What Is Underpinning?

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 Whether you're building a new home or upgrading an existing structure, underpinning your foundation is an important part of the process. Depending on the nature of your soil, the method you choose will make a big impact on the strength of your foundation.

Underpinning is a great way to strengthen your foundation and raise the level of your home. Typically, the process involves excavating the soil below the existing foundation, filling it with concrete, and creating a new footing. In some cases, the footings can be underpinned with steel footings, concrete pads, or stumps.

In addition to strengthening your foundation, underpinning can help prevent the house from settling. This is particularly important if you're building a new home or adding a story to your existing home.

In order to determine the best underpinning method for your needs, it's best to speak with a professional. They will be able to give you a detailed plan of action and help you select the best method.

Traditional underpinning uses a series of pins to excavate the soil below the existing foundation. These are typically hot dipped galvanized steel square tubes. These tubes are driven into the earth at an angle. Once the soil is excavated, a large amount of it is disposed of on the working site.

Another type of underpinning uses grout or chemical injection. These chemicals change the chemical makeup of the soil and increase its strength. This can help to repair soils with low viscosity.

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