How to Deal With Voids Under Concrete Slabs After Mudjacking

Has your concrete slab settled and required mudjacking? 

While mudjacking is an effective solution to lift sunken concrete, it’s crucial to ensure the job is done correctly. One potential issue to watch for is the presence of voids under the slab, even after the mudjacking process.

This article will guide you on:

• Identifying signs of voids under your concrete slab.
• Understanding why voids might occur after mudjacking.
• Knowing what to do if you suspect voids.

If you’ve recently had your concrete slab mudjacked, pay close attention to the information below to ensure the longevity and stability of your concrete surfaces.

How Does Mudjacking Help Get Rid of Voids Under Concrete Slabs

Mudjacking is a technique used to repair sunken concrete slabs by injecting a slurry mixture beneath them. This mixture, typically composed of water, soil, and cement, fills the voids that have caused the slab to sink. As the mixture hardens, it creates a solid support base, effectively lifting the slab back to its original level.

Why Mudjacking Works 

Mudjacking effectively addresses voids under concrete slabs because it directly targets the root cause of the problem. By filling the empty spaces with a strong, supportive material, the slab is stabilized and prevented from further settling. This not only restores the level of the concrete but also enhances its structural integrity.

Identifying Voids Under Your Concrete After Mudjacking

While mudjacking is designed to eliminate voids and stabilize concrete slabs, it’s crucial to be vigilant and identify any potential concrete problems after the process. Here are some key signs that might indicate the presence of voids:

1. Uneven Surfaces:

• Visible Dips or Bumps: If you notice areas where the concrete is noticeably lower or higher than the surrounding surface, it could be a sign of underlying voids.
• Trip Hazards: Uneven surfaces can create tripping hazards, especially for children and the elderly.  

2. Soft Spots:

• Spongy or Giving Feeling: If you can press down on the concrete and feel a soft or spongy area, it’s a strong indicator of a void beneath.
• Sounding Hollow: Tap on the concrete surface. A hollow sound might suggest the presence of a void.

3. Cracking:

• New Cracks Appearing: Voids can put stress on the concrete, potentially leading to the formation of new cracks or the widening of existing ones.  
• Cracks Radiating from a Point: If cracks appear to originate from a specific spot, it might be an area where a void exists.

4. Settling:

• Re-sinking of Concrete: If the concrete starts to sink again after mudjacking, it’s a clear indication that the initial repair was unsuccessful and voids might still be present.

Understanding Why Voids May Occur Under Your Concrete Slab Even After Mudjacking

Voids under concrete slabs after mudjacking can occur due to several factors, even though the process is designed to eliminate them:

1. Incomplete Void Filling:

• Inadequate Slurry Volume: If the mudjacking contractor doesn’t inject enough slurry mixture, it may not completely fill all the existing voids. This can leave pockets of empty space, which can lead to future settling.
• Uneven Slurry Distribution: If the slurry isn’t evenly distributed under the slab, certain areas might receive insufficient support, potentially leading to localized voids.

2. Soil Movement:

• Shifting Soil: Even after mudjacking, the underlying soil can still shift due to factors like freeze-thaw cycles, heavy rainfall, or changes in groundwater levels. This movement can create new voids or reopen previously filled ones.
• Erosion: Water can erode the soil beneath the slab, especially in areas with poor drainage. This erosion can create voids and undermine the support provided by the mudjacking.  

3. Improper Mudjacking Technique:

• Insufficient Pressure: If the slurry isn’t injected with enough pressure, it may not penetrate deep enough into the voids, leaving them partially filled.
• Inadequate Curing: If the mudjacking mixture doesn’t cure properly, it may not develop the necessary strength to provide long-term support for the slab.

4. Underlying Issues:

• Tree Roots: Tree roots can grow and expand under the slab, exerting pressure and potentially creating voids.  
• Burrowing Animals: Animals like moles or gophers can burrow under the slab, creating tunnels and undermining its support.  

It’s important to note that while voids can occur after mudjacking, they are not always inevitable. By working with a reputable contractor who uses proper techniques and quality materials, you can significantly reduce the risk of encountering voids and ensure the long-term stability of your concrete slab.

Here’s What You Can Do When You Find Voids Under Your Concrete Even After a Mudjacking Job

If you find voids under your concrete slab even after mudjacking, it’s crucial to take prompt action to address the issue and prevent further damage. Here are the steps you should take:

1. Reach out to The Mudjacking Contractor: You need professional experts to help get your concrete slab void-free again and the Mudjacking Contractor is the exact company that will help you get it. 
2. Schedule an Inspection: Request a thorough inspection of the affected areas. The Mudjacking Contractor team will assess the situation and determine the cause of the voids.  
3. Discuss Repair Options: Based on their findings, the contractor will recommend appropriate repair solutions. These may include:
   • Additional Mudjacking: If the voids are relatively small, additional mudjacking may be sufficient to fill them and stabilize the concrete.
   • Void Filling with Polyurethane Foam: Polyurethane foam is a lightweight, expanding material that can effectively fill voids and provide strong support. It’s often a preferred alternative to mudjacking for certain situations.  
   • Other Repair Techniques: Depending on the severity of the issue, other repair techniques may be necessary, such as slab replacement or foundation stabilization.
4. Obtain a Written Estimate: Before proceeding with any repairs, obtain a written estimate from the contractor detailing the proposed work, materials, and costs.  
5. Address Underlying Issues: In some cases, the voids may be caused by underlying issues such as tree roots, soil erosion, or animal burrows. If this is the case, it’s important to address these issues to prevent future problems.
6. Monitor the Situation: After the repairs are completed, continue to monitor the concrete slab for any signs of settling or other issues. If you notice any problems, contact The Mudjacking Contractor immediately.

Conclusion 

Discovering voids under your concrete slab, even after mudjacking, can be a frustrating experience. However, it’s crucial to remember that addressing the issue promptly is essential to prevent further damage and ensure the long-term stability of your property.

Homeowners in Long Island, Queens, Suffolk, and Nassau, with their unique geological and climatic conditions, are particularly susceptible to soil movement and foundation issues. Therefore, it’s crucial to rely on experienced professionals like the Mudjacking Contractor. Their expertise in dealing with these challenges, coupled with their in-depth knowledge of the local conditions, ensures that the repairs are carried out effectively and efficiently.

Call the Mudjacking Contractor today or visit their website for a FREE estimate.