Noticing Concrete Sinking or Hollow Spots Underneath?
If your concrete is starting to sink, feel unstable, or sound hollow when you walk on it, there’s a good chance there are empty spaces underneath the surface. These hidden voids can weaken the support below your concrete and lead to uneven slabs, cracks, and long-term damage.
Void issues don’t fix themselves. As the empty space grows, the concrete above it continues to lose support, making the problem worse over time.
At Level Up Concrete Raising, we fill and stabilize these voids across the Denver Metro area by strengthening the base beneath your concrete—helping prevent further sinking and restoring support where it’s needed most.
What Causes Voids Under Concrete?
Voids form when the soil beneath your concrete shifts or washes away. This can happen for several reasons:
- Water erosion from poor drainage or runoff
- Soil settling over time
- Improper compaction during installation
- Freeze-thaw cycles common in Colorado
- Leaking pipes or excess moisture under the slab
As the soil moves or disappears, it leaves behind empty space that can no longer support the concrete above it.
Common Signs of Voids Under Concrete
Voids aren’t always visible right away, but there are clear signs to watch for:
- Concrete that sounds hollow when tapped
- Sinking or uneven slabs
- Cracks forming across the surface
- Areas that feel unstable underfoot
- Gaps forming beneath the edges of concrete
- Water pooling or draining under slabs
Catching these signs early can help prevent more serious structural issues.
Voids often affect more than just one area. If you’re seeing sinking concrete in multiple spots, it’s likely caused by the same underlying problem. Our team also provides concrete slab leveling, driveway leveling, and soil stabilization / deep foam injection. Addressing both the voids and the affected concrete helps create a more stable and long-lasting solution.
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What We Can Help With
- Sinking or uneven concrete
- Trip hazards around your home or business
- Water pooling and drainage issues
- Cracked or separated slabs
- Voids forming under concrete
Our Fix: Quick, Clean Void Filling
We use a proven process to fill empty spaces beneath your concrete and restore proper support.
1. Drill Small Access Holes
We drill small, precise holes into the affected concrete to access the void beneath the surface.
2. Fill with Expanding Foam
High-density polyurethane foam is injected into the empty space. It expands to fill the void, stabilize the surrounding soil, and support the slab above.
3. Patch & Clean Up
We seal the holes and clean the area. In most cases, the concrete is ready to use again shortly after the work is complete.
Why Property Owners Choose Void Filling
Filling voids is a key step in protecting your concrete and preventing further damage.
- Restores support beneath concrete slabs
- Helps stop ongoing sinking and settling
- Reduces risk of cracks and structural issues
- Improves overall stability of the surface
- Less invasive than major repair or replacement
Clean Work. Local Team. Reliable Results.
At Level Up Concrete Raising, we focus on doing the job right from start to finish. Whether we’re working at a home, a business, or a larger property, our goal is the same—deliver clean, professional results you can trust.
We show up on time, communicate clearly, and treat your property with care. Every project is handled with attention to detail, from the first drill hole to the final cleanup.
- Clean job sites and minimal disruption
- A+ BBB Rated and voted #1 in Denver
- Local team with fast, reliable service
- Clean work with minimal disruption — no mess left behind
- Honest recommendations — no pressure, no upselling
- Long-lasting results — ready to use right away
- Eco-friendly materials and methods
- Save thousands compared to full concrete replacement
No shortcuts. No guesswork. Just solid, reliable work you can feel confident about.
Get a Free Estimate for Void Filling
If you suspect there are voids under your concrete, we’re here to help.
Give us a call, or text
We’ll take a look and provide a clear, honest recommendation.
Void Filling FAQs
Voids can sometimes go unnoticed until the concrete starts to sink or crack. Common signs include hollow sounds when tapping the surface, visible gaps under the slab edges, or areas that feel weak or unstable when walked on. If you’re seeing these signs, it usually means the soil underneath has shifted or washed away, leaving the concrete without proper support.
If voids are left untreated, the concrete above them will continue to lose support and eventually begin to sink or crack further. Over time, this can lead to more serious structural problems and larger repair needs. Addressing voids early helps prevent the issue from spreading and keeps the surrounding concrete stable.
We drill small access holes into the concrete and inject expanding material beneath the surface. This material fills the empty space, compacts loose soil, and creates a stable base for the slab. You can learn more about the full process on our concrete leveling process page.
Void filling focuses on restoring support beneath the slab, while leveling involves lifting the concrete back into position. In many cases, both services are used together to fully fix the issue. Filling the void ensures the slab has proper support before or during the lifting process.
Yes, filling the void helps stabilize the area and reduce the chances of continued settlement. By restoring support beneath the slab, it prevents the concrete from dropping into empty space and helps maintain a more stable surface over time.
Most void filling projects can be completed in a few hours, depending on the size of the area and the extent of the voids. The process is efficient and designed to minimize disruption while still providing a long-term solution.
We drill small holes that are patched after the work is complete. These patches are typically minimal and blend in with the existing surface, making them far less noticeable than larger repair methods.
Yes, voids are often part of a larger soil issue that can impact multiple slabs across a property. That’s why it’s common to see similar problems in driveways, walkways, and interior floors at the same time.
Yes, we recommend being present so we can show you where the voids are likely forming and explain the best solution for your situation. This helps ensure you fully understand the condition of your concrete.
Need more information? Visit our full FAQ page for additional answers.
Proudly Serving the Denver Metro Area
At Level Up Concrete Raising, we provide concrete lifting and repair services across the Denver Metro area and surrounding communities. Whether you’re dealing with sinking concrete at your home or managing a larger commercial property, our team is ready to help.
We regularly work in cities like
- Arvada
- Aurora
- Berkley
- Brighton
- Broomfield
- Castle Pines
- Castle Rock
- Centennial
- Cherry Hills Village
- Columbine
- Commerce City
- Dacono
- Denver
- Edgewater
- Englewood
- Erie
- Federal Heights
- Firestone
- Frederick
- Glendale
- Golden
- Greenwood Village
- Highlands Ranch
- Johnstown
- Ken Caryl
- Lafayette
- Lakewood
- Littleton
- Longmont
- Louisville
- Loveland
- Northglenn
- Parker
- Roxborough Park
- Severance
- Sherrelwood
- Superior
- Thornton
- Todd Creek
- Welby
- Westminster
- Wheat Ridge
- Windsor
If you’re located anywhere in or around the Denver Metro, there’s a good chance we service your area.
Ready to fix your uneven concrete?
Clean, controlled process with minimal disruption
✉️ levelupconcreteraising@gmail.com
Voted #1 Concrete Leveling & Lifting Company in the Denver Metro Area
About Level Up Concrete Raising LLC
Level Up Concrete Raising LLC provides clean, precise concrete leveling across the Denver metro. We lift and stabilize sunken concrete using advanced foam injection for fast, long-lasting results.
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