Open / free-roof wind pressures (ASCE 7 C_N method), snow load with Pg→Pf conversion, NDS member screening, anchorage demand, and lead qualification report. Preliminary screening & education only — NOT engineering advice and NOT a sealed design.Rev. 2026-06-09 (open-roof method) · A free tool by Oasis Engineering LLC.
⚠ Screening & education only. This tool is NOT engineering advice, NOT a sealed design, and NOT a substitute for a licensed Professional Engineer. Verify all inputs, coefficients, and code editions independently. Full disclaimer
Roof Zones
Key Results
Superstructure Checks
Lead Summary
Before you use this tool
This is a preliminary screening calculator for open-roof structures (gazebos, pergolas). It is for education and early feasibility only.
It is not engineering advice and not a sealed design. No engineer has reviewed your inputs or results.
Wind, snow, and member checks use simplified screening methods. Your jurisdiction's adopted code and site conditions govern.
Anchoring or modifying a real structure based on these numbers without review by a licensed Professional Engineer is unsafe and may be illegal.
The software is provided as is, without warranty. You accept full responsibility for any use of the results.