Concrete Crack Repair

Cracks in concrete can be repaired. There are different types of concrete cracks, some cracks need an entire restoration but others only need a filler to repair it.

 Cracks that have the width of a hairline or less need to be sealed with epoxy resin. In most cases cracks larger than 5mm wide will require crack repair.

 If the crack is on an exterior surface you should patch it immediately before water infiltration damages the substrate underneath.

How to Repair Cracked Concrete?

There are three main methods for repairing cracked concrete without replacing the whole slab:

  • Epoxy injection
  • Crack fillers
  • Concrete patching

Epoxy injection

Is a process where epoxy resin is forced into the crack using pressure. This method is typically used for cracks that are less than 1/5″ wide. Epoxy resin is a very strong adhesive and will seal the crack completely.

Concrete crack filler

This work for non structural crack. They are easily available in any hardware store near you. Involves caulking the filler into the crack to stop any future damage from occurring. This can also prevent further deterioration of concrete where it’s needed most – around corners and edges.

Concrete patching

Is a process where a mixture of sand and cement (concrete) is forced into the crack, creating a smooth surface on both sides of the concrete. 

Patching concrete can be done for hairline-sized cracks and also for larger defects on an exterior slab.

Once it has cured properly, the patch will have to be ground down until it matches the surrounding area exactly, sanded smooth, cleaned out thoroughly with water to remove any remaining sand particles, then patched with primer paint.


What Is The Best Way To Fix Cracked Concrete?

There are two methods for repairing cracked concrete. This slab replacement and patching

Slab replacement

Is the process of completely removing the old slab and replacing it with a new one. This is typically done when there is extensive damage to the surface.



Is the process of repairing the damaged area by filling it in with fresh concrete or sealant. This is typically done when the crack is smaller than 12mm wide.


Types Of Concrete Cracks

There are different types of concrete cracks, but we will focus more on the two main type of cracks that happens in any sort of building or development. They are structural and non-structural cracks.

A structural crack is a type of crack that usually occurs in the foundation or slab of a building and is indicative of a more serious problem.

The crack will be wider at the bottom than the top and may have a curved or angular shape. This type of crack is very common and should be repaired by a professional.

A non-structural crack is a type of crack that is not caused by any underlying structural problems, but rather by something like shrinkage or temperature changes. These types of cracks are typically hairline-sized and can be fixed through many DIY Guides.

Knowing the type of crack determines which repair and action you need to apply to avoid further damage to your concrete.

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