Tab shingles are a popular type of asphalt roofing shingle made up of individual tabs, each nailed to the roof deck. The nail pattern and fastener schedule are crucial for proper installation and long-term durability. Typically, you’ll find four nails per tab shingle arranged just below the cutouts or slots in the shingle. Nails should be placed about ¾ inch above the cutout, centered horizontally on each tab, and driven straight so the shingle lies flat without damaging the surface. This pattern helps secure the shingle adequately to resist wind uplift and weather damage. A roofing nail usually has a minimum 12-gauge shank and a 3/8-inch diameter head, which holds the shingle firmly without tearing the material. Incorrect nailing, such as too few nails or nailing too low or high, can lead to loose shingles, leaks, or failing warranties. When diagnosing problems, you can safely inspect your roof from a ladder or ground with binoculars to check if the shingles appear lifted or misaligned. Looking for rust on nail heads or missing caps can be a sign of improper fastening.
If you’re unsure about your roof’s nail pattern or suspect fastener issues, it’s best to call a professional roofer for a thorough assessment. They can safely inspect the roof and will check fasteners for proper placement, nail length, and whether the correct number of nails per shingle was used, which affects wind resistance ratings and manufacturer warranties. When speaking with a contractor, ask whether they follow the roofing manufacturer’s fastener schedules, and specifically request details about the nail type and pattern they use. Also, inquire whether they provide any warranty on their installation, not just on the shingles, to ensure you’re covered if improper nailing leads to damage later. Paying attention to these details helps maximize your roof’s lifespan and maintain warranty protection.