Patching vs Mudjacking: Lifting Sunken Slabs

Patching vs Mudjacking: Lifting Sunken Slabs - Which Solution Works?

Sunken concrete slabs require the right repair method. Patching is a cosmetic band-aid that doesn't fix the underlying problem. Mudjacking/poly-lift is a structural fix that raises the slab back to level. Understanding the difference helps you choose the right solution.

Patching: Cosmetic Band-Aid

Patching fills cracks and holes but doesn't fix sinking.

What It Does

• Fills cracks: Seals visible cracks
• Fills holes: Patches damaged areas
• Cosmetic improvement: Makes surface look better
• Doesn't lift slab: Slab remains sunken

Limitations

• Doesn't fix sinking: Slab is still unlevel
• Temporary fix: Problems will continue
• Waste of money: Doesn't address root cause
• Will crack again: Cracks return as slab continues to move

When Patching Alone Doesn't Work

• Sunken slab: If slab is unlevel, patching won't fix it
• Ongoing movement: If base is unstable, patching fails
• Structural issues: Patching doesn't address structural problems

Mudjacking/Poly-lift: Structural Fix

Mudjacking and poly-lift raise sunken slabs back to level.

How Mudjacking Works

1. Drill holes in sunken slab
2. Pump grout slurry under slab
3. Grout lifts slab as it fills voids
4. Slab returns to level

How Poly-lift Works

1. Drill holes in sunken slab
2. Inject polyurethane foam under slab
3. Foam expands, lifting slab
4. Slab returns to level

Benefits

• Raises slab: Lifts slab back to proper level
• Fills voids: Fills empty space under slab
• Structural fix: Addresses underlying problem
• Long-lasting: Permanent solution

When to Use Each

Use Patching For:

• Cosmetic cracks only (slab is level)
• Minor surface damage
• When slab is not sinking

Use Mudjacking/Poly-lift For:

• Sunken, unlevel slabs
• When you need to raise the slab
• Structural repairs
• Long-term solution

Cost Comparison (Example Only)

Disclaimer: These are example costs. Actual costs vary significantly.

Patching: Example cost approximately $200-$500+ per repair (varies by size and complexity)

Mudjacking/Poly-lift: Example cost approximately $500-$1,500+ depending on slab size and lift needed

Actual costs vary significantly. While patching may seem cheaper, it's a waste if the slab is sunken—you'll need mudjacking anyway.

The Bottom Line

Patching is a cosmetic band-aid that fills cracks but doesn't fix sinking—the slab remains unlevel. Mudjacking/poly-lift is a structural fix that raises the slab back to level by filling voids underneath. Don't waste money on patching a sunken slab—it won't fix the problem. Use mudjacking/poly-lift to raise sunken slabs back to level, then patch any remaining cosmetic issues if needed.

Have a sunken slab? Contact Local Concrete Contractor. We'll assess whether mudjacking/poly-lift is needed to properly fix your sunken concrete.