Our Process

We precisely level your concrete slabs using a patented pre-lifting process combined with structural polyurethane foam for substrate stabilization which can be used for a variety of applications. Structural polyurethane foam has been around for over 20 years, originally used to support airport runways and taxiways. Yea, it is that strong. Rated at 10,000 lbs. per square foot, the foam has been used in many industrial applications supporting heavy vehicles and equipment such as highway bridge approach slabs and railroad track slabs.

Our unique established procedure brings an exciting alternative to replacing defective concrete slabs on your property. It is hands down the best option for your concrete repairs. You’ll understand why we say, Why replace it? Correct it.

Concrete Raising Process

With HMI polyurethane, the HMI method for concrete raising utilizes the slab itself as a means of delivering raising, void filling, and stabilizing foam. A 5/8” hole is drilled through the slab into the subgrade. A tapered delivery port is then installed in the 5/8”hole. The injection gun, which delivers the dual component polyurethane material, is then connected to the port. Material is then injected through the port and slab. Expansion of the material occurs within seconds, compressing loose soils and raising concrete.

Raising concrete with polyurethane foam is done with incremental injections. Lifting foam will fully expand within 10-15 seconds. This allows the applicator to monitor the raise and prevents over raising the slab. HMI suggests using an air purged gun to deliver foam under the slab. This equipment will keep the injection port open between injections allowing for the installer to wait for foam to fully expand before injecting more material

Injection Gun

HMI patented FusionPro Front End has revolutionized concrete raising with foam. This patented design allows the applicator to install material into a delivery port multiple times. This eliminates the need for excessive hole drilling and saves time. The FusionPro is an easy conversion to the Fusion Gun. Merging mechanical and air purged technology, the FusionPro upgrade is the first ever gun upgrade designed for concrete raising.

Void Filling

Concrete settling is not the only issue that HMI Foam can solve. Voids under slabs are often present in areas where wash out or excessive settling can occur. This material will weigh on average 15-25 times less than a traditional mudjacking or cementitious group mix. This lightweight material will put less stress on an already failed subgrade. The process of drilling, port installation, and injecting the material is the same as the raising process. All dual component polyurethane foams create heat when installed. Void fills must be done in a layering method to allow heat to dissipate safely. HMI issues a Stewardship manual to all dual component polyurethane customers. This manual covers safety precautions that must be observed when injecting dual component polyurethane foams.

Joint/Slab Stabilization

Slab stabilization is often required when slabs lack support, but may or may not be settled. Slabs can crack when loads exceeding its capacity are applied . Slab/joint stabilization applications require the voids to be filled to eliminate movement and offer support.

HMI foam specifically designed for joint/slab stabilization has a very long reaction time and minimal expansion strength. It will take longer to expand allowing for better coverage under the slab or down a joint.

The process of raising concrete with HMI foam is inexpensive when compared to replacement. It is also exponentially faster than the replacement method. Repaired areas are ready within minutes to be utilized as they were intended to be. Ease of process material and clean up over advantages over traditional mudjacking repairs made with grout.