Sheet Piling & Retaining Walls

Sheet piles are interlocking steel, vinyl or concrete planks driven into the ground to hold back soil and water. Retaining walls of block, concrete or timber do the same job above ground. Both carry a huge force, and failures can be sudden.

• Excavation
• Marine
• Landscape & Civil

Hazards

• Lifting and driving: sheets are heavy and awkward. Hammers and vibratory drivers cause crush, struck-by and noise hazards.
• Underground utilities hit by piles. Call 811 and verify. See Call 811.
• Wall movement or failure from overloading, water pressure or poor drainage.
• Falls into the excavation or from the wall top.
• Vibration that can disturb nearby soil and structures. See Excavations Near Structures.
• Water flowing under or through the wall, which can cause sudden collapse.

Installing sheet piling

• Follow an engineer's design for length, driving depth and bracing
• Use rigged lifting with the correct slings and clamps. See Rigging Basics
• Keep everyone clear of the hammer, leads and swinging sheets; use tag lines
• Use a spotter and an exclusion zone around the driving rig
• Install braces, walers and struts at the designed levels as the excavation goes down, not after
• Monitor movement of the wall and nearby ground with survey points if the plan requires it

Retaining walls

• Walls over about 4 feet high often need an engineer's design and a permit. Check local rules.
• Provide drainage behind the wall (gravel and drains) so water cannot build pressure.
• Do not stack heavy loads near the top of the wall without an engineer's approval.
• Compact backfill in layers and keep heavy machinery back from the edge. See Backfilling & Compaction.

Warning signs of trouble

• Leaning, bulging, new cracks or gaps
• Muddy water seeping through or beneath the wall
• Settling or cracks in the ground, roads or buildings behind it
• Loose or bent braces

If you see these, stop work, get everyone out of the area and call a competent person or engineer.

Last updated: October 8, 2026