ASCE 7-22 Low-Slope Roof Components & Cladding Wind Pressure Calculator

Low-rise enclosed / partially-enclosed buildings · Fig. 30.3-2A · θ ≤ 7°

Scope: Implements ASCE 7-22 Fig. 30.3-2A for gable, hip, and monoslope roofs with slope θ ≤ 7°, mean roof height h ≤ 60 ft, and rectangular plan. Roof slopes > 7° use a different figure and are not handled here — use full ASCE 7-22 procedures or licensed software for those cases.

How to Use

Enter wind speed, building dimensions, exposure, and the effective wind area (tributary area) of the roof component you're sizing. The calculator returns net design pressures for all four roof zones per ASCE 7-22 Fig. 30.3-2A. Use whichever zone applies to your component's location.

Zone definitions (low-slope roof):

Zone 1′ — interior of interior. Region of the roof more than 0.6h from any edge.
Zone 1 — interior near edges. Inside the 0.6h edge band but outside Zone 2.
Zone 2 — perimeter strip of width a along each edge (excluding corners).
Zone 3 — corner squares, a × a, at each building corner.

End-zone width a = MIN(0.1·L_least, 0.4·h), not less than MAX(0.04·L_least, 3 ft).

Inputs

Ultimate Wind Speed, V (mph) ?

Least Horizontal Dimension, L_least (ft) ?

Mean Roof Height, h (ft) ?

Roof Slope (°) ?

Effective Wind Area, A (ft²) ?

Topographic Factor, K_zt ?

Exposure Category ?

Enclosure Classification ?

Ground Elevation Factor, K_e ?

Calculation Results

Parameter	Value
Exposure Coefficient, K_h	-
Velocity Pressure, q_h (psf)	-
Directionality Factor, K_d	0.85
Internal Pressure Coefficient, GC_pi	-
End Zone Width, a (ft)	-

Net Design Pressures by Roof Zone (ASCE 7-22 Eq. 30.3-1)

p = q_h × K_d × (GC_p − GC_pi) at the entered effective wind area, with worst-case sign of GC_pi per direction.

Zone	GC_p (pos)	GC_p (neg)	P_max (psf) inward	P_min (psf) uplift	Load P_min (lbf)
1′ (deep interior)	-	-	-	-	-
1 (interior near edges)	-	-	-	-	-
2 (perimeter strip)	-	-	-	-	-
3 (corner)	-	-	-	-	-

Zone 1′ — deep interior

Zone 1 — interior near edges

Zone 2 — perimeter

Zone 3 — corner

Disclaimer: This calculator implements ASCE 7-22 components-and-cladding wind pressure equations for low-slope (θ ≤ 7°) low-rise roofs. Results are for engineering screening only and do not substitute for project-specific analysis by a licensed professional engineer. Verify exposure category, mean roof height, building geometry, and zone applicability for your project. This tool does not address overhangs, parapets, rooftop equipment, MWFRS pressures, or non-rectangular plan shapes. Oasis Engineering disclaims liability for use or misuse of this tool.