Calculator Inputs
Formula Used
The calculator uses a simplified velocity pressure workflow for preliminary construction checks.
qz = 0.00256 × Kz × Kzt × Kd × Ke × V²
Pwall = qz × (G × |Cpe| + |GCpi|)
Proof = qz × (G × |roof Cpe| + |GCpi|)
F = P × A and M = F × lever arm
PASD = 0.60 × Pultimate
Kz is estimated from exposure category and mean roof height. Fort Lauderdale projects should verify final values using the governing code, local ordinance, and permit documents.
How to Use This Calculator
- Enter the project name and select the site note for Fort Lauderdale.
- Enter the verified basic wind speed for the exact address.
- Select exposure based on upwind terrain and water proximity.
- Enter height, topographic, directionality, and elevation factors.
- Add pressure coefficients for walls and roof uplift.
- Enter projected area, roof dimensions, and the moment lever arm.
- Press the calculate button and review the result above the form.
- Download CSV or PDF results for coordination records.
Example Data Table
| Example | Vult | Exposure | Height | Cpe | Area | Use case |
|---|---|---|---|---|---|---|
| Low commercial wall | 170 mph | C | 30 ft | 0.80 | 600 sq ft | Main wind force estimate |
| Roof edge check | 170 mph | C | 30 ft | -1.30 | 2400 sq ft | Uplift and anchorage review |
| Open shoreline exposure | 170 mph | D | 45 ft | -0.90 | 900 sq ft | Conservative suction comparison |
Fort Lauderdale Wind Load Planning
Fort Lauderdale sits inside Broward County's hurricane design environment. Wind design here needs careful inputs. Small changes can shift pressure quickly. Height, exposure, roof shape, enclosure, and effective area all matter. A coastal parcel usually sees stronger mapped wind demand than an inland parcel. Always confirm the final basic wind speed with the local authority.
Why These Inputs Matter
The calculator starts with ultimate three second gust speed. It then applies exposure and height factors. Exposure B suits dense urban terrain. Exposure C suits open terrain. Exposure D suits shoreline or open water exposure. Topographic and directionality factors adjust the velocity pressure. Pressure coefficients convert that pressure into wall load, roof suction, and uplift checks.
Practical Construction Uses
Builders can use the estimate during early takeoff. It helps compare cladding zones, canopy loads, rooftop equipment, parapets, and sign faces. Designers can check whether a chosen anchor pattern looks reasonable. Project managers can flag areas needing engineer review before pricing. The tool also gives ASD pressure, total force, and overturning moment. These values support clear discussions with suppliers.
Limits and Safety
This calculator is not a sealed engineering report. It does not replace ASCE procedures, product approvals, delegated design, or permit review. Fort Lauderdale projects may fall under high wind and debris rules. Openings, shutters, garage doors, and roof edges need special attention. Components and cladding can govern even when the main frame looks acceptable.
Better Results
Use measured dimensions. Use the correct mean roof height. Select exposure based on the upwind terrain. Enter the exact pressure coefficient from the design case. Keep the internal pressure setting conservative when openings are uncertain. For final design, use site specific hazard data and a licensed professional. Save the result table for coordination, but verify every assumption.
Permit Review Notes
Permit reviewers often ask for traceable assumptions. A clear worksheet reduces confusion. It shows the selected speed, exposure, height, coefficients, and load path. Keep product approval limits nearby. Compare calculated pressures with tested ratings. Window, door, roofing, and anchor ratings should exceed demand. When pressure changes by zone, check the worst zone first. Edge and corner zones often control. Document any field change before installation. Recheck assumptions after elevation, parapet, enclosure, or site exposure changes. Keep clear records organized.
FAQs
Is this calculator specific to Fort Lauderdale?
Yes. It is arranged for Fort Lauderdale and Broward County wind planning. You still must enter the exact verified wind speed for the project address.
What default wind speed should I start with?
A common preliminary Risk Category II starting point near eastern Fort Lauderdale is 170 mph. Exact values depend on mapped location and current code requirements.
Does this replace an engineer's calculation?
No. It is a planning tool only. Final wind design should use official hazard data, governing standards, product approvals, and professional judgment.
What is exposure category?
Exposure describes upwind surface roughness. Dense city terrain may use B. Open terrain often uses C. Shoreline or open water exposure may require D.
Why does roof height matter?
Wind pressure usually increases with height. The Kz factor adjusts velocity pressure for the selected mean roof height and exposure category.
What is GCpi?
GCpi represents internal pressure. Enclosed buildings often use lower values. Partially enclosed buildings can have higher internal pressure and larger demand.
Why are suction loads important?
Suction can pull cladding and roof parts outward. It often controls anchors, fasteners, roof edges, signs, and canopy connections.
What does ASD pressure mean?
ASD pressure is a reduced comparison value. This page uses 0.60 times the ultimate pressure for quick preliminary checks.
Can I check windows and doors?
You can compare calculated psf with product ratings. Use the correct component zone, effective area, pressure coefficient, and approved rating.
Why does the calculator estimate anchors?
It divides estimated roof uplift by entered anchor capacity. This gives an early count only. Spacing, edge distance, substrate, and approvals still control.
When should I use exposure D?
Use exposure D when the governing upwind direction includes open water, shoreline exposure, or terrain matching code definitions. Confirm it before permitting.