On a Kitty Hawk re-roof last month, we used SBS‑modified architectural shingles for better cold flex and tear resistance (ASTM D7158 Class H), a true 6‑nail pattern with 1‑1/4" ring‑shanks into 5/8" OSB, and cap‑nailed synthetic underlayment 6" o.c. — zero blow-offs after a 60+ mph squall. I’ve condensed the steps and material specs into a one‑pager; if you see a tighter approach for coastal installs — especially on ridge caps and starter placement — tell me and I’ll update the resource.