PENNSYLVANIA · ALLEGHENY COUNTY
Where Three Rivers Carve the Wind Through Pittsburgh's Hills
At the Point, the Allegheny and Monongahela join to form the Ohio — and the steep ridges around them split one regional wind map into sheltered valley floors and exposed hilltops. Design speeds run 100–110 mph under the Pennsylvania UCC and ASCE 7-22.
TERRAIN-DRIVEN WIND
One Map, Two Wind Worlds Across Allegheny County
Pittsburgh's 100–110 mph regional speed is nearly uniform — but the topography is not. Ridges rising 400–700+ ft above river level speed wind up over their crests, while the valley floors sit sheltered and channeled.
Exposed Hilltops & Ridges
Mount Washington, Grandview Avenue, Squirrel Hill heights and Observatory Hill sit in wind speed-up zones. ASCE 7-22 Section 26.8 can push Kzt above 1.0 — and because pressure scales with V², even a modest crest amplifies loads sharply.
Kzt > 1.0 · SITE STUDYSheltered River Valleys
The North Shore, Strip District, South Side Flats and the Golden Triangle sit on valley floors where Kzt typically returns to 1.0. Sheltered by surrounding hills, they still see wind funneled along the Allegheny, Monongahela and Ohio corridors.
Kzt ≈ 1.0 · CHANNELEDPERMIT-READY COMPLIANCE
What Allegheny County Plan Review Expects
Pittsburgh runs under the Pennsylvania Uniform Construction Code (IBC adoption) referencing ASCE 7-22. Sealed, location-specific wind documentation moves projects through review.
Code & Standard
Pennsylvania UCC adopts the IBC with state amendments and references ASCE 7-22 for wind. Confirm the currently adopted edition for your project.
PA UCC · ASCE 7-22PA-Sealed Engineering
All structural wind calculations must be prepared or supervised and sealed by a Professional Engineer licensed in Pennsylvania, with exposure and Kzt justified for the site.
PE SEAL REQUIREDCity PLI & County Review
The City of Pittsburgh Department of Permits, Licenses and Inspections (PLI) is the AHJ inside city limits; Allegheny County handles permits beyond them. Third-party review applies to many projects.
PLI · ALLEGHENY CO.RISK CATEGORY & THE MAP YOU READ
Higher Risk Category, Higher Speed Map
Risk category does not apply a multiplier — it selects which ASCE 7-22 wind speed map (return period) you read V from. The same Pittsburgh site lands on a faster map as the category rises.
| Risk Category | Speed Map (MRI) | Typical Pittsburgh Occupancies |
|---|---|---|
| I | 300-year map (lowest) | Minor storage, agricultural, low-hazard structures |
| II | 700-year map · 100–110 mph | Homes, offices, retail, hotels, most buildings |
| III | 1,700-year map | Schools, assembly >300, substantial-hazard facilities |
| IV | 3,000-year map (highest) | Hospitals, fire/police, emergency shelters, EOCs |
OFFICIAL JURISDICTION RESOURCES
Verify Direct With the Authorities
Confirm locally adopted values, amendments and licensing before you submit.
NEARBY & STATEWIDE
Compare Across Pennsylvania & Beyond
See how a flat eastern river city differs from Pittsburgh's hills, then check statewide adoption and the wind-speed map.
PITTSBURGH · ASCE 7-22
Run Pittsburgh Wind Loads in Minutes
Enter a Pittsburgh address or ZIP for the location-specific 100–110 mph velocity, Exposure B guidance and PE-ready ASCE 7-22 output for PLI submission. Hilltop topographic factors (Kzt) still warrant a site-specific study by a PA-licensed PE.