Blocking should be at least how many times the surface area of the outrigger pad?

• A. 3 times
• B. 2 times
• C. 4 times
• D. 1 time

Answer: (A)

Distributing the crane’s load over a larger surface helps prevent ground damage and enhances stability. Blocking under the outrigger pad increases the contact area, which lowers the ground pressure and reduces the risk of sinking or tipping on softer surfaces. The minimum standard is to make the blocking area at least three times the surface area of the outrigger pad, so the overall footprint is significantly larger than the pad itself.

If you used only two times the pad area, the ground would bear more pressure, increasing the chance of ground failure. Using four times would certainly be more conservative, but the required minimum is three times, which balances safety with practical setup. So, the correct approach is to ensure blocking provides at least three times the pad’s surface area.