Concrete is one of the strongest and most durable construction materials available, but even concrete isn’t immune to cracking. Over time, changes in temperature, moisture, ground movement, and heavy loads can all lead to cracks forming in concrete floors, driveways, garages, and slabs. While some cracks are purely cosmetic, others can indicate deeper structural issues that should never be ignored.
At Crown Coatings, we specialize in concrete repair, polished concrete, epoxy flooring, and protective coatings across Vancouver and surrounding areas. In this guide, we’ll explain why concrete cracks, how to fix different types of cracks, and when it’s best to call a professional to ensure long-term performance and durability.
Why Does Concrete Crack?
Understanding the cause of cracking is the first step toward choosing the right repair solution.
1. Shrinkage During Curing
As concrete cures, excess water evaporates. This natural shrinkage often causes hairline cracks, especially in large slabs.
2. Temperature Changes
Concrete expands in heat and contracts in cold. In climates like British Columbia, seasonal freeze-thaw cycles can stress concrete and lead to cracking.
3. Heavy Loads and Impact
Garages, warehouses, and commercial spaces are exposed to vehicles, machinery, and equipment. Over time, excessive weight can weaken concrete and create structural cracks.
4. Soil Movement
If the ground beneath a slab shifts due to poor compaction, erosion, or moisture changes, the concrete above can crack as a result.
5. Poor Installation
Improper mixing, inadequate reinforcement, or missing control joints during installation can significantly increase the risk of cracking.
Types of Concrete Cracks (And What They Mean)
Not all cracks are the same. Identifying the type helps determine the correct repair method.
Hairline Cracks
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Very thin and shallow
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Usually cosmetic
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Common in new concrete
Shrinkage Cracks
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Appear within weeks of installation
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Often irregular or spider-web shaped
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Usually non-structural
Settlement Cracks
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Caused by soil movement
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Can widen over time
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May indicate underlying issues
Structural Cracks
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Wide, deep, or uneven
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Often run through the entire slab
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Require professional repair
How to Fix Small or Hairline Concrete Cracks
For minor cracks, early repair can prevent them from spreading.
Step 1: Clean the Crack
Remove dust, dirt, and debris using a wire brush or vacuum. A clean surface ensures proper bonding.
Step 2: Choose the Right Filler
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Concrete crack filler or sealant works well for hairline cracks
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Polyurethane or acrylic sealants provide flexibility and moisture resistance
Step 3: Apply the Filler
Carefully apply the filler into the crack using a caulking gun or trowel. Smooth the surface for a clean finish.
Step 4: Allow Proper Curing
Follow the manufacturer’s curing time before walking or placing loads on the surface.
How to Repair Medium Cracks in Concrete
For cracks wider than 1/8 inch, a stronger repair method is required.
Step 1: Widen the Crack
Use a grinder or chisel to slightly widen the crack. This allows the repair material to penetrate deeper and bond better.
Step 2: Clean Thoroughly
Remove all loose concrete and dust. Moisture or debris can weaken the repair.
Step 3: Use a Concrete Repair Mortar
Polymer-modified repair mortars are ideal for medium cracks and provide excellent strength.
Step 4: Level and Cure
Trowel the repair flush with the surrounding surface and allow it to cure fully.
Fixing Large or Structural Concrete Cracks
Large cracks should never be ignored, especially in garages, warehouses, or commercial floors.
Professional Repair Methods Include:
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Epoxy Injection: Bonds cracked concrete back together, restoring strength
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Polyurethane Injection: Flexible and ideal for cracks caused by movement
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Concrete Overlay Systems: Restore appearance and performance
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Grinding and Coating: Seals repaired areas with epoxy or polyaspartic coatings
At Crown Coatings, we assess the cause of the crack before recommending the most effective long-term solution.
Preventing Future Concrete Cracks
Fixing cracks is important—but preventing them is even better.
Install Control Joints
Control joints allow concrete to crack in planned locations, reducing random cracking.
Apply Protective Coatings
Epoxy, polyaspartic, and polished concrete systems protect concrete from moisture, chemicals, and wear.
Maintain Proper Drainage
Standing water can weaken concrete over time. Good drainage prevents moisture-related damage.
Regular Inspections
Early detection of small cracks helps avoid expensive repairs later.
When Should You Call a Professional?
DIY repairs are fine for minor cracks, but professional help is recommended if:
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Cracks are widening or spreading
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Concrete feels uneven or sinking
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Moisture is seeping through cracks
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The floor supports heavy loads
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Appearance and durability matter (commercial or residential spaces)
Professional repairs ensure the problem is fixed at its source—not just covered up.
Why Choose Crown Coatings for Concrete Crack Repair?
At Crown Coatings, we go beyond surface-level fixes. Our team uses industry-proven repair techniques combined with high-performance flooring systems to deliver results that last.
What Sets Us Apart:
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Expert assessment and honest recommendations
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Advanced epoxy, polyaspartic, and polished concrete solutions
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Long-lasting, low-maintenance finishes
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Trusted service across Vancouver and surrounding areas
Whether it’s a garage floor, warehouse slab, or commercial concrete surface, we provide repairs that improve strength, appearance, and longevity.
Final Thoughts
Concrete cracks are common—but they don’t have to become a major problem. Understanding the type of crack and using the right repair method can save time, money, and future headaches. For lasting results, professional repair and protective coatings offer the best long-term value.
If your concrete floors show signs of cracking, Crown Coatings is here to help. Contact us today for expert concrete repair and flooring solutions designed to stand the test of time.
