How to Fix Sinking Concrete: Step-by-Step Guide

Identifying Sinking Concrete

Identifying Sinking Concrete

Sinking concrete is an extremely common problem that homeowners face. If you live in an older home or in an area with poor soil conditions, your concrete surfaces are more likely to sink. Over time, the weight of your home and any structures around it can cause soil erosion, which can cause concrete surfaces to sink and crack. With this in mind, it’s important to know the signs of sinking concrete so that you can take action and fix it before the problem gets worse.

The first sign of sinking concrete is cracked or uneven surfaces. If you have concrete surfaces like driveways, walkways, or patios that are cracked or have uneven surfaces, it’s likely that your concrete is sinking. If you notice any cracks or unevenness, it’s important to inspect the area more closely to determine the extent of the damage.

Another sign of sinking concrete is pooling water. If you notice pools of water forming on your concrete surfaces, it’s likely that the concrete is sinking and causing water to pool. This can be a dangerous situation because these pools of water can cause slip and fall accidents.

If you notice any of these signs, it’s important to take action and fix the problem as soon as possible. Ignoring the issue can lead to further damage and more expensive repairs down the line.

In addition to the signs mentioned above, there are a few other signs that you can look out for. These include:

  • Cracks in your foundation
  • Doors or windows that stick or won’t close properly
  • Gaps between your walls or ceilings and the floor

If you notice any of these signs, it’s important to call a professional as soon as possible. A trained professional can inspect the area, determine the extent of the damage, and recommend the appropriate repair solutions.

Overall, identifying sinking concrete is the first step in fixing the problem. By understanding the signs of sinking concrete and taking action as soon as possible, you can prevent further damage and ensure the safety of your home and family.

Assessing the Damage

sinking concrete slab

If you’re dealing with sinking or settling concrete, it’s important to assess the level of damage before deciding on the best method of repair. First, identify the cause of the problem. Is it a result of poor soil compaction, faulty drainage, or simply the natural aging process of your concrete slab? Once you know what’s causing the problem, you can decide on the best course of action.

One way to assess the damage is to take a close look at the surface of your concrete. Are there any visible cracks or uneven areas? If so, these are indications that the damage may be more severe than you first thought.

Another method of assessing the damage is to use a level. Place the level on top of the concrete and check to see if it’s even. If one section of the concrete is lower than the others, it’s a sign that the slab has settled and needs to be repaired.

In addition to visual inspections and using a level, it’s also a good idea to monitor the area over a period of time to see if the problem is getting worse. If you notice that the concrete is sinking or settling further, it may be time to take action.

It’s important to note that while some small cracks and sections of unevenness may be purely cosmetic, larger cracks and more pronounced sinking may indicate a more serious issue. It’s always best to have a professional assess the damage before attempting to make any repairs yourself.

Overall, assessing the damage is an important step in the process of fixing sinking concrete. By identifying the cause of the problem and the level of damage, you can make an informed decision about the best way to proceed with repairs and ensure that your concrete remains safe and sturdy for years to come.

Choosing the Best Repair Method

Concrete Repair Methods

When it comes to fixing sinking concrete, there are several methods that can be used. Below are some of the most popular methods to consider.

1. Concrete Replacement: The most straightforward method to fix sinking concrete is to replace it. However, it is not always the most practical or cost-effective method. This method requires breaking up the affected slab, removing the old concrete, and pouring new concrete in its place. It is a time-consuming process, and it can also cause significant disruption to the surrounding area. Concrete replacement is typically only necessary for more severe cases of sinking concrete.

2. Mudjacking: Mudjacking, also known as slabjacking or pressure grouting, is a popular method used to fix sinking concrete. This process involves drilling small holes into the affected slab and pumping a slurry mixture of water, sand, and cement under the slab. The mixture fills any voids or spaces beneath the slab, and as it hardens, it lifts the slab back into place. Mudjacking is a more cost-effective method than concrete replacement, and it can be completed in a day or less.

3. Polyurethane Foam Injection: Polyurethane foam injection is a newer method of fixing sinking concrete that has become more popular in recent years. This method involves drilling small holes into the affected slab and injecting an expanding foam material beneath the slab. The foam spreads and hardens, fills any voids or spaces beneath the slab, and lifts the slab back into place. Polyurethane foam injection is a lightweight, fast, and effective method to fix sinking or settling concrete.

However, it is important to note that not all sinking concrete can be fixed with these methods. The severity of the sinkage, the cause of the problem, and the condition of the slab can all affect which method is best for your situation. It is always best to consult with a professional concrete repair contractor to help determine which method is the best fit for your specific needs.

Ultimately, the most important factor in choosing a repair method is ensuring that the problem is fixed correctly. Ignoring sinking or settling concrete can lead to a variety of problems, including uneven surfaces, tripping hazards, and even structural damage to buildings and other structures. If you suspect that you have a sinking concrete problem, it is essential to address it promptly to prevent further damage and expense.

Excavating and Lifting the Concrete

sinking concrete

If you notice that your patio, driveway, or other concrete slab is sinking, you might wonder how to fix the problem. Fortunately, there are ways to lift your sinking concrete back up to its original position. One of the most effective methods is to excavate and lift the concrete slab. Here’s what you need to know about how to execute this process.

First, you need to prepare the area before you start excavating and lifting the concrete. Clear the area and assess the extent of the damage. See if there are any other issues that need to be addressed, such as drainage problems, that could cause the same issue to happen again in the future.

Next, plan for excavation. You need to dig below the concrete so that you can access the soil that has caused the sinking. The depth you’ll need to dig will depend on how deep the soil has sunk and how large the affected area is.

Once you’ve finished excavating, it’s time to lift the concrete. There are two main ways to do this: using a hydraulic lift or a mudjacking process.

Hydraulic Lift

hydraulic lift

This method uses a hydraulic jack to lift the concrete back into place. Here are the basic steps.

Step 1: Drill Holes

drill holes

Drill holes into the concrete slab.

Step 2: Insert Steel Pipes

insert steel pipes

Insert steel pipes into the holes.

Step 3: Attach the Jack

attach the jack

Attach the hydraulic jack to the pipes and use it to lift the slab until it is level with the surrounding concrete.

Step 4: Seal the Holes

seal the drill holes hydraulic lift

Seal the drill holes with a crack sealer to prevent moisture from entering and eroding the soil beneath the slab again.



Mudjacking is another method that can be used to lift sunken concrete slabs. The mudjacking process involves pumping grout beneath the slab to fill the void caused by sinking soil.

Step 1: Drill Holes

drill holes

Like with the hydraulic lift method, you will need to drill holes through the concrete slab.

Step 2: Pump Grout

pumping grout mudjacking

Next, a grout mixture will be pumped beneath the concrete slab through the holes you drilled. The grout mixture is a combination of cement, sand, and water. As it is pumped under the concrete, it fills the voids and lifts the slab back into its original position.

Step 3: Seal the Holes

seal the drill holes mudjacking

This recovery process is also finished by sealing the holes.

After the concrete has been lifted back into place, it’s important to protect your driveway or patio by keeping it free of heavy equipment, cleaning off any oil stains, and sealing any cracks to prevent moisture from entering and creating new difficulties with sinking.

By following these steps, you can successfully execute an excavating and lifting process to fix your sinking concrete.

Sealing and Repouring the Area

sealing and repouring concrete

If the sinking concrete is caused by cracks and gaps, sealing the area can be a quick fix. First, remove any debris and loose concrete from the surface. Then, clean the area thoroughly with a pressure washer or a hard-bristled brush and a solution of water and detergent. Let the surface dry completely.

The next step is to fill the cracks and gaps with a concrete patching compound. This can be bought from any hardware store, and it usually comes in powder form that needs to be mixed with water. Follow the manufacturer’s instructions carefully for preparing and applying the compound.

Once the patching compound has dried, apply a concrete sealer to the entire surface. This will help to prevent water from seeping into the cracks and causing further damage. There are a variety of concrete sealers available, including clear sealers and colored sealers. Choose the one that best fits your needs.

If the sinking concrete cannot be remedied by sealing and patching, the next option is to repour the area. This is a more labor-intensive and expensive solution, but it will ensure a long-lasting and stable surface.

The first step in repouring the area is to remove the sinking or damaged concrete. This can be done with a jackhammer or a concrete saw. Be sure to wear protective gear, such as eyewear and gloves, when working with these tools.

Next, prepare the area for the new concrete. This involves removing any dirt and debris, leveling the surface, and installing a formwork to contain the concrete. The formwork can be made from wood, metal, or plastic, and it should be secured firmly in place before pouring the concrete.

Once the preparation is complete, it’s time to mix and pour the new concrete. This step requires some skill and knowledge, so if you’re not confident with your ability, it’s best to hire a professional. The concrete needs to be mixed to a uniform consistency, and it should be poured evenly into the formwork. Use a trowel to spread the concrete and remove any air pockets.

After the concrete has been poured, it needs to be cured. This involves keeping the surface damp and covered with a tarp or plastic sheet for several days. Curing allows the concrete to harden and reach its full strength. Once the curing period is over, remove the formwork and apply a concrete sealer to protect the surface from further damage.

Whether you choose to seal or repour your sinking concrete, it’s important to address the problem as soon as possible. Ignoring the issue will only lead to further damage and more costly repairs in the future. By taking action early, you can ensure a safe and stable surface for years to come.

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