SOLAR BELT · LOCAL JURISDICTION STATE
Arizona Wind Load Requirements
Wind load design for the nation's solar capital — local code adoption (ASCE 7-16 / 7-22), Exposure C desert terrain, and monsoon haboob and downburst winds.
No Mandatory Wind-Load Permit Required
Arizona is one of 40 states where building departments do not require PE-sealed wind load calculations by law to obtain a building permit. Calculations may still be needed for insurance, manufacturer warranties, utility interconnection, or engineering best practices.
View all 40 states without mandatory permitsCODE ADOPTION · HOME RULE
A Local-Jurisdiction State
Arizona has no mandatory statewide building code (only the statewide International Fire Code 2018, with amendments). Each city and county adopts its own IBC / IRC edition — always verify with the local building department.
No Statewide Code
Codes adopted at the local jurisdiction level; editions vary between neighboring cities.
HOME RULETwo ASCE Editions
Newer adoptions reference ASCE 7-22; many jurisdictions still use the 2018 IBC with ASCE 7-16.
7-16 / 7-22Verify Locally
Confirm the adopted code edition with the building department before starting any solar project.
CHECK FIRSTPhoenix Engineering Design Criteria
| Parameter | Value |
|---|---|
| Basic Wind Speed (Risk Cat I) | 95 mph |
| Basic Wind Speed (Risk Cat II) | 105 mph |
| Basic Wind Speed (Risk Cat III) | 110 mph |
| Basic Wind Speed (Risk Cat IV) | 115 mph |
| Default Exposure Category | C (typical for solar) |
| Ultimate Design Wind Speed (Max) | 180 mph (2024 code) |
WIND CONTEXT · DESERT & MONSOON
Low Basic Wind, Localized Extremes
Arizona carries relatively low basic wind speeds, but monsoon season (June–September) drives localized haboob and downburst winds that design must respect.
Microbursts
Localized downdrafts produce concentrated, sudden gusts during monsoon thunderstorms.
DOWNBURSTHaboobs
Walls of dust ahead of thunderstorms, accompanied by strong sustained desert winds.
DUST STORMRapid Onset
Storms develop quickly, often with little warning, stressing mounting systems.
FASTDebris Loading
Wind-carried debris can impact solar panels and mounting hardware in open desert.
IMPACTMAJOR JURISDICTIONS · ADOPTED CODE
Code by Arizona City
Adopted editions and design winds differ across the state. Confirm details with each building department.
Phoenix
2024 IBC · ASCE 7-22 · effective Aug 1, 2025.
ASCE 7-22 · 2024 CODETucson / Pima County
2024 IRC · 110 mph design · updated 2024.
ASCE 7-22Scottsdale
2021 IBC · ASCE 7-16 · Exposure B with conditions.
ASCE 7-16Prescott
Residential 115 mph (Exp C) · commercial 95–115 mph by risk cat.
ASCE 7-16Detailed city pages: Phoenix and Tucson. Scottsdale and Prescott figures shown for reference.
SOLAR PV · ASCE 7-16 / 7-22
Solar Wind-Load Provisions
ASCE 7 sets specific provisions for wind loads on solar PV — critical for Arizona's utility-scale and rooftop systems.
Low-Slope Roofs (≤ 7°)
ASCE 7-16 §29.4.3 — rooftop solar on flat or nearly flat roofs.
§29.4.3Parallel to Roof
ASCE 7-16 §29.4.4 — flush-mounted panels on any roof slope.
§29.4.4Ground-Mount (≤ 45°)
Chapter 27 — treated as an open building with a monoslope roof.
CH. 27Ground-Mount (> 45°)
Chapter 27 — treated as a solid sign.
CH. 27New in ASCE 7-22 for Solar
Section 29.4.5 adds comprehensive provisions for fixed-tilt ground-mount systems, with refined pressure coefficients from wind tunnel testing and clarified effective-wind-area calculations for panel arrays. Per the standard: "Solar panels shall not be considered as part of the load path that resists the interconnection force unless evaluated or tested for such loading."
Typical Phoenix Solar Wind Pressures (ASCE 7-16, Exposure C)
| Zone | LRFD Pressure (psf) | Application |
|---|---|---|
| Interior | 25–35 psf | Field of roof away from edges |
| Edge | 35–45 psf | Within 10% of roof dimension from edge |
| Corner | 45–55 psf | Corner zones of roof |
EXPOSURE & STRUCTURAL · REQUIREMENTS
Exposure C & Roof Loading
Open desert terrain and "open patches" make Exposure C the Arizona default; rooftop PV must resist wind without overloading the roof.
Arizona Building-Official Preference
Phoenix projects have required engineers to use Exposure C per local amendments unless the Engineer of Record provides calculations proving Exposure B is acceptable — difficult given "open patches" common throughout Arizona.
| Category | Description | Arizona Application |
|---|---|---|
| Exposure B | Urban/suburban, wooded areas | Dense urban cores (Phoenix downtown) |
| Exposure C | Open terrain, grasslands | Default for most Arizona projects |
| Exposure D | Flat, unobstructed coastal areas | Not applicable in Arizona |
Scottsdale permits Exposure B when mean roof height ≤ 30 ft, the site is within the city's defined boundary conditions, and the Engineer of Record documents compliance.
Rooftop PV Structural Loading
| Requirement | Specification |
|---|---|
| Max Additional Truss Loading | 5 psf for all rooftop units |
| Point Load Maximum | 50 pounds |
| Engineering Report | May be required for roof capacity verification |
| Mounting Data Required | Fastener sizes, dead load, wind uplift calculations |
Load Case 1: dead load (incl. PV weight) + snow. Load Case 2: dead load (excl. PV weight) + roof live or snow load, whichever is greater. Ground-mount foundations must resist uplift per ASCE 7 and account for soil conditions and monsoon-runoff scour.
RISK CATEGORIES · ASCE 7
Match the Risk Category
Risk category selects which basic-wind-speed map you read — higher category, longer return period, higher design wind.
Category I
Low-hazard: minor agricultural and storage structures.
300-YR MRICategory II
Standard occupancy: homes, offices, retail — most buildings.
700-YR MRICategory III
Substantial hazard: large assembly, schools, key utilities.
1,700-YR MRICategory IV
Essential facilities: hospitals, fire/police, emergency centers.
3,000-YR MRIGET STARTED
Need Arizona Solar Wind Load Calculations?
Professional ASCE 7 calculators built for Arizona's Exposure C terrain, monsoon conditions, and solar-specific provisions.
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