What should be checked before placing a 4-ton spider crane on a rooftop?
2026-10-28
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Onchtech recommends having a structural engineer verify the roof and access route capacity before placing a 4-ton spider crane on a rooftop. Account for approximately 3 tons of machine weight, concentrated outrigger loads and dynamic operating loads. Then check access dimensions, outrigger clearance, rated capacity at the actual working radius, roof edges and overhead obstructions, and secure a lifting plan and required permits.
Before placing a 4-ton spider crane on a rooftop, Onchtech recommends completing these checks:
- Verify structural capacity. Have a structural engineer check the roof and the route used to bring the crane up. The assessment should account for approximately 3 tons of machine weight, concentrated outrigger loads and dynamic operating loads.
- Confirm access and working space. Check access dimensions and the space available to deploy the outriggers, as well as roof edges and overhead obstructions.
- Check lifting capacity. Confirm the crane’s rated capacity at the actual working radius.
- Complete the required preparations. Put a lifting plan in place and obtain the necessary permits.
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