Cracks in a concrete garage floor are a common issue for homeowners and commercial property owners alike. While small cracks may seem harmless at first, they can quickly grow into larger problems if left untreated. Moisture intrusion, temperature changes, heavy vehicle loads, and soil movement can all worsen existing cracks, leading to costly repairs down the line.
At Crown Coatings, we specialize in concrete floor repair, epoxy flooring, and polyaspartic garage floor coatings that restore strength, functionality, and appearance. In this guide, we’ll explain why garage floor cracks happen, how to repair them properly, and how to protect your concrete floor for long-term durability.
Why Do Cracks Form in Concrete Garage Floors?
Concrete is strong, but it’s not immune to stress. Understanding the cause of cracks is the first step toward effective repair.
1. Temperature Changes
Concrete expands in warm weather and contracts in cold conditions. Over time, this constant movement causes stress cracks, especially in garages exposed to outdoor temperatures.
2. Heavy Loads
Vehicles, tools, storage cabinets, and equipment put continuous pressure on garage floors. This weight can cause cracking, particularly if the slab lacks proper reinforcement.
3. Moisture and Water Damage
Water seeping into cracks can weaken the concrete internally. In colder conditions, freeze-thaw cycles cause the water to expand, making cracks wider and deeper.
4. Soil Settlement
If the soil beneath the slab wasn’t compacted properly or shifts over time, the concrete above may crack as it settles.
5. Poor Concrete Installation
Improper curing, missing control joints, or low-quality concrete mixes can result in early cracking.
Types of Concrete Garage Floor Cracks
Not all cracks are the same, and the repair method depends on the type and severity.
Hairline Cracks
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Thin and shallow
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Mostly cosmetic
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Easy to repair
Shrinkage Cracks
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Occur during the curing process
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Usually non-structural
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Common in newer garages
Settlement Cracks
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Caused by ground movement
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May widen over time
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Require closer attention
Structural Cracks
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Wide, deep, or uneven
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Can indicate serious foundation issues
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Best handled by professionals
How to Repair a Crack in a Concrete Garage Floor
Step 1: Inspect and Assess the Crack
Measure the width and depth of the crack. If the crack is wider than 1/4 inch, continues to grow, or shows signs of moisture, professional repair is recommended.
Step 2: Clean the Crack Thoroughly
Remove dirt, dust, grease, and loose concrete using:
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A wire brush
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Vacuum or compressed air
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Degreaser for oil stains
A clean surface ensures proper bonding of repair materials.
Step 3: Prepare the Crack
For wider cracks, slightly widen the crack using a grinder or chisel to create a “V” shape. This allows repair materials to penetrate deeper and hold longer.
Step 4: Choose the Right Repair Material
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Concrete crack filler for hairline cracks
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Epoxy crack filler for structural strength
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Polyurethane sealant for flexibility and moisture resistance
Epoxy-based repairs are especially effective for garage floors because they restore strength and durability.
Step 5: Apply the Crack Repair Product
Carefully apply the filler or epoxy into the crack using a caulking gun or putty knife. Make sure the material fully fills the crack without trapping air.
Step 6: Smooth and Level the Surface
Use a trowel or putty knife to smooth the repaired area flush with the surrounding concrete.
Step 7: Allow Proper Curing
Follow the manufacturer’s curing time before walking or driving on the surface. Rushing this step can weaken the repair.
Repairing Large or Structural Cracks
Large cracks or cracks that continue to reappear usually require professional-grade solutions.
Professional Repair Methods Include:
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Epoxy crack injection to bond the slab together
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Polyurethane injection for flexible, moisture-resistant repairs
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Concrete grinding and resurfacing to restore level surfaces
At Crown Coatings, we don’t just repair the visible crack—we address the underlying cause to prevent future damage.
Why Garage Floor Coatings Are Essential After Crack Repair
Repairing cracks alone is not enough. Without protection, new cracks may form.
Benefits of Epoxy and Polyaspartic Garage Floor Coatings:
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Seal repaired cracks from moisture
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Resist oil, chemicals, and stains
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Increase impact and abrasion resistance
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Improve overall appearance
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Extend the lifespan of the concrete floor
A professionally applied coating creates a seamless, durable surface that protects your investment.
Preventing Future Cracks in Your Garage Floor
After repairing cracks, preventative care is key.
Install Control Joints
Control joints help manage concrete movement and reduce random cracking.
Apply a Protective Coating
Epoxy or polyaspartic coatings protect against wear, moisture, and chemical damage.
Improve Drainage
Ensure water drains away from the garage to prevent moisture buildup beneath the slab.
Schedule Regular Maintenance
Early detection of small cracks helps prevent major repairs later.
When Should You Call a Professional?
DIY repairs work well for minor cracks, but professional help is recommended if:
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Cracks are wide or spreading
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The floor is uneven or sinking
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Moisture seeps through the cracks
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The garage supports heavy vehicles
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You want a long-lasting, high-end finish
Professional repair ensures safety, durability, and peace of mind.
Why Choose Crown Coatings?
Crown Coatings is a trusted name in concrete repair and garage flooring solutions.
What Sets Us Apart:
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Expert crack assessment and repair
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High-performance epoxy and polyaspartic systems
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Long-lasting, low-maintenance finishes
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Service across Vancouver and surrounding areas
Whether you need crack repair, garage epoxy flooring, or a complete concrete floor upgrade, our team delivers results built to last.
Final Thoughts
Cracks in a concrete garage floor should never be ignored. With proper repair and professional protection, you can restore your garage floor’s strength, safety, and appearance for years to come.
If your garage floor shows signs of cracking, Crown Coatings is here to help. Contact us today for expert concrete crack repair and premium garage floor coating solutions.
