Garage floors are notorious for experiencing extensive wear and tear due to their heavy-duty use. Everyday exposure to vehicle traffic, oil and chemical spills, and changing weather conditions can cause significant damage over time. Knowing how to repair common garage floor issues can help maintain your property’s value and usability. This article will guide you through common garage floor problems like cracks, pitting, and spalling, along with their potential solutions.

Recognizing the Problem

Before jumping into solutions, it’s crucial to correctly recognize and assess the issues at hand. Let’s look at the most common problems you may encounter with your garage floor.


Cracks in garage floors can develop due to a variety of reasons. These may include ground movement, heavy vehicle loads, or even poor construction. The appearance of the crack can tell you a lot about the underlying problem.


Small, deep holes in the concrete surface characterize pitting. It’s often a result of salt damage or exposure to harsh chemicals. If your floor has an overall rough appearance and texture due to numerous small pits, then it’s likely dealing with pitting.


Spalling refers to flaking or chipping of the concrete surface. This is often caused by freeze-thaw cycles where water seeps into the concrete, freezes, and then expands, causing the surface to chip or flake off.

Preparing for Repair

After identifying the problem, preparation is key for successful repair. This usually involves cleaning the area and purchasing the correct repair materials.


Ensure the area to be repaired is thoroughly clean and free from dirt, grease, and oil. You can use a high-quality degreaser or detergent for this purpose. For more stubborn stains, consider using a pressure washer.

Choosing the Right Materials

Depending on the damage, you might need different repair materials. Epoxy or polyurethane resins are commonly used for filling cracks, while a concrete resurfacer can handle pitting and minor spalling. For severe spalling, you might need to apply a new layer of concrete.

Dealing with Cracks

If not too severe, cracks are relatively easy to fix with the right approach and materials.

Assessing the Crack

First, determine the type of crack you are dealing with. Hairline cracks less than 1/8 inch wide may not pose serious structural concerns but can allow water and chemicals to penetrate the concrete, leading to further damage.

Larger structural cracks, on the other hand, may indicate serious issues with the concrete slab or the soil beneath it. If you’re dealing with these, consider consulting a professional.

Repairing the Crack

For hairline cracks, use a concrete or masonry crack repair product. These are typically liquid sealants that can be applied with a standard caulking gun.

For larger cracks, use a heavy-duty epoxy or polyurethane-based product. Before applying, you may need to widen and undercut the crack using a chisel and hammer to provide a good ‘key’ for the repair material.

Once the repair material is applied, be sure to smooth it out to blend with the rest of the floor.

Addressing Pitting

Pitting is a common issue in garage floors and can create an unsightly appearance. Here’s how to handle it:

Applying a Concrete Resurfacer

First, clean the area thoroughly. Then, prepare a batch of concrete resurfacer according to the manufacturer’s instructions.

Using a squeegee or trowel, apply the resurfacer to the pitted area. Smooth it out to blend with the rest of the floor.

Sealing the Floor

After the resurfacer has cured, consider applying a concrete sealer to the entire floor. This will offer additional protection against future pitting.

Managing Spalling

Spalling can be the most challenging to repair, especially if extensive. Here are the steps to manage it:

Removing Loose Concrete

Start using a hammer and chisel to remove loose or flaking concrete. Be sure to wear protective eyewear to prevent injury from flying debris.

Applying a Concrete Patch

For minor spalling, a concrete patch product can work. Just like with the pitting repair, clean the area, mix the patch material, and apply it with a trowel.

Laying New Concrete

For extensive spalling where large garage floor areas have been affected, it may be necessary to lay a new layer of concrete. This can be a complex job, and you might need professional help.

Final Thoughts

Addressing garage floor issues promptly can prevent further damage and potentially save you from a costly full-floor replacement. Remember to follow the manufacturer’s instructions when using repair products and consider professional assistance for severe damage or if you’re uncomfortable performing the repairs yourself.

Understanding the common problems garage floors face and how to repair them effectively will help you maintain a functional and aesthetically pleasing garage space.

Key Takeaways:

  • Garage floors often face issues such as cracks, pitting, and spalling due to heavy-duty use, vehicle exposure, oil and chemicals, and changing weather conditions.
  • Cracks in the garage floor can result from ground movement, heavy loads, or poor construction. Pitting is typically due to salt or chemical damage, while spalling is often caused by freeze-thaw cycles.
  • Before repairing, it’s crucial to clean the affected area and select the right materials. Epoxy or polyurethane resins fill cracks, while concrete resurfacers can address pitting and minor spalling.
  • For dealing with cracks, if they are hairline and less than 1/8 inch wide, a liquid sealant applied with a caulking gun can be used. For larger cracks, it might be necessary to use epoxy or polyurethane-based products, potentially requiring a professional’s assistance.
  • Pitting can be managed by applying a concrete resurfacer to the area after a thorough cleaning. Applying a concrete sealer to the whole floor after the resurfacer has cured can offer additional protection against future pitting.
  • Remove any loose or flaking concrete to manage spalling, then apply a concrete patch for minor spalling. For more severe spalling, you might need to lay a new layer of concrete, potentially requiring professional help.
  • Promptly addressing garage floor issues can prevent further damage and potentially save costs associated with a total floor replacement. Always follow the manufacturer’s instructions when using repair products and consider seeking professional help for complex or severe damage.