TEXAS · COLLIN
Corporate-campus wind design on the Collin County blackland prairie
Plano is a North Dallas suburb of glass headquarters and master-planned subdivisions, built on flat prairie with no coast and no hills. Its design wind speed is set by North Texas severe-storm season, not the Gulf.
NORTH TEXAS CLIMATE
What a flat Collin County prairie does to the design gust
Plano has no relief and no coast — its 100–115 mph map value comes from supercell and squall-line season sweeping unobstructed across the blackland plain.
Squall-line straight winds
Spring fronts drive damaging gusts straight across the open prairie with little to slow them.
CONVECTIVECollin County tornado exposure
The county sits in North Texas tornado country and logs storms most years; the base speed reflects it.
SEVEREHail-and-uplift roof demand
Campus and subdivision roofs across Plano resist storm uplift and severe hail in the same event.
ROOF SYSTEMSNo coastal certification
Far inland from the Gulf — no wind-borne debris zone, no windstorm certificate, no HVHZ rules apply.
INLANDASCE 7-22 tornado note: The 2022 edition added Chapter 32 tornado-load provisions, but for Plano these are a qualitative trigger only — they apply chiefly to higher-risk-category buildings. Standard Plano occupancies are still governed by the synoptic basic wind speed map; the prairie tornado climate is what keeps that mapped value at 100–115 mph rather than a lower inland figure.
TERRAIN CALL
Exposure in a master-planned suburb
Plano is almost entirely built-out and tree-lined, so Exposure B is the routine call — but corporate sites fronting wide arterials and open parking can read as something rougher.
Exposure B — the Plano default
Established subdivisions, mature canopy, and dense Legacy-area build-out shelter most sites. This is the baseline for the typical Plano permit.
SUBURBANExposure C — open campus frontage
Large corporate-campus lots, wide tollway frontage and expansive surface parking can present open terrain, lifting pressures above the sheltered case.
OPEN FRONTAGEWhere the line moves: Plano's headquarters campuses sit on big setbacks with parking seas and broad roads upwind. Even inside a built-out suburb, an isolated campus tower can warrant the more conservative Exposure C on its exposed faces — verify the upwind terrain per ASCE 7-22 rather than defaulting to B.
RISK & RETURN PERIOD
How occupancy lifts Plano's mapped wind speed
ASCE 7-22 dropped the wind importance factor. A higher risk category instead reads a longer-return-period map, so essential and assembly Plano buildings design to a higher gust than homes do.
| Risk Category | Plano Mapped Gust | Representative Buildings |
|---|---|---|
| I · 300-yr map | ~95–110 mph | Minor agricultural, temporary and storage structures |
| II · 700-yr map | 100–115 mph | Homes, retail, hotels, offices and most standard occupancies |
| III · 1,700-yr map | ~110–125 mph | Schools, large assembly, corporate-headquarters occupancies |
| IV · 3,000-yr map | ~115–130 mph | Hospitals, fire stations, shelters and emergency centers |
PERMIT PATHWAY
Clearing a wind-load review with City of Plano
Texas has no statewide residential code mandate, so Plano builds on the IBC with local amendments. These are the six pieces a Collin County submittal turns on.
IBC + Plano amendments
City of Plano adopts the International Building Code with local amendments referencing ASCE 7-22.
CODE BASISMapped basic wind speed
Pull V from the ASCE 7-22 map for the site: 100–115 mph for ordinary Plano occupancies.
V = 100–115Exposure determination
Justify B for sheltered subdivisions or C for open campus frontage based on upwind terrain.
B OR CRisk category check
Confirm occupancy — campus assembly and essential uses read a higher return-period map and gust.
TABLE 1.5-1Flat-terrain topographic factor
Plano's level prairie carries no speed-up, so Kzt is 1.0 — no escarpment or hill correction applies.
Kzt = 1.0PE-sealed calculations
Commercial and campus Plano projects need calcs sealed by a Texas-licensed Professional Engineer.
TEXAS PEOfficial Plano references: Plano Building Inspections · Plano Online Permits · Collin County Development Services · Texas Board of Professional Engineers
INLAND VS GULF
Why a Plano campus is not a Texas coast structure
Same state, two different design problems. Suburban North Texas trades hurricane debris rules for tornado-grade base winds on flat ground.
| Requirement | Plano (Inland Suburb) | Texas Coast HVHZ |
|---|---|---|
| Design wind speed | 100–115 mph | 140–160 mph |
| Exposure category | Mostly B, some C on campus frontage | C required |
| Topographic factor | Kzt = 1.0 (flat prairie) | Kzt = 1.0 (flat coast) |
| TDI product evaluation | Not required | Required for TWIA |
| Wind-borne debris | Not required | Impact protection required |
| Primary hazard | Tornadoes, severe thunderstorms | Hurricanes, tropical storms |
ACROSS THE METROPLEX
Carry these loads to the rest of North Texas
Wind speeds run consistent across the DFW suburbs, but exposure shifts where campuses and tracts meet open prairie. Branch out from Plano to the wider state map.
Texas statewide requirements
The full Texas wind-load picture, from inland prairie to the Gulf coastline.
STATE HUBWind speed by location
Look up the mapped basic wind speed for any U.S. address or ZIP.
LOOKUPAll state requirements
Compare adopted codes and ASCE 7 editions across every U.S. state.
DIRECTORYFINISH THE PLANO CALC
Turn the North Texas wind map into a sealed permit set
Enter a Plano address and the calculator applies the 100–115 mph gust, sorts Exposure B or C, runs the risk category, and returns MWFRS and C&C pressures ready for review.