Flagler County, FL Hurricane Preparedness: Roof Standards (2026)

Sec. 3, Ultimate design wind speed, by drawing four named lines across unincorporated Flagler County using road, canal and property-boundary landmarks rather than coordinates. Line C sets 120 MPH for risk category I buildings along a route from the St. Johns County line down Main Line Canal Grade, East Grade, McNabs Crossing, John Campbell Drive and Water Oak Road to Dead Lake and the Volusia County line. Line A sets 130 MPH for risk category II buildings along a similar inland route ending at County Road 305.

Line B sets 140 MPH for risk category III buildings along a route nearer the coast, from US Highway 1N through W Highway 100 and Powerline to State Highway 11. 3(3), a map dated June 2, 2020 kept on file with the clerk of the court. A separate wind-borne debris line runs roughly a mile inland of the Atlantic shoreline down through the Intracoastal Waterway, St. Joe Canal and Ditch 10 to Colbert Lane, Roberts Road, Moody Boulevard and John Anderson Highway to the Volusia line; land west of a county wind speed line is deemed to carry that line's speed unless a Florida-licensed design professional shows otherwise by interpolation.

Because roof covering, sheathing attachment and structural wind-resistance provisions of the Florida Building Code are keyed to the ultimate design wind speed and risk category assigned to a site, a roofing permit application in unincorporated Flagler County must use the wind speed for the specific line the parcel falls within, and coastal parcels inside the wind-borne debris region carry added impact-protection requirements.