Columbia County, FL Hurricane Preparedness: Roof Standards (2026)
Key Facts
- Dividing line
- Centerline of CR 240
- Risk category I
- 105 mph north / 110 mph south
- Risk category II
- 115 mph north / 120 mph south
- Risk category III/IV
- 120 mph north / 130 mph south
- Governing standard
- Florida Building Code + ASCE 7
Summary
Columbia County has adopted its own designated wind zone map under the Florida Building Code and ASCE 7, setting different design wind speeds north and south of CR 240 that govern roof and structural design for new buildings.
The following wind zone areas are adopted as required by the Florida Building Code, and specified by the Florida Building Code and ASCE7, to-wit: (1)Risk category I buildings—105 miles per hour, north of centerline of CR 240 (parts of aka Myrtis & Family Road); and 110 miles per hour; south of CR 240 (parts of aka Myrtis & Family Road).(2)Risk category II buildings—115 miles per hour, north of centerline of CR 240 (parts of aka Myrtis & Family Road); and 120 miles per hour, south of CR 240 (parts of aka Myrtis & Family Road).(3)Risk category III and IV buildings—120 miles per hour, north of centerline of CR 240 (parts of aka Myrtis & Family Road); and 130 miles per hour, south of CR 240 (parts of aka Myrtis & Family Road).
Full Breakdown
Sec. 26-36 designates wind zone areas required by the Florida Building Code and specified by ASCE 7, splitting the unincorporated county along the centerline of CR 240 (part of what is also known as Myrtis and Family Road). Risk category I buildings, generally minor storage structures, must be designed for 105 mph north of that line and 110 mph south of it. Risk category II buildings, ordinary residential and commercial construction, must be designed for 115 mph north and 120 mph south. Risk category III and IV buildings, those housing large assemblies or essential facilities like fire stations and hospitals, must be designed for 120 mph north and 130 mph south.
Linear interpolation between these zones is permitted only when performed in accordance with ASCE 7 and certified under seal by a design professional. Because roof uplift and attachment requirements in the Florida Building Code are calculated directly from the applicable design wind speed, this local wind-zone map is the number a Columbia County building permit applicant or contractor must plug into their roof design calculations rather than a county-wide default speed.
Violations & Fines
Constructing or permitting a building using the wrong wind zone design speed for its location and risk category is a code violation enforced through the building permit process under Sec. 26-35 and Sec. 26-37, and is punishable under the general penalty of Sec. 26-39: a fine up to $500.00, up to 60 days in jail, or both.
Frequently Asked Questions
Does Columbia County have one wind speed for the whole county?
What design wind speed applies to an ordinary house?
Can a designer interpolate between the two zones?
Sources & Official References
Other rules in Columbia County
Florida rules heatmap·Compare Columbia County to another location·View the Florida hurricane preparedness overview
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