Signs of Voids Under Concrete Slabs
Sometimes, a void of deteriorated soil support under your concrete slab is noticeable. An empty, dark gap right beneath the edge of your concrete slab. It looks like the dirt simply evaporated. Sometimes you’ll spot these hollow areas around the perimeter of a garage floor, along a front porch step, or beneath a concrete patio. A visible void under a concrete slab is a flashing red warning light that structural failure is just around the corner.
Reasons Voids Occur
In Colorado, it usually boils down to three culprits:
Water Erosion: Poorly directed downspouts or heavy seasonal downpours wash away the loose subgrade soil from beneath the slab.
Soil Settlement & Compaction: If the dirt wasn’t properly compacted when your home was built, it will naturally sink and pull away from the concrete over time.
Critters: Pests, rodents, and rabbits love to burrow underneath concrete slabs because it provides a warm, predator-proof roof over their heads.
Whatever the cause, the result is the same: your heavy concrete slab is no longer supported by the earth. It is now suspended in areas.
The Problem With Voids Under Concrete
Concrete is incredibly strong under compression, but it has very little structural strength when it is left hanging. Think of your slab like a glass table—if you remove the legs underneath, it will snap.
Leaving a void unfilled means the next heavy vehicle, snow load, or even simple foot traffic could cause the concrete to crack, collapse, and drop into the hole. Once a slab cracks and caves in, repairing it becomes significantly more difficult and expensive. Furthermore, these open voids act as a superhighway for water, channeling future rainstorms directly toward your home’s foundation.
The Void Fill Solution
You don’t need to tear out the slab and start over, and shoving dirt or gravel into the gap with a shovel won’t fix it. You need foam void filling.
At Colorado Concrete Leveling, we fix this seamlessly using advanced, high-density polyurethane foam.
Complete Structural Support: We drill small, dime-sized holes into the slab and inject the foam. It expands rapidly, traveling into every hidden nook and cranny to completely fill the void.
Rock-Solid Base: The foam hardens into a lightweight, waterproof, and virtually indestructible material that fully supports the weight of the concrete and anything parked on top of it.
Erosion & Pest Proof: Our polyurethane foam won’t wash away in the next rainstorm, and animals can’t burrow through it.
Why Colorado Concrete Leveling is the Best Choice
We Stop the Drop: We can fill the void before your concrete cracks, saving you thousands of dollars in replacement costs.
Precision and Speed: Our process takes a fraction of the time of traditional mudjacking or concrete replacement, with zero destruction to your landscaping.
Eco-Friendly & Long-Lasting: Our foam is safe for Colorado soils and is engineered to last the lifetime of your concrete.
