How to Repair Cracks in a Concrete Foundation

Concrete is used to create foundation for various kinds of structures because it is a highly durable construction material. It is known for its sufficient bending resistance as well as superior tensile strength that gives it the ability to surpass driving and handling. However, it is still possible for this durable material to attain certain types of damages such as cracks. This kind of problem is easy to fix by learning how to repair cracks in a concrete foundation.

Materials Needed

For this kind of work, you need to prepare a trowel, a wire brush and a screwdriver. In addition, you have to get a polyurethane foam, siliconized latex concrete caulking and putty knife. To complete this job you must also prepare a sand and concrete mix.


Before repairing a crack, you need to assess the real nature of the problem first. To prevent serious problems later on, it is best to treat small cracks right away upon discovery. With this, you can also avoid water leakage. Excessively deep cracks usually have a diameter measuring more than a quarter of an inch. In terms of length, this kind of crack usually measures several feet long. It is good to seek the advice of professionals first before working on this.

If the crack is just small, get a screwdriver and then use it to chip away the excess concrete in the surrounding areas. This can help you penetrate the gap even more. Aside from this, be sure to remove fractured or weakened concrete. Get the wire brush and then remove all the loose dirt and sediment. Clean the fault line using hose and water. Allow the damage to dry up before you continue working.

When the cracked area is entirely dry, prepare to use the siliconized latex concrete caulking. Get the putty knife and use it to apply caulking right onto the crack. In case you have a caulking gun, it is easier and more convenient to use than the putty knife. Do not just cover the crack. Be sure to fill it with the solution until the entire length is covered. Flatten the compound on top with the help of a trowel. A smooth finish can be achieved by wiping off the excess caulking material.

Additional Tips and Other Helpful Information

For larger cracks, ordinary latex concrete filling is not enough to fix the problem, especially when water has already leaked into the basement. Instead, use a filling comprised of concrete and sand to achieve a better grip. Use polyurethane foam to ensure that the crack is waterproofed and sealed properly.

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