(888) 743-7320

How to Properly Size Bigfoot Outrigger Pads for Maximum Stability

March 31, 2025

General Information, News

Bigfoot Outrigger Pad in use and how to size them for your equipment

Sizing Your Outrigger Pad

When operating heavy equipment like cranes, aerial lifts, and concrete pump trucks, maintaining stability is essential. A solid foundation starts with selecting the right outrigger pads, and at Bigfoot Outrigger Pads, we know just how critical proper sizing is. Using the wrong pad size can lead to ground failure, equipment instability, and even catastrophic accidents.

Our guide outlines the essential steps to choose properly-sized pads and enhance your job site safety.

Why Proper Sizing Matters

Bigfoot outrigger pads distribute the load of heavy equipment over a larger surface area, reducing ground pressure and preventing equipment from sinking or tipping. If the pad is too small, excessive pressure can cause soil displacement, leading to instability. Conversely, overly large pads may be unnecessary and add unnecessary weight and cost.

Key Factors in Sizing Bigfoot Outrigger Pads

1. Determine the Ground Bearing Capacity

The first step in selecting the right outrigger pad size is understanding the ground’s bearing capacity, which is measured in pounds per square inch (PSI). Common surface types and their approximate bearing capacities include:

  1. Loose Sand: 0.5-2 PSI
  2. Soft Clay: 1-2 PSI
  3. Firm Soil: 2-4 PSI
  4. Compacted Gravel: 5-12 PSI
  5. Concrete/Asphalt: 100+ PSI

2. Identify Equipment Load and Outrigger Force

Each piece of equipment has a specified maximum outrigger force, which can be found in the manufacturer’s specifications. This force, combined with the ground’s bearing capacity, will determine the required surface area for the outrigger pad.

3. Calculate the Minimum Pad Size

To determine the correct size outrigger pad, use this formula. 

  • Divide the force in lbs by the PSI
    Force ÷ PSI = Area in square inches
  • Convert square inches to square feet
    Area in sq in ÷ 144 = Area in sq ft
  • Round up to the nearest whole number.

For example, if a crane exerts 50,000 lbs of force per outrigger and the ground has a bearing capacity of 5 PSI, the required coverage is at least 70 square feet. Selecting an outrigger pad that meets or exceeds this area ensures maximum stability.

4. Consider Load Distribution and Bigfoot Outrigger Pad Material

  1. Thickness: Thicker pads are needed for softer ground to prevent flexing.
  2. Material: High-density polyethylene (HDPE) pads are lightweight and durable, while wood and steel options are heavier but may offer added strength.

In Conclusion

Properly sizing Bigfoot outrigger pads is critical to job site safety and equipment longevity. To ensure maximum stability and efficiency:

  1. Always verify ground conditions before setup.
  2. Follow manufacturer recommendations for outrigger pad usage.
  3. Regularly inspect and maintain pads for wear and damage.

Properly sizing Bigfoot outrigger pads is critical to job site safety and equipment longevity. By following these steps, you can ensure maximum stability and efficiency in your operations.

References

  1. American Society of Mechanical Engineers (ASME) – Load Handling Guidelines
  2. Occupational Safety and Health Administration (OSHA) – Crane and Derrick Safety Standards
  3. National Commission for the Certification of Crane Operators (NCCCO) – Outrigger Pad Recommendations
  4. Construction Industry Manufacturers Association (CIMA) – Best Practices for Equipment Stability