Wind Calculator

Calculate ANSI/SPRI/FM 4435/ES-1 design pressures for fascia, coping, gutter, and drip edge per ASCE 7-22 — IBC Section 1504.5.

Select Component Type

Basic Wind Speed — V (mph)

From ASCE 7-22 Fig. 26.5-1 for your Risk Category

Mean Roof Height — h (ft)

Exposure Category

Risk Category (IBC Table 1604.5)

Applied: Kzt=1.0 (flat) · Kd=0.85 (C&C, Table 26.6-1) · Ke=1.0 (sea level) · G=0.85 (rigid)

Fascia / Gravel Stop Results

ANSI/SPRI ES-1 RE-2

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Kz (Table 26.10-1)

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qz (psf)

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qz·G (psf)

– Enter values and select a component to calculate

RE-1 — Membrane Termination

Tests roof edge termination for mechanically attached and ballasted systems. Load = design load applied at the roof deck. Evaluates perimeter attachment against membrane billowing forces.

RE-2 — Fascia / Gravel Stop / Drip Edge Pull-Off

Horizontal pull-off test on face of metal edge flashing. Design load = qz · G · GCp where GCp = 2.5 (corner zone). The tested resistance of the product must meet or exceed this calculated load.

RE-3 — Coping Pull-Off Test

Simultaneous horizontal (outward) + vertical (uplift) loads on coping cap. GCp = 3.2 for corner zone. Both face and back leg are tested separately. Failure = any component loss of securement.

Disclaimer: This calculator is for preliminary estimation only. Final design loads must be verified by a licensed structural engineer using ASCE 7 and the applicable IBC version for your jurisdiction.