Foundation Repair Techniques and Methods

What Is Foundation Repair | 8 Types of House Foundation Repair Methods | How to Fix Foundation11 min read

What Is Foundation Repair?

Your home is a big investment. It is important to make sure that it is well maintained. When the foundation of the house is damaged will show up around the structure and then we have to implement House Foundation Repair. All foundations will settle with time, but problems arise when this settlement is uneven or extreme.

When you look around your home and found some of these signs, it is proof that the structure may have foundation problems. Foundation problems need proper care before serve damage occurs. As a solution to this problem their different Foundation Repair Methods are available.

Signs of Foundation Problem

Following are some warning sign which indicates the foundation problem and necessity of applying house foundation repair method,

Exterior Warning Signs

  • Wall rotation
  • Separation around garage door, window, or walls
  • Cracked bricks
  • Broken or cracked foundation
  • Displaced moldings

Interior Warning Signs

  • Misaligned doors and windows
  • Cracked sheetrock
  • Cracks in floor
  • Uneven floors

The soil type in certain areas of the country leads to a higher rate of foundation trouble. Areas with high clay content and coastal areas with lots of sand tend to see more damages in the foundation. Homes in these regions are more affected and at greater risk for foundation damage.

When unstable soils are used as a base for a foundation like sandy soil or expansive clay, the movement is transferred to the foundation. Where soil movement is rarely uniform, the foundation is subjected to a differential or upheaval. The problems show up in both slab and pier in beam-type foundations.

The types of foundation repair methods you required for the foundation will depend on the soil type, climate, foundation build, and any additional outstanding problems. Non-structural cracks in foundations are often vertical or diagonal, these are cracks caused by expansion and contraction of the foundation concrete.

Structural cracks are horizontal and caused by setting soil. Fifty percent of all homes built on expansive soils suffer from foundation distress. The trouble occurs when only part of the foundation heaves or settles, causing cracks and other damages.

Read More: What Is The Strongest Foundation For A House

Causes of Foundation Problem

For the vast majority of the damage, water is the primary culprit. Fluctuations in the moisture content of foundation soils may lead to components of the soil swell or shrink, leading to movement beneath your foundation.

Your property may be more susceptible to foundation damages if:

  • It was built on expansive clay.
  • It was built on unstable & improperly compacted fill soils.
  • The area around the foundation has poor drainage or water logging problems in areas.
  • The structure is a built-in area with extreme seasonal changes.
  • You experienced a plumbing leak below your home.
  • Tree roots are growing too close to your home.
  • An earthquake, flood, or drought comprised the structure.

So, how to fix foundation? the following are some best methods of foundation which are most commonly used in the United States.

House Foundation Repair Methods

Ther Following are best house foundation repair techniques,

1. Sealants and Masonry Patches

foundation repair techniques
Crack in Foundation

Cracks and patches in the foundation of a structure can be repaired by patching the crack and covering it with a waterproof masonry sealer. Spotting and repairing cracks early on is important because of our foundation supports the entire house.

Commonly used sealers for minor cracks include hydraulic cement, vinyl concrete, epoxies, silicone, or polyurethane. The type of mixture used will depend on the severity of the crack. This is an important house foundation repair methods.

The minor or negligible cracks can be treated with masonry patches or sealants but a regular maintenance is encouraged.

Chipping the crack and doing masonry patches using sealers is only favorable with minor cracks. It is better to identify the problem early on and repair it to prevent water infiltration and further damage to the foundation.

2. MudJacking

Mudjacking is a repair method used to lift concrete that is uneven or sinking. This process is also known as Slab jacking, concrete lifting, and slab leveling. This method is ideal for small jobs such as raising porches, steps, decks, walkways, garage floors, and driveways.

Slab foundation sink or tilt when the soil underneath shifts or collapses and leaves empty spaces below. Professionals have access to the equipment and knowledge of local soil conditions to repair a setting home foundation.

foundation repair techniques

In the slab jacking method, to lift the concrete foundation, it consists of drilling 2 holes through the concrete foundation and into the sunken spaces below. A solution of natural elements (soil, cement, etc.) is injected through the hole to filling the void. As the solution expands the fallen slab is raised back into place.

An alternative method, the slab jacking is polyurethane injection. Similar to the slab jacking process, polyurethane is injected through holes into the concrete to fill the voids below. Instead of filling the space with natural elements, dense and lightweight materials are used.

These two slab lifting methods serve the same function and work well on smaller projects. However, both are short-term fixes that may need to be repeated every few years. Injected materials are heavy cause new soil compression beneath the slab. Because polyurethane injection is lighter, it tends to last longer but this process is not widely available.

Advantages of Mudjacking

  • When comparing to replace the whole structure, the cost of slab jacking is low.
  • The place where slab jacking has been done can be used in about one hour.
  • This method is suitable for any condition of weather.
  • No color change in the structure as the new concrete mixture spread beneath the old slab layer.
  • Doesn’t need to clean up the place as this method never messes up the place when compared to the rest.

Read More: Floating Foundation – Principles, Construction Steps

3. Piering or Piling

foundation repair techniques
Piering or Piling Technique

The piering or piling technique can be guessed from its name. A steel or concrete pier is used to resettle the foundation. But there is a minor difference between piering and piling house foundation repair method. Piering can be done by the excavation of earth strata while piling can be done by driven piles into the ground.

Concrete piers, steel pressed piling and bell-bottom piers are some examples of piling used for house foundation repairs. These methods are long-term solutions to foundation problems and do a better job of returning your home’s foundation to its original level than slab jacking.

a) Steel Pressed Piling

foundation repair techniques
Steel Pressed Piling

Steel pressed pilings are highly recommended as permanent house foundation repair solutions. Steel piers are strong and able to be driven as deep as 100 feet providing stability to your home’s foundation. The depth up to which steel piers are able to reach means that the piers will not move in expansive clay soil because the piers should be driven down to bedrock.

Advantages of Steel Pressed Piling

  • The steel piers can press deeply into the soil and give a firm attachment to the soil.
  • The installation cost of the piers is low.
  • Steel piers can withstand for heavyweights when compared to concrete piers.

b) Helical Steel Piers

  • It is also known as anchors, helical steel piers are commonly ideal for repairing lightweight concrete slab foundations and pier and beam foundations. Helical piers are also used to install new foundations. Helical piers are used when conditions prevent the use of other methods.
  • These piers are threaded into the ground to predetermined load capacity and the weight of the structure is transferred to the piers and thusly to the load-bearing soil.

c) Concrete Pressed Piling

Pressed concrete pilings are more durable foundation piers used for interior and exterior repairs of foundation. They work more effectively on pier and beam houses as well as concrete slab foundations. Properly installed pressed concrete piers need to be driven into the ground to achieve stability; typically this is about 12 feet deep.

Drill holes on the structure which is in repair to a deep depth. Then fill the hole with reinforcement and concrete. Sometimes precast concrete piles are used, which never use any reinforcement.

Advantages of Concrete Pressed Piling

  • The cost is low, with no heavy equipment needed.
  • Not much tactical as the slab jacking method.

d) Poured Concrete Piers

foundation repair techniques
Poured Concrete Pier

In this type of foundation repair method, concrete piers in residential repair are driven about 10 feet and take about 7 to 10 days for the foundation leveling to cure. Installation time for poured concrete piers is longer than it is for pressed concrete pilings because the latter method uses precast concrete segments that are already cured at the time of installation.

e) Belled Concrete Piers:

Bell bottom concrete piers are installed similar to poured/drilled concrete piers and same process followed as above. The bottom of the pier has a shape of the foot that is designed to provide a wide area of support to the pier. Like poured concrete piers, bell bottom piers are built by pouring concrete into an excavated hole and placing steel into the wet concrete.

Advantages of Belled Concrete Piers:

  • Give good strength as it is reinforced.
  • The shape of the bottom prevents the piers from unwanted movements within the soil layer.

4) Soil Modification in Foundation

foundation repair techniques
Soil Modification in Foundation

Soil modification or soil stabilizing is the process to make the soil stiffer and stable that the previous. Here, voids within the soil layers are filled by some chemicals. The process is somewhat likely to the slab jacking. Many users hardly recommended this method as it needs more knowledge and well trained guide. Also cost of work and maintenance is high.

Advantages of Soil Modification

This type of house foundation repair methods, the Soil modification is fast response, long-lasting, less damage to the structure, and also environmentally friendly method.

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