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Six nails per shingle in high-wind areas, driven in the manufacturer's designated high-wind nail zone. IRC R905.2.6 and IBC 1507.2.6 require asphalt shingles to be fastened per the manufacturer's instructions, and virtually every major manufacturer (GAF, Owens Corning, CertainTeed, Atlas, Malarkey) specifies 6 nails when the basic wind speed exceeds 110-120 mph (varies by manufacturer and shingle line), on slopes over 60 percent (about 21:12), or when required for the enhanced wind warranty. Four nails is only permitted on standard installations below those thresholds. A few things that will bite you on inspection or a warranty claim: - Nails must hit the common bond/nail line, not above it. High nailing voids the wind rating. - Use 12 gauge minimum, 3/8 inch head, galvanized or stainless, long enough to penetrate 3/4 inch into the deck or fully through sheathing less than 3/4 inch (IRC R905.2.5). - Starter course and hip/ridge often have their own fastening call-outs in the spec sheet; don't assume the field pattern carries over. - For the enhanced wind warranty (e.g., GAF WindProven, OC's 130 mph coverage), you typically also need the manufacturer's starter, ridge cap, and sometimes leak barrier from the same system. If you tell me the shingle brand and line and the wind zone or exposure category, I'll give you the exact nail count, placement, and any accessory requirements from that manufacturer's spec.
