roofing cap nails
Wind Uplift Destroys Roofs. Our Caps Hold Tight.
No Tear-Through. No Leaks. Just Reliable Seals.
One Nail, Two Jobs: Secure Underlayment, Stop Moisture.
Sinsun Factory Direct Roofing Cap Nails - Plastic & Metal Cap Nails Supplier
Sinsun factory offers premium roofing cap nails—plastic cap nails, metal cap nails, and ring shank options for felt underlayment and shingles. Check size chart. Get wholesale pricing today.
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Roofing Cap Nails Factory Direct | Sinsun Plastic & Metal Cap Nails for Underlayment
You already know why roofing cap nails (also called plastic cap nails, cap nails for roofing, or felt cap nails) are necessary for a long-lasting roof system if you've ever seen roofing felt tear around a nail head in a windstorm. These special fasteners have a regular nail shank and a wide plastic or metal cap that spreads pressure across the underlayment. This keeps the fastener from pulling through and ruining the waterproof barrier.
Sinsun roofing cap nails are different because of the materials they use. The caps are made from UV-stabilized polymers that don't crack or break down even after years in the sun. I've seen this happen with cheaper imported caps that become brittle after one season. The shanks are made of high-carbon steel and have a hot-dip galvanized coating that protects them from treated lumber corrosive environment and coastal humidity. The ring shank design on each nail locks into the roof deck, resulting in it more difficult to pull out than smooth shank nails.
Here's the part that matters to roofing contractors: we manufacture these nails in our own factory, so we do everything from drawing the wire to molding the cap to putting them all together. You don't have to pay a middleman's markup. You get the same high quality every time you get the next batch. Sinsun cap nails give you the holding power and weather protection you need for any job. This is whether you're putting down synthetic underlayment on an existing building in Sydney or re-roofing a hundred-year-old home in Toronto.
| Size (Length) | Shank Diameter (Gauge) | Cap Type | Cap Diameter | Shank Type | Coating | Approx. Count per Box |
| 25mm (1") | 2.5mm (12 Ga.) | Plastic Round | 25mm (1") | Ring | Hot-Dip Galvanized | 5,000 |
| 32mm (1-1/4") | 2.5mm (12 Ga.) | Plastic Round | 25mm (1") | Ring | Hot-Dip Galvanized | 4,200 |
| 38mm (1-1/2") | 2.5mm (12 Ga.) | Plastic Round | 25mm (1") | Ring | Hot-Dip Galvanized | 3,800 |
| 45mm (1-3/4") | 2.8mm (11 Ga.) | Plastic Round | 25mm (1") | Ring | Hot-Dip Galvanized | 3,200 |
| 50mm (2") | 2.8mm (11 Ga.) | Plastic Round | 25mm (1") | Ring | Hot-Dip Galvanized | 2,800 |
| 32mm (1-1/4") | 2.5mm (12 Ga.) | Metal Round | 25mm (1") | Ring | Electro-Galvanized | 5,000 |
| 38mm (1-1/2") | 2.5mm (12 Ga.) | Metal Round | 25mm (1") | Ring | Electro-Galvanized | 4,200 |
| 50mm (2") | 2.8mm (11 Ga.) | Metal Round | 25mm (1") | Ring | Electro-Galvanized | 3,500 |
| 64mm (2-1/2") | 3.0mm (10 Ga.) | Metal Round | 25mm (1") | Ring | Hot-Dip Galvanized | 2,400 |
| 75mm (3") | 3.3mm (9 Ga.) | Metal Round | 25mm (1") | Ring | Hot-Dip Galvanized | 1,800 |
Technical Parameters:
Wire Material:High-carbon steel (C72 grade) for consistent hardness and shank integrity.
Cap Material:UV-stabilized polypropylene (plastic caps) or galvanized steel (metal caps).
Shank Type:Ring shank with 7-9 annular rings per inch for maximum withdrawal resistance.
Point Type:Diamond point for clean penetration through underlayment and into decking.
Coating:Hot-dip galvanized (HDG) for exterior and treated lumber applications; electro-galvanized (EG) for interior or protected applications.
Compatibility:Designed for use with standard roofing nailers and coil cap nailers.
Main Uses of Sinsun Roofing Cap Nails
1. Put on roofing shingles and underlayment
Sinsun felt cap nails and roofing felt cap nails are made for holding roofing shingles and underlayment to roof decks. The protective cap covers the nail hole, keeping water from getting in and protecting the roof deck from moisture damage. These nails are simple to put on, even on sloped roofs, and their sharp tip can cut through fabric and wood decks without ripping them. These nails ensure your roofing system has a tight, waterproof base, whether you're building your roof or replacing an old one.
Get A Quick Qoute2. Installing asphalt shingles and Ridge Caps
Our roofing cap nails are suitable for putting on ridge cap shingles and asphalt shingles. These are two critical parts of a home's roof. The cap, which is made of plastic or metal, seals water from getting in through nail holes and leaking. Button cap roofing nails are suitable for putting on ridge caps because their rounded caps give the job a clean, finished look. They make sure they stay in place. These nails work perfectly with all kinds of asphalt shingles, including organic and fiberglass ones.
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3. Securing the metal roof and underlayment
Plastic caps/nails under a metal roof are the most effective way to hold down the underlayment under the metal roofing. The sharp nail penetrates through the roof deck easily, and the plastic cap keeps the metal roof from scratching the underlayment and keeps it waterproof. Metal cap nails hold metal roofing panels in place. This makes them stronger and better able to withstand strong winds and adverse weather. Metal roofing projects in businesses and factories require these nails.
Get A Quick Qoute4. Removing roofs in homes and businesses
When it comes to roof repair and maintenance, Sinsun roofing cap nails are indispensable.They are effective for fixing loose nails, holding down loose roofing felt, or strengthening ridge caps as well. The waterproof cap ensures repairs last, stops leaks again, and helps the roof last longer. Contractors often keep these nails on hand for quick fixes. This is because they can be used with many different roofing materials, are easy to install, and are useful in many situations. The small repairs they can performare also cost-effective, which is why DIYers and professionals use them.
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Carlos Herrera is a general contractor in Santiago, Chile.
"We work by the coast, where salt air eats through regular galvanized nails in just a few months." The hot-dip galvanized cap nails from Sinsun last a long time. I've looked at roofs we put up three years ago, and there are no rust streaks or damage to the caps. The diamond point goes right through synthetic underlayment without ripping. A good product from a factory that knows how to make roofs.
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Declan Murphy is a roofing contractor in Dublin, Ireland.
"Irish weather is hard on roofs." There is wind, rain, and humidity all year long. Two years ago, I switched to Sinsun plastic cap nails because a supplier let me down by sending me cheap caps that broke in the cold. These stay. The ring shank digs into the OSB, and the caps stay flexible even when it's cold. No callbacks since the change. That's a real sense of peace.
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Marco van der Berg is a building envelope specialist from Rotterdam, Netherlands.
"We make high-performance building envelopes for businesses. The underlayment must stay flat and sealed. We always use Sinsun's metal cap nails with hot-dip galvanizing. The square cap keeps the spacing even, and the ring shank meets the withdrawal resistance standards that our engineers need. "Prices that are competitive for a product that works this well."
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Q: How many plastic cap nails do I need for each square of underlayment?
A: To install standard underlayment, you usually need about 350 to 400 cap nails per square (100 square feet) if you space them 12 inches apart in the field and 6 inches apart on overlaps. For specific spacing needs, talk to the company that made your underlayment.
02
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Q: Is it okay to use plastic cap nails for the underlayment of metal roofing?
A: Yes, plastic cap nails are often used for installing metal roofing underlayment. When metal caps touch metal roofing panels, galvanic corrosion can happen. The plastic cap stops this from happening. Most metal roofing systems can use Sinsun plastic cap nails.
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Q: What's the difference between nails with plastic caps and nails with metal caps？
A: Plastic caps are light, cheap, and great for regular underlayment jobs. Metal caps are better at withstanding tearing and UV rays, which is why they are better for high-wind areas, commercial projects, and applications that are exposed, like ridge caps.
04
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Q: Do I need a special nail gun to use plastic cap roofing nails?
A: Yes, you need a cap nailer or coil roofing nailer with a cap attachment to use plastic and metal cap nails. These tools feed both the nail and the cap at the same time, making sure they are lined up correctly and driving at the same depth every time. Sinsun cap nails are grouped together so that they will work with most standard cap nailers.
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Q: Will plastic cap nails break when it's cold?
A: Cheap plastic caps can break easily when it's very cold. Sinsun uses UV-stabilized polypropylene compounds that stay flexible even when it's cold, which lowers the risk of cracking during installation. Some contractors like metal cap nails better for very cold places because they last longer.
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Q: How long should the cap nail be for my roofing job?
A: Nails that are 1 inch to 1.25 inches long are enough for single-layer underlayment over plywood or OSB. If you need thicker underlayment, insulation board, or more than one layer, use nails that are 1.5 to 2.5 inches long. The nail needs to go at least 3/4 inch into solid wood decking.
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Q: Do building codes require ring shank cap nails?
A: In areas with high winds (over 110 mph), many building codes say that ring shank nails must be used to attach roof underlayment. Ring shank nails are better at holding things in place than smooth shank nails, even when they aren't required.
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Q: If I take off cap nails during a repair, can I use them again?
A: No, you shouldn't use cap nails again. When you take off the ring, the shank could get damaged, and the cap could crack or lose its ability to seal. To make sure the repairs work properly, always use new fasteners.
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