The nails for roofing felt are special fasteners made to hold underlayment in place before you install shingles. These nails are shorter and wider than regular roofing nails. They come in different styles and sizes based on your roof type. Most roofers use galvanized steel or aluminum nails. The right nail choice keeps your felt layer secure and prevents water damage under your shingles.
What Size Nails Do You Need?
Roofing felt nails are typically 1 to 1.25 inches long. They have large, flat heads that spread the load across the felt. This stops the nail from tearing through the thin material.
The head size matters. A wider head prevents the felt from ripping when wind pushes on your roof. Most felt nails have heads about 0.5 inches across.
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What Materials Work Best?
Galvanized steel nails are the most common choice. They resist rust and corrosion. Aluminum nails also work well and are lighter weight.
Never use regular finish nails for roofing felt. They lack the wide head needed for underlayment. According to industry data, asphalt roofing systems dominate nearly 80% of U.S. residential projects. Proper fastening of felt under these systems is critical for long-term protection.
Stainless steel nails offer top protection but cost more money. For most homes, galvanized steel nails provide good value and durability.
Nail Spacing and Installation Tips
Space nails about 6 to 8 inches apart along the top of each felt strip. Drive nails at a slight angle, not straight down. This helps the felt stay flat and secure.
According to RubyHome (2025), the average U.S. roof size is 2,647 square feet or 26.47 squares. Proper felt installation protects this entire area from moisture damage. Use enough nails, but do not overdrive them. The nail head should sit flush with the felt surface, not punched through.
Check your nails for rust before installation. Damaged or corroded nails can fail early and cause leaks. Store nails in a dry place until you use them.
Common Felt Nail Types
| Nail Type | Length | Head Size | Best For |
|---|---|---|---|
| Galvanized Steel | 1 to 1.25″ | 0.5″ | Most roofing felt |
| Aluminum | 1 to 1.25″ | 0.5″ | Coastal areas |
| Stainless Steel | 1 to 1.25″ | 0.5″ | High durability |
According to RubyHome (2025), roof installation costs range from $4 to $40 per square foot. Quality felt fastening is part of that cost and impacts your roof’s lifespan. According to RubyHome (2025), metal roofing lasts 40 to 80 years and asphalt roofing lasts 20 to 30 years. Proper felt attachment with correct nails helps your roof reach its full lifespan. According to the National Association of Home Builders, the average U.S. roof size is 2,647 square feet. Each square foot depends on strong felt fastening to prevent water intrusion and extend roof life.
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