Soil Stabilization

Soil stabilization is the application of chemical grouting to modify the characteristics of soil for geotechnical or structural repairs.  Chemical grouting for soil stabilization is also referred to as soil modification, but is different than the use of chemical grouting for water intrusion repair.  We do not perform lime-based soil stabilization for cohesive soils.

How Soil Stabilization Works

Chemical grout is injected into soils in place, and reacts with native or introduced water to cure into a solidified mass.  A catalyst may be added to speed the reaction time.  Depending on the chemical grout being used, it may expand as part of the reaction process.  Non-cohesive soils are the best candidates for chemical grouting soil stabilization.  Layers of uncontrolled sandy fills commonly found under slab floors and slab foundations that are raised above finished grade are generally excellent candidates for chemical grouting soil stabilization.  Generally, soil stabilization is done on a grid pattern in conjunction with a shallow foundation repair method such as foam jacking.  This is a low-disruption alternative to deep foundation installation below slab floors.

Advantages of Soil Stabilization

Chemical soil stabilization is an excellent alternative to deep foundation repairs in the case of unconsolidated granular soils below concrete slabs and foundations.  Chemical grouting soil stabilization is generally paired with a shallow foundation repair such as foam jacking in the case of settlement. Compared to deep foundation repairs, chemical grout soil stabilization is:


Soil stabilization is performed with compact, electrically-powered equipment.  Dustless drilling is easily accomplished for interior applications, and mechanical connections in all components of the injection equipment ensure no loose material.

Less Disruptive

Compared to underpinning, soil stabilization is phenomenally less disruptive.  Typical deep foundation repairs require 8″ diameter holes drilled through floors, and large access pits dug next to foundations.  Deep soil stabilization only requires 1 5/8″ access holes drilled through floors and 3/8″ diameter injection pipes driven into the soil to be treated.


Soil stabilization is generally faster than underpinning repairs or other deep grout injection processes due to its compact equipment and ease of installation.  Because of its compact equipment, fast reaction times and minimal surface disruption, work can easily be scheduled and planned to accommodate an area’s or structure’s normal use.

Soil Stabilization Project Profiles