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Polyurethane Deep Injection and Soil Densification

Poor compaction, water erosion, broken pipes, and organic material in the soil can all lead to settling of a foundation or a roadway. Unstable soil can threaten the stability, security, and safety of infrastructure and can damage, degrade, and even destroy structures, such as buildings, bridges, and roads.

Pacific Coast Underpinning offers soil densification using high-density polymer. The polyurethane we use is light and durable and can lift without increasing the weight of the soil underneath. It is waterproof, meaning, it does not wash out or sag. It will stand the test of time. The process has a minimal footprint, it is powerful, painless, and rapid. It gets to the root of the problems in the soil, fills the void, and brings the structure back to level.

This is all accomplished with minimal imposition or downtime to the property owner or occupying business. The results from lifting and/or stabilizing will last for decades.

Polymer foams are environmentally safe and do not react with the soil or emit harmful chemicals.

Applications include, but are not limited to:

  • Bridge Adbutments
  • Highway Approach Slabs
  • Rigid and Flexible Pavements
  • Ports and Airports
  • Settled Buildings
  • Soil Densification and Encapsulation
  • Lift Stations
  • Pipe and Tunnel Segments
  • Equipment Pads
  • Walkways
  • Warehouses

Top seven reasons to choose polyurethane foam injection:

The Problem:
What causes unstable soil?

  • Erosion, poor drainage, improperly placed downspouts, leaking drain pipes, and broken water lines are common culprits.
  • Poor compaction When backfilling on a jobsite – The contractor is supposed to compact the backfill by driving over it with heavy equipment. However, this isn’t always done properly for one reason or another.
  • Freezing and thawing accelerates the erosion process. Cold weather freezes moisture trapped in tiny cracks. When this water freezes, it expands, subsequently pushing on the rocks and breaking them into smaller pieces. As the freezing and thawing continue, rock and sediment are continually broken down.
  • Biological decay – Construction trash pits, buried trees, and other biodegradable materials all break down. Sometimes structures are built over these areas.

The Solution: Deep Injection for Soil Stabilization
How does polymer foam help?

  • Reinforcing eroded areas – It displaces water and cures into a solid mass reversing the erosion process.
  • Permeating soil – It permeates loose soil to create a strong substrate.
  • Filling voids caused by decay – It fills voids before it cures.

The Solution: Deep Injection for lifting concrete and structures
How does deep lift with structural polymers help?

  • Compacting soil: It penetrates multiple layers in the soil to create levels of high density polymer and tightly squeezed soil.
  • Filling voids caused by decay: This process displaces water filled voids in the soil, seals leaks in infrastructure, and encapsulates decaying material.
  • Lifting pavements and structures back to level height: Polyurethane offers a 3-dimensional repair to the soil while bringing the structure back to level.

What are the results?

  1. Use of slab or structure the same day as repair – Cures to 90% full strength in 15 minutes. In most cases the site is ready for traffic right after clean up.
  2. Lift and/or stabilization lasting decades.


Pacific Coast Underpinning supports commercial projects across the state of California.

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