Apply IRC fastening requirements for asphalt shingles (minimum fastener count, type, and placement)

Steps

1. Identify the IRC edition adopted by the jurisdiction (editions vary by state/locality) before citing a section number, since numbering has been stable at R905.2.6/R905.2.6.1 in recent editions but content changes between cycles.
2. Confirm baseline fastener count: not less than four fasteners per strip shingle (or two per individual shingle) unless the manufacturer's installation instructions or a higher wind-classification requirement calls for more.
3. Check whether the local wind speed or the shingle's tested wind classification triggers a manufacturer-specified higher fastener count (commonly six nails in high-wind installations) — this overrides the code minimum.
4. Verify fastener spec: corrosion-resistant (galvanized steel, stainless steel, aluminum, or copper) roofing nails, minimum shank/head dimensions per the applicable ASTM fastener standard, long enough to penetrate through the shingle and adequately into the deck.
5. Confirm nail placement is within the manufacturer's designated nailing zone/strip on the shingle — high placement is a leading cause of code and warranty failures even when count is correct.
6. Document that the deck itself meets minimum thickness/fastening requirements, since shingle fastener penetration requirements are tied to sheathing thickness.