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Voids Beneath Your Concrete? Fill Them Before Bigger Problems Develop


Voids beneath concrete slabs often go unnoticed until visible problems begin to appear. As soil washes away or settles beneath the concrete, empty spaces can develop that leave the slab unsupported. Over time, these voids can contribute to cracking, settlement, trip hazards, drainage issues, and even structural concerns.

At Jacksonville Contracting, we help Maryland property owners identify and fill voids beneath residential, commercial, and municipal concrete surfaces. By stabilizing the area beneath the slab, we can help prevent future settlement and protect the long-term integrity of the concrete above.

Why Do Voids Form Beneath Concrete?

Concrete is only as strong as the soil supporting it. When that support is compromised, empty spaces can develop beneath the slab and create future problems.

Common causes include:

  • Water erosion beneath the slab
  • Poorly compacted fill material
  • Soil settlement over time
  • Plumbing leaks beneath concrete
  • Stormwater runoff and drainage issues
  • Freeze-thaw cycles
  • Decaying organic material beneath the slab
  • Construction backfill settlement

The longer voids remain untreated, the greater the risk of concrete settlement and structural damage.

Voids often contribute to problems that require driveway repair, garage floor leveling, basement floor repair, foundation work, and soil stabilization.

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Family-Owned & 2nd Generation Company Serving Maryland Since 1973 Over 40 Years of Experience Polyurethane Lifting & Traditional Mudjacking Foundation Repair & Helical Pier Installation Compaction Grouting & Soil Stabilization Residential, Commercial & Municipal Expertise Licensed & Insured Financing Options Available

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Morby Morris
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Kevin and Family Onsite on time, explained to me everything and completed the job. Turned out Amazing.
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Jerry
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Very happy with results on my pool deck even my wife was happy which is not easy to do
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Shawn Holsinger
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Very easy to work with. Came out, got the quote to us quickly. Once we confirmed moving forward, were out doing the work within two weeks. The team used levels to ensure proper slope for good drainage. I would definitely recommend Jacksonville Contracting.
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Vilma ochoa
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We are about to do some hardscaping and improvements on our home but wanted to make sure our cracked and uneven patio was level. I contacted Jacksonville Contracting and Mitchell came out right away. Estimate was very fair. They were able to get us scheduled within our time frame and the guys were efficient,friendly,and did a great job.They found cracks that were 2-4” so thankfully i called them when I did. We would not hesitate to hire them again. Their prices are competitive and they are very professional!
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Kim Schwartz
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Found this company by accident and they did not disappoint. Prompt , very reasonable on price and professional! Would use them again and highly recommend to anyone who needs concrete work. For us it was adding concrete to existing pool deck that had settled over many years. Thanks Mitchell and team !!!
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Ken Mamaril
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We have a concrete front porch with several gaps from erosion that was sagging in places. Jacksonville contracting was able to fill the gaps and level off our front porch and sidewalk. They did a nice job and unlike a lot of other contractors cleaned up after themselves. They did all the work without any supervision from my wife or myself making the scheduling a dream! We couldn't be happier with the results and the service! Great job!
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David Drapinski
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Very professional, and the job turned out great.
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Linda Hawkins
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Great communication, outcome and price! Fabulous experience!
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B GT
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My insurance company cited my porch for being unsafe so I asked them for recommendations and they recommended Jacksonville Contracting. They were absolutely the best contractor I have worked with in a long time. Extremely quick responses to emails same day, fair pricing, always kind in explaining the good, bad and results to expect. The kindness of Mitchell Shinnick was beyond what I have ever received and I am so thankful I was referred to him! He was very empathetic as well. I wish he could take on other home improvement projects!
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Greenmount Station
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Did a great job and were professional from the first phone call until the completion of the job. Thank you! Chris
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Void Filling Contractor Maryland

Signs You May Have Voids Beneath Your Concrete

Many voids develop long before visible settlement occurs. Identifying the warning signs early can help prevent larger repairs later.

Common signs include:

  • Concrete beginning to sink or settle
  • Cracks developing in slabs
  • Hollow sounds when walking on concrete
  • Water pooling near slabs or structures
  • Uneven concrete surfaces
  • Soil washing out around concrete edges
  • Gaps forming beneath slabs
  • Settlement near foundations or retaining walls

If you notice any of these conditions, it may be time to have the area professionally evaluated.

Our Void Filling Process

Void filling helps restore support beneath concrete and stabilize the underlying soils before settlement becomes worse.

1. Drill Small Holes

Small, strategically placed holes are drilled through the concrete so we can access the voids and weak areas beneath the slab.

2. Pump & Stabilize

Mudjacking material or polyurethane foam is pumped beneath the concrete to fill voids, stabilize the base, and restore support.

3. Patch & Finish

Once the concrete is stabilized, the access holes are patched, the work area is cleaned, and most surfaces can be used the same day.

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Benefits Of Professional Void Filling

Filling voids before major settlement occurs can help protect both the concrete and the structures around it.

Benefits include:

  • Restores support beneath concrete slabs
  • Helps prevent future settlement
  • Reduces the risk of cracking
  • Protects foundations and structures
  • Improves long-term slab stability
  • Addresses washout and erosion issues
  • Helps eliminate trip hazards
  • More affordable than replacement
  • Minimizes disruption to the property
  • Extends the life of existing concrete
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Why Choose Jacksonville Contracting?

Since 1973, Jacksonville Contracting has helped Maryland property owners repair sinking concrete, foundation settlement, voids, and soil stability problems. As a family-owned, second-generation company, we bring proven experience to residential, commercial, and municipal projects.

  • Concrete Leveling Warranty
  • Family-Owned & 2nd Generation Operated
  • Serving Maryland Since 1973
  • Over 40 Years Of Experience
  • Polyurethane Lifting & Traditional Mudjacking
  • Foundation Repair & Helical Pier Installation
  • Compaction Grouting & Soil Stabilization Expertise
  • Residential, Commercial & Municipal Experience
  • 5-Year Warranty On Concrete Lifting
  • BBB A PlusLimited Lifetime Warranty On Helical Piers
  • 5-Star Google Rated Company
  • BBB A+ Rated
  • Licensed & Insured
  • Financing Options Available
  • Free Estimates
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Frequently Asked Questions

What is a concrete void?
A void is an empty space beneath a concrete slab caused by soil erosion, settlement, or washout. Without proper support, the slab can eventually crack or sink.
Yes. When soil support is lost beneath the slab, the concrete may begin sinking, cracking, or becoming uneven over time.
Jacksonville Contracting can fill voids using mudjacking materials or polyurethane foam depending on the project conditions and repair goals.
Void filling restores support beneath the slab and can significantly reduce the likelihood of additional settlement when performed before major damage occurs.
Yes. We provide commercial void filling services for warehouses, industrial facilities, parking lots, municipal projects, and other commercial applications.
Not exactly. Void filling focuses on filling empty spaces beneath concrete, while soil stabilization strengthens weak or unstable soils. Some projects may benefit from both services.
Yes. Voids and soil movement can contribute to foundation settlement and structural issues. If foundation movement is present, our foundation repair or helical pier installation services may be recommended.
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Serving Homeowners, Businesses &
Municipalities
Across Maryland

Jacksonville Contracting serves homeowners, businesses, and municipalities across Maryland with concrete lifting, mudjacking, polyurethane foam lifting, foundation repair, helical piers, void filling, soil stabilization, seawall repair, and structural repair solutions.

Whether you’re looking to eliminate trip hazards around your home, stabilize a commercial facility, or address complex foundation and ground settlement issues, our experienced team is ready to help.

Some of the Maryland communities we serve include:

Don’t See Your City Listed?
if you are located within approximately 60 miles of Baltimore, there’s a good chance we can help. Contact our team today to discuss your project and schedule a free estimate.

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