Wind Velocity Pressure
The wind pressure on a wall or roof at a design wind speed.
Example
You enter
- Basic wind speed (mph) 100
- Exposure C
You get
- Velocity pressure q 25.6 psf
- qz at 30 ft 25.09 psf
- Windward pressure 20.0704
- Leeward pressure -12.544
Details, formula, and sources
q = 0.00256 * V^2 with windward and leeward Cp.
Velocity pressure q = 0.00256 × V² × Kz × Kzt × Kd × Ke (psf). Public ASCE 7-22 formula. V from NOAA basic-wind-speed maps.
ASCE 7-22 (Minimum Design Loads for Buildings and Other Structures). Section 26.10. Public formula; licensed text not reproduced. NOAA basic wind speeds (public domain).
ASCE 7 licensed; ASCE-7 hazard tool free at asce7hazardtool.online (per ASCE outreach). NOAA wind data free at hazards.atcouncil.org.
Estimate. AHJ and licensed structural engineer govern.
Field names used by the API: V_mph, exposure, q_psf, qz_at_30ft_psf, pressure_windward_psf, pressure_leeward_psf
- Air-density factor 0.00256 ASCE 7-22 Section 26.10ASCE 7-22 by name
- Exposure / Kz / Kzt / Kd / Ke user-supplied or from data/construction/wind-snow-zones.jsonASCE 7-22