servicesunderpinning

Underpinning

Roadway with crack through center

What is Underpinning?

Underpinning is a structural stabilization method that restores foundation support and corrects settlement by strengthening the underlying soils. Using precision polymer injection, URETEK reinforces and densifies weak subgrade zones, transferring loads to more competent layers below. This trenchless approach provides reliable foundation stabilization without excavation or structural interruption.

Problems It Solves

  • Foundation settlement or uneven load transfer
  • Structural cracking or differential movement in buildings
  • Weak or compressible soils beneath footings or slabs
  • Deterioration of original foundation bearing strength
  • Need for added support due to new loads or extensions

Types of Polymers Used

High-Density Polyurethane Foams

  • Expands to densify and reinforce foundation soils
  • Restores bearing capacity with minimal surface impact
  • Provides rapid curing for immediate load transfer

Structural Polyurethane Resins

  • Forms rigid load-bearing columns beneath foundations
  • Improves structural support and reduces differential settlement
  • Extends the service life of existing foundations

Hydro-Insensitive Polymers

  • Performs effectively in wet or saturated conditions
  • Prevents further soil weakening or erosion from groundwater
  • Maintains compressive strength over time
Two construction workers in safety vests looking over worksite with clipboard

Benefits of Underpinning

URETEK’s underpinning solutions provide deep foundation stabilization using expanding polymer injection. The process corrects settlement, restores structural alignment, and delivers long-term support—without invasive excavation or heavy equipment.

Restore Foundation Stability Without Excavation

  • Restores foundation stability and load-bearing performance
  • Corrects settlement and structural misalignment
  • Provides rapid, non-disruptive foundation repair
  • Strengthens subgrade soils beneath critical assets

Key Applications

Commercial Buildings

Reinforces foundations supporting heavy loads and equipment

Industrial Facilities

Strengthens soils beneath tanks, machinery, and concrete slabs

Bridge Approaches & Abutments

Stabilizes bearing soils and prevents structural displacement

Historic & Sensitive Structures

Provides non-invasive underpinning for preservation and protection

Infrastructure Foundations

Restores stability under roadways, utilities, and public assets

Residential Foundations

Restores bearing strength and corrects settlement beneath homes

Industries & Applications

Compaction grouting supports a wide range of markets and infrastructure systems, including:

Commercial & Industrial Facilities

Commercial & Industrial Facilities

Reinforces foundations supporting heavy equipment, production floors, and storage assets.

Municipal & Government Infrastructure

Municipal & Government Infrastructure

Restores bearing strength beneath public buildings, utilities, and transportation assets.

Water & Wastewater Infrastructure

Water & Wastewater Infrastructure

Provides foundation support for treatment facilities, lift stations, and containment structures.

Energy & Utility Infrastructure

Energy & Utility Infrastructure

Stabilizes soils beneath substations, pipelines, and tank foundations.

Transportation Infrastructure

Transportation Infrastructure

Strengthens bridge abutments, roadway subgrades, and retaining structures.

Bridge Infrastructure

Bridge Infrastructure

Restores foundation integrity for bridge piers, columns, and support structures.

How Our Process Works

1

Investigation

Foundation and soil conditions analyzed to determine depth and extent of settlement.

2

Planning

Injection design developed to reinforce bearing strata and correct alignment.

3

Access

Small injection ports installed adjacent to or beneath foundation elements.

4

Injection

Expanding polymers injected to compact and stabilize soils below the footing.

5

Monitoring

Pressure and movement tracked in real time for controlled lift and densification.

6

Validation

Post-treatment inspection confirms restored load-bearing capacity and stability.

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