Flat Roof — MWFRS Wind Pressure Worksheet
Geometry-driven MWFRS worksheet. Roof slope, mean roof height, pressure coefficients and portal-frame tributary line loads are calculated automatically from the entered geometry and design inputs.
Building Geometry
Velocity Pressure — Directional / Envelope Base Terms
Kh (at mean roof height h)—
qh—
Kz (0.85h, low pt.)—
qz (0.85h)—
qz = 0.00256 · Kz · Kzt · Kd · Ke · V² (internal Imperial calculation). Display units follow the selected unit system.
Wall Pressures (MWFRS)
| Surface | Cp (Auto) | q·G·Cp | p (GCpi +) | p (GCpi −) | Frame Load + | Frame Load − |
|---|
Roof Zone Pressures
| Zone | Cp (Auto) | q·G·Cp | p (GCpi +) | p (GCpi −) | Frame Load + | Frame Load − |
|---|
Elevation Diagram & Zone Map live-labeled
Basic Wind Speed—
Exposure—
Mean Roof Height h—
Enclosure—
Governing Suction (roof)—
Governing Pressure (wall)—
Suction (−)
Pressure (+)
Ridge / Zone edge