Specialty Contractor

Experts for Complex Geohazard Projects

GeoStabilization International is the nation’s leading specialty contractor focused exclusively on geotechnical stabilization and geohazard mitigation. When conventional construction methods fall short, our design-build teams deliver engineered solutions for rockfall, slope instability, erosion, and foundation challenges. With quick response, proprietary equipment, and two decades of proven expertise, GSI partners with general contractors, DOTs, and engineering firms to stabilize the most difficult sites.

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Construction on river.
Soil Nail Launcher installing nails on a roadside slope.

Why Choose GSI

  • Design-Build Delivery: Integrated engineering and construction ensure seamless coordination from start to finish. 
  • Quick Response: Nationwide crews mobilize rapidly to address critical geotechnical issues. 
  • Proven Expertise: Specialized in high-risk, steep-slope, and limited-access environments. 
  • Innovative Technologies: Exclusive systems like SuperNails™ and advanced soil nail walls. 
  • Safety and Quality: Industry-leading safety performance backed by rigorous field standards.
  • Trusted Collaboration: Supporting general contractors, engineers, and owners on infrastructure projects across North America.
Soil Nail Installation at Gardiner Road

Our Specialty Capabilities

  • Rockfall Mitigation: Design-build solutions to contain, deflect, or stabilize rock slopes. 
  • Slope and Landslide Stabilization: Permanent repairs using soil nails, rock bolts, shotcrete, and drainage systems. 
  • Retaining Wall Construction and Repair: Engineered walls for roadway, commercial, and utility projects. 
  • Foundation Support Systems: Micropiles, anchors, and underpinning for unstable or variable ground. 
  • Erosion and Drainage Control: Long-term surface and subsurface water management. 
  • Bridge and Embankment Stabilization: Reinforcement for critical transportation and energy corridors.
  • Remote and Difficult-Access Repairs: Specialized rigs and rope-access crews for steep or sensitive terrain.
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Our Proven Process for Project Delivery

1

Assessment

Our engineers conduct rapid, no-cost site assessments to evaluate conditions and risks.

2

Design-Build Engineering

We design custom stabilization systems tailored to your site’s geology, loads, and operational needs.

3

Construction & Access

Specialized equipment allows safe construction on steep, restricted, or unstable terrain.

4

Verification & Monitoring

Comprehensive inspection and quality control ensure every repair meets design intent and long-term performance standards.

The GSI Advantage

  • Speed: Quick response and nationwide mobilization for urgent and planned stabilization needs.
  • Certainty: Single-source design-build delivery that reduces risk and ensures accountability.
  • Safety: A culture of continuous training and jobsite vigilance.
  • Experience: Thousands of successful specialty construction projects across every terrain and climate.
  • Reliability: The trusted specialty contractor for general contractors, DOTs, and engineering firms nationwide.
Wire Mesh Install

Client Reviews

Foundation Grouting and Structural Repair for Homeowner

I wanted to drop you a quick note. Late last year I had Tom Szynakiewicz come by and advise me as to what I needed to do to fix my house structure. Tom and GSI were great to work with to find a solution for my structure issues. GSI did an excellent job for us and got us on the right track with the work that was performed. We just sold the home last week, and disclosed the work that was done. We had zero issues with selling the home because it was fixed by GSI. I am very thankful I called and got you guys involved! Thanks again for steering me in the right direction Wayne!

Emergency Landslide Repair in Wyoming

In 2017, another well above normal snowpack winter and heavy spring rains resulted in 23 new landslides, which damaged or threatened WYDOT roads. WYDOT turned to GSI to help respond to these emergency situations. GSI was able to respond very quickly and in most cases had personnel on site to assess the site within 24 hours. They would provide a proposal for remediation with a preliminary design and estimated costs within 48 hours in most cases. During 2017, GSI was selected to perform remediation with contracts at six separate sites. In all cases, they were prepared to mobilize to the sites and begin work within a week of being given notice to proceed.

A unique element of these emergency contracts was a partnership, between WYDOT and GSI, by which WYDOT provided some logistical support such as traffic control and providing water for drilling operations so that GSI could focus its efforts on performing the specialty work. This arrangement resulted in cost effective, efficient, successful projects. When responding to emergency landslide repair, time truly is money, the sooner a landslide can be remediated before it has a chance to grow, the less expensive it is to repair. In the past, WYDOT has experienced situations in which, landslides could possibly have been remediated quicker, experienced further failure during drawn out conventional design and contracting methods resulting in higher costs due to the additional failure. GSI uses various types of innovative geo-technology in their landslide remediation projects….

All of these projects were completed on schedule, even with cold weather conditions and snow storms ….

All of the stabilization projects that GSI completed for WYDOT included a warranty to repair any of the remediation that would happen to fail, but to date none of the work that they have performed has required any repair. I would highly recommend GeoStabilization International to perform emergency landslide and slope remediation work. They have the resources, personnel, and expertise to respond to your emergency in a timely, professional manner.

Retaining Wall Repair in Pennsylvania

I would like to take this opportunity to express my appreciation for the expert design and construction work performed by your company on our [Retaining Wall Project]. On the design side, I was truly impressed by how quickly and efficiently you and the other engineers responded to the need to revise the original design due to conflicts that arose with many of the proposed soil nails and the locations of the existing underground utilities. The problem was recognized on a Friday and the project was redesigned, new calculations performed, and revised design plans prepared before the weekend expired. Obviously, you and others worked through the weekend to keep the job moving forward and on schedule. Thanks to you and your firm for the professional and courteous performance of both the design and construction work. I would not hesitate to recommend your firm to anyone who may have a need for the specialized types of services that your company is not only capable, but expert in performing.

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Contact Us Today

When your project demands advanced geotechnical expertise, GeoStabilization International delivers engineered certainty under pressure. Our specialty teams are ready to assess your site and provide a customized, design-build solution that ensures long-term stability and safety.

Request a site assessment or proposal today.

855.579.0536

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