Types of Foundation Repair Methods

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9 September 2021 - 16:19, by , in PU Grouting, PU Injection, Comments off

You’ve spotted the signs, cracked walls and floors, leaky plumbing, and sticky doors. You know your foundation is in trouble and in need of repairs but what options do you have?

The type of repair you need 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’s concrete. Structural cracks are horizontal and caused by settling soil.

A consultation with foundation repair experts should identify the cause of the foundation problem and provide you with a recommendation on how to solve your particular situation. For now, here’s some information to help you get familiar with several types of foundation repair methods.

Foundation Repair Method #1: Sealants and Masonry Patches

Cracks in the foundation can sometimes be repaired by patching the crack and covering it with a waterproof masonry sealer. Spotting and repairing cracks early on is important because your foundation supports your 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

It’s better to identify the problem early on and repair it to prevent water infiltration and further damage.

diagram of how water and moisture levels affect foundation

NOTE: Foundation problems are common in Singapore because we have expansive soil which generally acts like a sponge. As soil absorbs water it swells and as it loses water it shrinks. This expansion and contraction movement causes your foundation to move and the pressure can cause it to crack. The best way to reduce foundation movement is through a preventative maintenance watering program.

Foundation Repair Method #2: Slab Jacking

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

Slab foundations 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 settling home foundation.

To lift the concrete foundation companies use the slab jacking method which 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 filling the void. As the solution expands the fallen slab is raised back into place.

An alternative method to slab jacking is n. Similar to the slab jacking process, polyurethane is injected through holes into the concrete to fill voids below. Instead of filling the space with natural elements, a dense and lightweight material is 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 and cause new soil compression beneath the slab. Because polyurethane injection is lighter, it tends to last longer but this process is not widely available.

illustration pointing at polyurethane injection points and foundation crack repairs

Foundation Repair Method #3: Piling

Concrete piers, pressed pilings, steel piers, and bell bottom piers are some examples of piling types used for 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.

Pressed Concrete Pilings

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

illustration of pressed concrete piers, stacks of concrete cylinders

Poured Concrete Piers

Poured concrete piers in residential repair are driven about 10ft. deep 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.

illustration of poured concrete pier before concrete is poured

Belled Concrete Piers

Bell bottom concrete piers are installed similar to poured/drilled concrete piers. The bottom of the pier has a bell shape “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.

illustration of belled concrete piers

Steel Piers

Steel piers are highly recommended as permanent foundation repair solutions. Steel piers are strong and able to be driven as deep as 100 feet providing incredible stability to your home’s foundation. The depth that 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.

illustration of several steel piers under a house

Helical Steel Piers

Also known as anchors, helical piers are commonly ideal for repairing lightweight concrete slab foundations and pier and beam foundations. In addition, to use in foundation repair, helical piers are also used to secure new foundations.

Helical piers are used when conditions prevent the use of other methods. These piers are threaded into the ground to a predetermined load capacity and the weight of the structure is transferred to the piers and thusly to the load-bearing soil.

illustration of steel helical piers under house foundation

As you can see there are lots of solutions available for foundation problems. Some solutions provide short-term relief and others offer a longer or even permanent fix. The options that are available for your foundation repair depend on a variety of factors. Consult with concrete foundation experts to learn what solution will work best for your home and your budget.

 

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