Void Filling in North Texas
Fill Hidden Voids • Stabilize Weak Soil • Stop Settlement • Protect Your Concrete
Voids under concrete form when the supporting soil washes out, collapses, or shifts. These empty pockets cause slabs to sink, crack, or become unstable — and the problem only grows with time. PolyFix Inc. fills underground voids using high-density polyurethane foam, restoring solid ground support and preventing future settling without tearing out your concrete.
Why Voids Form Under Concrete
Voids are extremely common in North Texas due to soil movement and water-related erosion. The most common causes include:
- Shrinking and swelling clay soil
- Water runoff washing away soil
- Plumbing or drainage leaks
- Settlement from poor soil compaction
- Burrowing animals beneath slabs
- Heavy rain creating washout tunnels
- Soil collapsing under heavy loads
- Groundwater shifts near foundations and pools
Once a void forms, the slab above it loses support and begins to dip or crack.
Common Signs You Need Void Filling
You may have voids under your concrete if you notice:
- Hollow or “empty” sounds when walking across slabs
- Visible gaps under concrete edges
- Slabs rocking or moving when stepped on
- Sudden dips, cracks, or uneven sections
- Soil disappearing near porches or patios
- Washout areas forming after heavy rain
- Driveway or walkway sections sinking in one spot
- Slabs pulling away from steps, walls, or pool edges
Voids grow quickly and lead to bigger structural problems if left untreated.
If you have voids forming under your concrete, nearby areas like your driveway, walkways, or porch may also be at risk of settling. We also handle concrete repair and slab leveling if your concrete has already shifted.
