ALABAMA · JEFFERSON COUNTY
Birmingham Wind Load Requirements
Magic City design wind loads for Jefferson County, Alabama — inland severe-weather and Dixie Alley tornado exposure under ASCE 7-22.
ASCE 7-22 · WIND & EXPOSURE
Inland speeds, tornado-driven design
Birmingham sits inland in Dixie Alley — moderate basic wind speeds, but a serious severe-weather and violent-tornado record shaped its design environment.
105–115 mph Basic Wind
Risk Category II 3-second-gust range across Jefferson County per ASCE 7-22 maps; higher Risk Categories read a higher-speed map.
3-SEC GUSTExposure B (Urban)
Most of metro Birmingham is Exposure B from its built-up, tree-covered terrain. Open or hilltop sites may warrant Exposure C — judgment per ASCE 7 §26.7.
SURFACE ROUGHNESSRidge-and-Valley Terrain
Red Mountain and Shades Mountain create topographic effects; sites near crests may need Kzt > 1.0 per ASCE 7-22 §26.8.
TOPOGRAPHYDixie Alley tornado exposure
Birmingham lies in Dixie Alley, with frequent violent, often long-track tornadoes — most catastrophically the April 27, 2011 Super Outbreak across Jefferson and surrounding counties. ASCE 7-22 Chapter 32 addresses tornado loads qualitatively for applicable Risk Categories; tornado risk informs careful Risk Category and detailing decisions even where basic wind speeds are moderate.
JEFFERSON COUNTY · PERMITTING
What you need to comply
Birmingham wind load compliance pulls from state code, local permitting, and Alabama PE licensure. The official references:
City of Birmingham Permits
Planning, Engineering & Permits Department for projects within city limits.
PERMITSJefferson County Inspections
Inspection Services handles permits for unincorporated Jefferson County.
INSPECTIONSAlabama PE Licensing
State Board of Licensure for PEs & Land Surveyors — PE seals for commercial work.
PE SEALAlabama Building Commission
Statewide administration of the Alabama Building Code (adopts IBC + ASCE 7-22).
STATE CODEALABAMA · NEARBY & STATEWIDE
Explore the region
Birmingham anchors a multi-county metro that shares its inland wind speeds and Dixie Alley risk.
RUN THE NUMBERS
Calculate Birmingham wind loads
Generate ASCE 7-22-compliant pressures for any Jefferson County address — 105–115 mph velocity, Exposure B, Risk Category adjustments, and PE-ready reports.