blow off. Nails placed too low can sit in or near the exposure area, where they're visible and exposed to weather.
The correct nail placement puts each nail through two layers of shingle (the top of the lower shingle and the bottom of the upper shingle), maximizing holding power. On a 2,000-square-foot Charlotte home with six nails per shingle, that's roughly 4,800 nails — and every single one of them needs to be in the right spot.
What to Ask Your Contractor Before They Start
Before any work begins on your roof, ask these questions and get answers in writing:
- What fastener type will you use? (The answer should be "galvanized roofing nails.")
- What nail length? (1.25 inches minimum for new installations, longer for reroofs.)
- How many nails per shingle? (Six in Charlotte's wind zone, per manufacturer high-wind specs.)
- Do you hand-nail or use a pneumatic gun? (Either is fine — but ask how they calibrate the gun.)
- Will you pull a permit? (Required in Mecklenburg County. The inspection will verify fastener type.)
Any contractor who hesitates on these questions or gives vague answers isn't someone you want on your roof. This is basic stuff — the roofing equivalent of asking a mechanic if they'll put oil in your engine. It shouldn't be a hard question.
A small detail like fastener type can make or break a roof installation. Nails are the standard for good reason — they hold better, they meet code, they satisfy the manufacturer, and they cost practically the same as the staples they replaced. Don't leave it to chance. Ask before the crew shows up, check after they leave, and make sure the building inspector signs off on the finished product.