TEXAS · 2021 IBC · ASCE 7-16
Texas Wind Load Requirements
From the Gulf Coast windstorm catastrophe area to the inland plains — codes, ASCE 7 edition, TDI / TWIA rules, and design wind ranges in clean visual modules.
CODE & STANDARD
Texas Code & ASCE Edition
Texas operates under the 2021 International Building Code with state amendments, adopting ASCE 7-16 for wind load calculations. Coastal Gulf areas carry enhanced provisions.
Building Code
2021 IBC with Texas amendments.
2021 IBCWind Standard
ASCE 7-16 governs all wind load design statewide.
ASCE 7-16Coastal HVHZ
Within 1 mile of the Gulf — the highest wind speeds and strictest rules.
GULF COASTOversight: TDI
Texas Dept. of Insurance handles product evaluations & coastal enforcement.
TDITexas Wind Load Key Requirements
Building Code: 2021 IBC with Texas amendments · ASCE 7: ASCE 7-16
Coastal HVHZ: within 1 mile of the Gulf Coast (highest wind speeds) · Exposure C required for coastal structures
TDI Product Evaluations: windows, doors, roofing & cladding in coastal areas · WPI-8: mandatory for TWIA coverage
PE Seal: required for commercial structures and coastal residential projects
WIND ZONES
Coastal Windstorm vs Inland
Design wind speeds drop sharply moving from the hurricane-exposed Gulf Coast to the inland plains. Values are 3-second-gust ranges for Risk Category II.
Gulf Coast HVHZ
Within 1 mile of the coast — TDI evaluations, WPI-8 cert, TWIA region. Exposure C.
140–160 MPHCoastal Counties / Houston Metro
1–10 miles inland and the Houston metro with Harris County amendments. Exposure B or C.
120–150 MPHInland: North & West Texas
South Texas plains, North Texas (tornado considerations) and open West Texas terrain.
90–130 MPH| Region | Risk Cat II Velocity | Exposure | Special Requirements |
|---|---|---|---|
| Gulf Coast HVHZ (within 1 mile) | 140–160 mph | C | TDI evaluations, WPI-8 cert, TWIA |
| Coastal Counties (1–10 mi inland) | 130–150 mph | C or B | TDI recommended, enhanced tie-downs |
| Houston Metro | 120–140 mph | B or C | Harris County amendments, flood |
| South Texas Plains | 110–130 mph | B or C | Standard IBC requirements |
| North Texas | 90–115 mph | B | Tornado considerations in some areas |
| West Texas | 90–110 mph | B or C | Open terrain, dust storms |
CITY GUIDES
Major Texas Cities
City-specific wind speeds, codes, and local enforcement — coastal Gulf cities first, then inland metros.
Houston
Gulf Coast metro
130–150 MPHGalveston
Coastal TWIA island
150–160 MPHCorpus Christi
Gulf coastal
140–150 MPHDallas
North Texas
100–115 MPHSan Antonio
Central Texas
100–115 MPHAustin
Central Texas
100–110 MPHFort Worth
North Texas
100–115 MPHArlington
DFW metroplex
100–115 MPHPlano
DFW metroplex
100–115 MPHEl Paso
West Texas
90–105 MPHLubbock
High Plains
105–120 MPHAmarillo
Panhandle
110–125 MPHPermian Basin too — see the Midland wind load guide (100–115 mph).
COASTAL COMPLIANCE
Texas Coastal Requirements
The TDI / TWIA framework that governs Gulf-facing construction — the rules that make coastal Texas distinct from the inland plains.
TDI Product Evaluations
Windows, doors, roof coverings & cladding evaluated for Texas wind — effectively mandatory for TWIA coverage.
TDIWPI-8 Certification
The Windstorm Inspection Certificate — required for TWIA insurance, signed by a Texas PE, RA, or certified inspector.
WPI-8TWIA Eligibility
State insurer of last resort across 14 coastal counties plus parts of Harris County — needs WPI-8 and current code.
TWIAWind-Borne Debris
Within 1 mile of the Gulf, all openings need impact-resistant glazing or shutters (ASTM E1886/E1996).
IMPACTPE Seal & Best Practices
Commercial: always requires Texas-licensed PE-sealed calculations (out-of-state licenses not accepted).
Coastal residential (HVHZ): PE seal required for WPI-8 · Inland residential: not typically required for simple structures, recommended otherwise.
Document: cite ASCE 7-16 sections, HVHZ provisions, TDI-evaluated products, wind-borne debris analysis, and TWIA standards.
RUN A TEXAS PROJECT
Calculate Texas Wind Loads Instantly
Pre-applied coastal-county overrides, TDI / TWIA awareness, Exposure C defaults for Gulf-facing sites, and WPI-8-ready reports — for any Texas ZIP.