Free wind load calculator to SANS 10160-3
Works out the wind pressures on the walls and duopitch roof of a building, zone by zone. Free, runs in your browser, and prints a calc sheet with clause references.
No install, no card. The result shows without an account; a free account opens every check with its clause, the calc sheet and the bending schedule for 3 designs a month (one calculator, 24 hours). Calculator packs, coming soon, remove the limit.
What the calculator checks.
Every check is shown with the working, the clause and a pass or fail.
- Basic and peak velocity pressure (SANS 10160-3 cl. 7.3 and 7.4), terrain categories A to D (Table 1), air density with altitude (Table 4)
- Wall pressure coefficients for zones A to E (cl. 8.3.2, Table 6)
- Duopitch roof coefficients for zones F to J (cl. 8.3.5, Table 10), suction and pressure cases
- Local Cpe,1 values for cladding, fixings and purlins
- Internal pressure Cpi, fixed or from the openings (cl. 8.3.9)
- Net pressure per zone, the governing wall pressure and roof uplift, and a reminder to set the basic wind speed for your municipality (Annex A)
Codes: SANS 10160-3, EN 1991-1-4
A tool to check a design, not a design approval. Check the results and have the design signed by a registered professional engineer.
Short answers.
About this free calculator.
Is the wind load calculator free?
Yes. It is free to use: enter your own values and every check shows on the page with its result.
Do I need an account?
No account is needed to use it: every check shows on the page with its result and clause, with a calc sheet summary. Without an account you see the result. A free STATIX account (email or Google, no card) opens every check with its clause, the full calc sheet to print or save as a PDF and the SANS 282 bending schedule for 3 designs a month (one calculator, open for 24 hours). Paid plans, coming soon, will make them unlimited.
Which code clauses does it use?
The calc sheet names the clause on every step: SANS 10160-3 cl. 7.4 and 7.3 (Table 1) for the velocity pressure, cl. 8.3.2 (Table 6) for walls, cl. 8.3.5 (Table 10) for the roof and cl. 8.3.9 for internal pressure. Choose EN 1991-1-4 and the sheet follows that code.
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