Most skylight cleaning robots should stop work above 10-12 m/s wind (about 22-27 mph) on exposed roofs in 2026, and above 8 m/s on tall buildings where gust amplification adds 30-50 percent to ground readings. Ground forecast is not roof wind.
Wind is the failure mode that catches operators off guard because the machine does not complain. A robot happily cleaning a 20-degree skylight at ground level in 9 m/s wind may face 13-14 m/s at 40 m elevation, and that is where suction margin disappears.
How much wind is too much for a robot on glass?
Think in two numbers. The static limit is the wind the machine holds against while parked and gripping. The working limit, always lower, is where it can still move and clean predictably. A unit rated to 15 m/s static may only work cleanly to 10 m/s. Vendors quote the static figure because it is bigger. Ask for the working limit on wet glass and the elevation it was measured at.
| Roof height | Work limit | Park/stow limit |
|---|---|---|
| Under 15 m | 12 m/s | 15 m/s |
| 15-50 m | 10 m/s | 13 m/s |
| Above 50 m | 8 m/s | 11 m/s |
Why gust amplification matters more than average wind
Building corners and parapets funnel wind. A steady 8 m/s can arrive as a 13 m/s gust at a roof edge, and it lasts 2-3 seconds, long enough to peel a suction cup. This is why tall-building jobs need an on-roof anemometer, not a weather app reading for the district. If the site has no fixed mast, carry a handheld unit and log readings every 30 minutes.
What should the tether rule be?
Any robot working above glass you cannot see through, or above 12 m, should have a secondary tether regardless of suction rating. Suction is the primary hold; the tether is the insurance that a dropped machine does not become a dropped-object report. Anchor the tether to a rated point, and keep it shorter than the drop to any occupied area. The Lingfeng S1 ships tether-ready; a tracked unit without a tether anchor is not ready for exposed roofs.
Who must shut down early?
Sites in typhoon-season coastal areas, and any roof where the robot is the only thing between a machine and a public street below. If your insurance policy treats roof work as high-risk, the breakpoint is likely stricter than the manufacture spec. Match the stricter of the two. Also stop when rain starts, even light rain; wet glass plus wind is the worst combination for grip, and the windshield wiper logic in some navigation software misreads rain streaks as edges.
A pre-shift wind check takes 90 seconds and prevents the one incident that ends a robot programme. Our safety and compliance guide covers the full checklist, and site-specific limits can be scoped via the contact page.
Key Takeaways
- Stop work above 10-12 m/s on exposed roofs; 8 m/s on tall facades.
- Ground wind understates roof wind by 30-50 percent on tall buildings.
- Use the working limit on wet glass, not the bigger static rating.
- Tether any robot above 12 m or over unseen glass, every time.
- Stop at the first drop of rain; wet plus wind is the real hazard.