How to Fix Cracks in Concrete Driveway
Clean debris. Insert backer rod. Fill with self-leveling polyurethane sealant (Sikaflex). Do not use rigid mortar patches.
How to Fix Cracks in Concrete Driveway: Professional Method
Fixing driveway cracks properly prevents them from getting worse and keeps water out. The wrong repair method will fail quickly. This guide covers the professional approach that actually works.
Step 1: Clean Debris
Remove all loose material, dirt, and debris from the crack. Use:
- Wire brush
- Compressed air or vacuum
- Pressure washer (low pressure) if needed
The crack must be completely clean for the sealant to adhere properly.
Step 2: Insert Backer Rod (For Wide Cracks)
For cracks wider than 1/4 inch, insert backer rod (foam rope):
- Compress backer rod slightly so it fits snugly
- Place it at the bottom of the crack
- This reduces the amount of sealant needed
Step 3: Fill with Self-Leveling Polyurethane Sealant
Use self-leveling polyurethane sealant (like Sikaflex):
- Flexible—expands and contracts with temperature
- Waterproof
- Won't crack like rigid materials
- Self-leveling for easy application
Apply according to product directions. Smooth the surface if needed.
What NOT to Use
Don't use rigid mortar patches:
- They crack and fail
- Don't expand/contract with concrete
- Create more problems than they solve
The Bottom Line
Clean thoroughly, use backer rod for wide cracks, and fill with flexible polyurethane sealant. Never use rigid mortar—it will fail. Proper crack repair prevents water damage and stops cracks from getting worse.
Need professional crack repair? Contact Local Concrete Contractor. We use the right materials and techniques for lasting repairs.
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