Are hurricane ties required by code?

Yes in wind zones 90 mph+ (most of the US Gulf and Atlantic coasts). The 2018+ IRC requires continuous load path connections in all areas, making hurricane ties essentially universal.

What is the uplift rating of a hurricane tie?

Common ties like the Simpson H2.5A are rated for 540 lbs uplift. Heavier-duty ties like the H10A are rated for 1,330+ lbs. Choose based on your roof load and wind zone.

Hurricane Tie Calculator

Calculate the number of hurricane ties or rafter ties needed for your roof framing.

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Enter Your Measurements

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How to Use This Calculator

1Enter total rafter or truss count.
2Click Calculate — one hurricane tie per rafter end.

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About This Material

Hurricane ties (Simpson H2.5A, H10, or similar) connect rafters/trusses to the top plate, resisting uplift from high winds. Required by code in wind zones above 90 mph.

Installation Tips

•Nail all specified holes with proper 10d or 16d nails.
•Use galvanized or stainless in coastal areas.
•Install on both sides of each rafter for maximum uplift resistance.

Common Mistakes to Avoid

Under-nailing hurricane ties — the rated uplift capacity assumes all holes are nailed.
Only installing on one side of the rafter.
Using wrong connector type — different rafters require different ties.