Underslab Insulation
What is Concrete Underslab Insulation?
Concrete underslab insulation is a method where a special foam is injected beneath concrete slabs to improve their energy efficiency and stability. This process is especially useful for slabs that have sunk or settled, developed gaps, or even those without any issues. By injecting polyurethane foam under the slab, it provides great insulation, reducing heat loss and making the space more energy-efficient. It also helps stabilize the slab, preventing further sinking or damage. In short, concrete underslab insulation is a dependable solution that improves the performance and lifespan of concrete slabs and the areas above them.
The Underslab Insulating Process
When we insulate under your concrete slab, we start by drilling small holes in strategic locations. These holes ensure that we cover the area effectively. Our equipment, conveniently housed in a trailer, is equipped with a lengthy hose that can reach virtually any area in need of repair.
Next, we use a special foam system to fill the void under your slab. The type of foam we use depends on what your slab needs. If your slab has sunk or has gaps/voids, we use foam that lifts and fills voids. This foam expands to raise the slab and fills any empty spaces, while also providing insulation. This foam expands to raise the slab and fills any empty spaces, while also providing insulation.
But if your slab doesn’t have any gaps and just needs insulation, we use a different foam. This foam doesn’t expand much, so it won’t lift the slab. Instead, it spreads out evenly underneath, providing great insulation without raising the slab.
Our team knows all about these foams and which one to use for your situation. They make sure to pick the right foam for your slab, whether it needs lifting, filling voids, or just insulation. By using the right foam, we ensure that your under slab insulation project meets your slab’s specific needs and gives you the best results.
How Long Till You Can Use Your Slab?
Once we’ve finished injecting the foam, we patch up the holes with a strong patching material that closely matches your concrete’s color.
Sometimes, customers have broken areas of concrete or gaps between slabs that need filling. We’ll decide on the best material to use based on the size of the crack or gap during the estimate. Each product will have its own price.
Repairing a driveway or sidewalk usually takes 1-2 hours, depending on the size of the job. Garage floors, basement floors, and most interior floors may take a whole day if they’re larger and have hidden voids. Every job is unique.
After we’re done, your concrete slab is ready to use right away!
What Type of Concrete Can Benefit from Underslab Insulation Foam Injection Systems?
Underslab insulation foam injection systems can benefit various types of concrete slabs in both residential and commercial construction. Some of the common types of concrete slabs that can benefit from underslab insulation foam injection systems include:
Residential Slabs
Underslab insulation foam injection systems are commonly used in residential construction for insulating concrete slabs in homes. This includes both new construction and existing homes. It helps to improve energy efficiency, reduce heat loss, and prevent moisture intrusion.
Commercial Slabs
Underslab insulation foam injection systems are also used in commercial buildings, such as offices, retail stores, warehouses, and industrial facilities. Insulating the concrete slabs in these structures helps to provide better temperature control, reduce energy costs, and enhance occupant comfort.
Basement Slabs
In basements, underslab insulation foam injection systems can be used to insulate the concrete slab before finishing the space. This helps to prevent heat loss through the floor, reduce the potential for condensation and moisture-related problems, and create a more comfortable living environment.
Slabs with Radiant Heating
For concrete slabs that incorporate radiant heating systems, underslab insulation foam injection can enhance their efficiency. By minimizing heat loss through the slab, the radiant heating system can operate more effectively, providing better comfort and energy savings.
Garage Slabs
Insulating the concrete slabs in garages with underslab foam injection systems can help maintain a more stable temperature inside the garage, prevent heat loss, and reduce energy consumption. It can also help protect vehicles and stored items from extreme temperature fluctuations.
Slabs in Climate Zones
Underslab insulation foam injection systems are particularly beneficial in regions with extreme climate conditions, such as areas with cold winters or hot summers. By insulating the concrete slabs, these systems help to minimize heat transfer and maintain a more consistent indoor temperature, reducing the reliance on heating and cooling systems.
Shop Floor with Radiant Heat Lines – Before & After Polyurethane Concrete Lifting & Levelling in St. Adolphe, MB
See how we raised a settled radiant-heated shop floor using polyurethane foam injection, with careful mapping prior to drilling to protect the heating system within the slab.
Sidewalk to Front Entrance – Before & After Concrete Lifting in Amber Trails, Winnipeg
See how we raised and stabilized a sidewalk at a front entrance in Amber Trails, Winnipeg using polyurethane foam injection. View dramatic before and after photos—corrected settlement, improved winter safety, and restored safe, level access to the home.
Commercial Concrete Sidewalk Lifting – Before & After at Wok Box Entrance in Tuxedo Industrials, Winnipeg
Watch how our team eliminated trip hazards and stabilized fractured slabs for the high-traffic sidewalk at the Wok Box entrance in Tuxedo Industrials, Winnipeg, using advanced polyurethane concrete lifting techniques and custom reinforcement.
Concrete Lifting Driveway at Garage Approach – East Saint Paul, MB – Before & After
See how Slab-Jack Kings restored and leveled a settled driveway and garage approach in East Saint Paul, Manitoba. Our polyurethane foam concrete lifting, leveling and void fill service corrects uneven concrete and improves drainage—view dramatic before and after results!
Concrete Sidewalk Void Fill – Before & After at Silver Heights Condo, St. James, Winnipeg
Our expert team filled a large 5–6 inch void beneath a condo sidewalk in Silver Heights, St. James, Winnipeg using polyurethane foam injection—restoring stability, safety, and protecting the property for years to come.
Sidewalk Concrete Lifting – Before & After in Transcona, Winnipeg
See how our team raised and leveled a sunken sidewalk to the front entrance in Winnipeg by up to 4 inches. This dramatic before & after concrete lifting transformation eliminated trip hazards, restored safe access, and improved curb appeal for this residential home.
Slab-Jack Kings Reviews

Our small town had lots of supervisors when this truck, trailer and crew showed up. The guys were friendly and answered ALL of their questions. I wld recommend Slab Jack Kings to anyone needing a driveway lift.
Thanks to Tim also, showed up to measure and provide quote. All other companies were just asking for pics and provided estimates. Tim from Slab Jack Kings showed up...and that is worth alot right there.
Thx guys!
The Stinsons
Slab-Jack Kings helped me to pump for settling in 2020 which was four years ago.
This year, I contacted them and they told me that my situation is still covered by the warranty. Today they get the work done with quick and professional manner. I really appreciate to work with honest company like them. I will definitely ask help from they if there are something wrong with my basement again in the future.
For my project, foam jacking was the best option: it was faster, less invasive, and much cheaper than mud-jacking or replacing the whole slab.
I'd definitely recommend this company if you have a slab or sidewalk or something that's off kilter. Everyone I dealt with was excellent and all aspects of the project were clearly communicated.
Thanks!
Chris and Jeremy arrived on time, and were very professional. Chris verified the work with my husband Jeff before starting. They did a fantastic job of leveling our patio and sunroom pad, raising it over 3 inches in one area. Cleanup was exceptional, no mess left.
Would definitely recommend this company!
4 years ago: Chris did a good job setting expectations and advising me of the jacking process. He completed the job only about a month after the estimate, and at the quoted price.
I did a bit of research before going with foam jacking over mud jacking. A couple of the reasons I went with foam jacking were weight, strength and durability. I would recommend Slab Jack Kings.
Chris Lenchyshyn was a pleasure to deal with. Everything was as promised and happened so fast I did not even know they were here. I would recommend dealing with Chris and company. You will not be disappointed.
They advised us throughout the process of what would happen doing a lift of 7 inches. When the floor of our attached garage presented with some unforeseen circumstances, they advised us of the issues and presented options for us to choose from. The before and after photos were great to receive.
We would have no hesitation to refer our friends and family to Slab-Jack kings for the concrete lift jobs.
The work itself was great. I can hardly see the holes that were drilled to inject the urethane mix.
Finally after only three days, several of my neighbours have come by to look at the job and are interested in contacting this company for more information.
A fine family owned Manitoba company.
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Get Cozy This Winter with Slab-Jack Kings: Call Us Today!
In short, underslab insulation foam injection systems are perfect for various concrete slabs, from residential to commercial spaces, including basements, garages, and those with radiant heating. They offer numerous benefits like improved energy efficiency, less heat loss, moisture prevention, and enhanced comfort.
Don’t let winter’s chill ruin your personal space or inflate your heating bills. Slab-Jack Kings is here to help you turn your area into a warm haven while enjoying the energy-saving perks of underslab insulation. Our skilled team will ensure your comfort by creating a barrier against the cold, keeping your space cozy all winter long. Say goodbye to cold floors and hello to a more efficient solution with us. Trust Slab-Jack Kings for seamless installation and long-lasting protection against moisture, ensuring your space’s durability. Make this winter your coziest yet with Slab-Jack Kings. Reach out today to start your journey to a warm and comfortable retreat!


























