Installing an In-Ground Trampoline: Retaining Wall Solutions

Sinking a trampoline requires a stable pit wall. The homeowner asks if a retaining wall is needed inside the excavation.

Patented Sheet-Piling System

In-Ground Trampolines uses interlocking steel sheet piling—engineered, durable, and thin-profile.

DIY Alternative: Rigid Root Barrier Panels

• High-density polyethylene (HDPE) panels that lock into a circle (e.g., Vespro, Villa Root Barrier).
• Install panels vertically around the pit perimeter.
• Add PVC pipe bracing (irrigation pipe) at top and bottom rims for rigidity.
• Orient panel ridges outward (toward soil) to avoid sharp edges inside the pit.

Why Not Concrete or Timber?

They're overkill, expensive, and hard to install in a tight circle. Sheet piling or root barrier is purpose-built, faster, and cheaper.

Key Tip

Match the system's dimensions to your trampoline frame. Follow the manufacturer's installation manual precisely.