How to Repair Slab Foundation [7 Methods Used]

July 14, 2023

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Homeowners often find themselves wondering how to repair a slab foundation. Despite their durability, slab foundations might crack or otherwise suffer damage over time. Additionally, potential homebuyers might wonder if a house with a damaged foundation is worth buying!

Seven common repair slab foundation methods include:

  1. Foam jacking
  2. Sealants or patches
  3. Mud or slab jacking
  4. Steel or helical piers
  5. Concrete piers
  6. Waterproofing and added drainage
  7. Epoxy resins

Note that each method offers its own pros and cons. In turn, some added details about each can tell you which is right for your home. Also, you can discuss your options with a foundation crack repair contractor near you when needed. Their expertise ensures a strong foundation under your home!

how to repair slab foundation

How to Repair a Slab Foundation in Detail

Check out some added details about each slab foundation repair method. Additionally, remember that methods and costs change over the years. In turn, it’s vital that you contact a repair company for needed fixes around your property.

Foam jacking

Concrete slab foundation foam jacking, also known as slab lifting, raises and stabilizes sunken or uneven slabs. This process uses expanding polyurethane foam underneath the affected area. The foam expands, filling voids and raising the slab or floating it into position.

Foam jacking offers a less invasive and more cost-effective solution compared to other slab repairs. Additionally, foam jacking improves the structural integrity of concrete. It also helps prevent future damage including added settling or shifting.

Sealants or patches

A contractor applies concrete sealants to concrete surfaces. These create a barrier that prevents moisture from seeping into the concrete. Also, sealants add a barrier against chemicals, oil, or other damaging materials. Additionally, sealants reduce damage caused by concrete expanding and shrinking as it freezes and then dries.

Moreover, a contractor might apply patches over damaged concrete surfaces. These patches expand and fill cracks, holes, leaks. In turn, they help restore the structural integrity of the concrete. Additionally, a patch blends easily with surrounding concrete, providing a seamless repair.

Mud or slab jacking

Mud or slab jacking raises sunken or otherwise uneven concrete slabs. This process is often more affordable than homeowners realize! A contractor drills small holes along the affected area. Next, the contractor injects a specialized grout mixture.

The grout fills voids along the concrete surface and in the underlying soil. The grout also expands, floating the slab to its desired level. Lastly, the contractor patches the drilled holes and allows the repaired area to cure.

Steel or helical piers

A contractor can drive steel piers deep into the ground. This allows them to reach stable soil layers or bedrock. Once in place, the contractor transfers the structure’s weight onto the piers, stabilizing the foundation.

Helical piers resemble screws, and, in the same way, a contractor screws them into the ground. Their plates provide stability by holding the structure’s load and transferring it to the surrounding soil.

Both steel and helical piers counteract foundation settlement or movement caused by soil instability. They provide a durable solution, are resistant to corrosion, and support heavy loads. Also, a contractor can install them relatively quickly without extensive excavation or disruption. Additionally, they can install piers year-round, even in various weather conditions.

Concrete piers

Similar to steel and helical piers, a contract installs concrete piers under affected areas. This process starts with the contractor digging holes around the foundation and pouring concrete into the excavated areas. The piers then form in those excavated areas. They provide support and stability to the foundation, especially in areas with weak or compromised soil.

how to repair slab foundation

Waterproofing and added drainage

Adding needed waterproofing and drainage around a foundation is an excellent choice for addressing leaks. Waterproof membranes repel water and keep the foundation dry. Drainage solutions include French drains or sump pumps also keep water away from surrounding soil.

In many cases, contractors use waterproofing and drainage solutions in addition to other repair methods. For instance, they might offer slab jacking but recommend waterproofing after project completion. Combining these solutions keeps foundations dry and in good condition.

Epoxy resins

Epoxy resins aren’t just for jewelry making! These tough, durable resins offer an excellent, affordable solution for some concrete slab foundation repair needs. To use these materials, a contractor first prepares and cleans the damaged area.

Next, the contractor injects the resin into the cracks using specialized tools or injection ports. The epoxy fills the cracks, seeping into the surrounding areas. As it dries, it provides a strong bond while restoring structural integrity.

Can You Rebuild on a Slab Foundation?

In many cases, a property owner can rebuild on a slab foundation. First, you would need an evaluation of the existing slab. Damaged, cracked, or structurally compromised slabs need repair before rebuilding.

Second, take into account the design and layout of the new structure. The slab’s dimensions and load-bearing capacity should determine the new building’s design.

Also, remember to abide by local building codes! These include requirements for structural stability, insulation, moisture protection, and other factors. Some areas might not even allow new structures over all slabs. Additionally, compare the price of a new slab as it might be less expensive than you assume!

Lastly, remember that even the toughest foundation breaks down over time. In turn, you shouldn’t treat an old slab as if it offers the same strength as newly poured concrete. Consider underpinning, slab jacking, or other methods or strengthening that foundation. A small investment in its stability can mean avoiding long-term damage and otherwise unnecessary repair bills.

A Word From Our Crew

Lexington Foundation Repair Experts is happy to help explain how to repair a slab foundation. Hopefully we’ve answered the question for you! Also, if you’re in the area, call our Lexington foundation repair contractors. We offer FREE quotes and guaranteed fixes. Additionally, we provide a range of services including repairs, waterproofing, and more. For your no-cost quote and consultation, reach out to our customer care team today.


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