A cracked garage floor is more than just an eyesore. Over time, cracks can widen, collect moisture, weaken the concrete, and even damage vehicles or equipment. Because garages handle heavy loads, temperature changes, oil spills, and constant traffic, concrete floors are especially vulnerable to cracking.
At Crown Coatings, we specialize in garage floor repair, epoxy flooring, polyaspartic coatings, and polished concrete solutions designed to restore strength, appearance, and durability. In this guide, we’ll explain why garage floors crack, how to repair different types of cracks, and when professional repair is the smartest option.
Why Do Garage Floors Crack?
Understanding the cause of the crack is essential before attempting any repair.
1. Heavy Vehicle Load
Garages support cars, trucks, motorcycles, and sometimes commercial vehicles. Over time, repeated stress can cause concrete to crack.
2. Temperature Fluctuations
In regions like Vancouver and the Lower Mainland, seasonal temperature changes cause concrete to expand and contract, leading to cracking.
3. Moisture Penetration
Water entering through small cracks can freeze, expand, and worsen damage. Moisture also weakens concrete internally.
4. Soil Settlement
If the ground beneath the garage slab shifts or wasn’t compacted properly, the concrete above can crack.
5. Poor Installation
Inadequate reinforcement, missing control joints, or improper curing during installation significantly increase the risk of cracks.
Types of Garage Floor Cracks
Not all garage floor cracks are the same. Identifying the type helps determine the correct repair approach.
Hairline Cracks
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Very thin and shallow
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Mostly cosmetic
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Common in new garages
Shrinkage Cracks
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Occur during curing
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Irregular pattern
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Typically non-structural
Settlement Cracks
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Caused by soil movement
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May widen over time
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Need close monitoring
Structural Cracks
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Wide, deep, or uneven
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May indicate slab movement
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Require professional repair
How to Repair Small Cracks in a Garage Floor
Minor cracks can often be repaired with DIY methods if addressed early.
Step 1: Clean the Crack
Remove all dirt, dust, oil, and debris using a wire brush, vacuum, or compressed air. Clean cracks allow proper bonding.
Step 2: Choose the Right Crack Filler
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Concrete crack filler for hairline cracks
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Polyurethane sealant for flexibility
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Epoxy crack filler for added strength
Step 3: Apply the Filler
Use a caulking gun or applicator to push the filler deep into the crack. Smooth the surface with a putty knife.
Step 4: Let It Cure
Allow the repair to fully cure before driving or placing heavy loads on the garage floor.
Repairing Medium Cracks in Garage Concrete
Cracks wider than 1/8 inch require a stronger repair method.
Step 1: Widen and Prepare the Crack
Use a grinder or chisel to slightly widen the crack into a “V” shape. This improves bonding and longevity.
Step 2: Clean Thoroughly
Remove loose concrete and dust. Any debris left behind can weaken the repair.
Step 3: Apply Concrete Repair Mortar
Polymer-modified concrete repair mortars provide high strength and durability, making them ideal for garage floors.
Step 4: Level the Surface
Trowel the repair flush with the surrounding concrete and allow it to cure completely.
Fixing Large or Structural Garage Floor Cracks
Large cracks in garage floors should never be ignored. These cracks often signal deeper issues.
Professional Repair Options Include:
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Epoxy Crack Injection: Bonds concrete back together and restores structural strength
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Polyurethane Injection: Flexible and ideal for cracks caused by movement
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Concrete Grinding and Resurfacing: Levels and restores damaged surfaces
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Epoxy or Polyaspartic Coatings: Seal the repaired floor and prevent future damage
At Crown Coatings, we assess both the visible crack and the underlying cause before recommending a long-term solution.
Why Garage Floor Coatings Matter After Crack Repair
Repairing cracks is only part of the solution. Without protection, new cracks may form.
Benefits of Garage Floor Coatings:
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Prevent moisture penetration
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Protect against oil, chemicals, and stains
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Increase impact and abrasion resistance
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Improve appearance and safety
Epoxy and polyaspartic garage floor coatings not only protect repaired areas but also create a seamless, easy-to-clean surface that lasts for years.
Preventing Future Garage Floor Cracks
Once repaired, taking preventive steps helps extend the life of your garage floor.
Install Control Joints
Control joints help manage cracking by allowing concrete to expand and contract naturally.
Seal or Coat the Floor
Protective coatings reduce wear, moisture damage, and chemical exposure.
Maintain Proper Drainage
Ensure water flows away from the garage to prevent moisture buildup beneath the slab.
Schedule Regular Inspections
Early detection of small cracks prevents costly repairs later.
When Should You Call a Professional?
DIY solutions work for minor cracks, but professional repair is recommended if:
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Cracks are widening or spreading
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The floor feels uneven or sinking
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Moisture seeps through cracks
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The garage supports heavy vehicles or equipment
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You want a long-lasting, polished finish
Professional repair ensures the issue is fixed properly—not just temporarily covered.
Why Choose Crown Coatings for Garage Floor Repair?
At Crown Coatings, we combine expert concrete repair with high-performance flooring systems to deliver durable, attractive garage floors.
What Sets Us Apart:
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Detailed crack assessment and honest recommendations
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Industry-leading epoxy and polyaspartic systems
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Long-lasting, low-maintenance finishes
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Service across Vancouver and surrounding areas
Whether your garage floor needs minor crack repair or a complete epoxy flooring system, our team ensures results that stand the test of time.
Final Thoughts
A cracked garage floor doesn’t have to mean costly replacement. With the right repair approach and proper protection, you can restore your concrete floor’s strength, appearance, and durability.
If your garage floor shows signs of cracking, Crown Coatings is here to help. Contact us today for professional garage floor repair and coating solutions designed to last.
