Unveiling the Secrets of Perfect Interlock Paver Repair Jan 20, 2026

Interlock Paver Repair: How to Fix Sunken, Shifting, and Uneven Interlock the Right Way

Interlock driveways, patios, and walkways are built to last — but even the best-looking interlock can start to sink, shift, or separate over time. In Southern Ontario, freeze-thaw cycles, heavy rain, and poor base preparation are some of the biggest reasons homeowners start seeing uneven interlock and drainage issues.

That’s where professional interlock repair and restoration comes in. Instead of replacing your entire driveway or patio, the right repair approach focuses on fixing the foundation and re-leveling the existing stones so your interlock looks great and stays that way.

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Why Does Interlock Sink or Become Uneven?

Most interlock problems don’t start at the surface — they start underneath.

Common causes of sunken or shifting interlock include:

• Poorly compacted base during the original installation

• Soil movement and erosion over time

• Water drainage issues

• Washed-out joint sand

• Heavy traffic areas, especially on driveways

When the base loses support, the interlock above it follows. Stones begin to dip, tilt, and spread apart, creating tripping hazards and areas where water pools.

If left untreated, these small issues can turn into much larger and more expensive repairs.

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What Is Interlock Repair and Re-Leveling?

Interlock repair — often called lift and relay — is the process of removing the affected stones, fixing the base, and reinstalling the same interlock at the correct height and slope.

This process typically includes:

• Lifting the existing interlock stones

• Rebuilding and compacting the base

• Adjusting drainage and slope if needed

• Re-leveling and reinstalling the stones

• Replacing joint sand with polymeric sand

This method allows homeowners to fix problem areas without tearing out and replacing the entire surface, saving significant cost while still restoring structural stability.

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When Do You Need Interlock Restoration Instead of Small Repairs?

Sometimes interlock issues are limited to a few spots. Other times, larger sections may be affected.

You may need full interlock restoration if you notice:

• Widespread sinking or uneven surfaces

• Large areas of missing or loose joint sand

• Ongoing weed growth between stones

• Water pooling after rainfall

• Spreading or separating paver edges

In these cases, restoring the interlock across a wider area ensures the base is consistent and prevents recurring problems.

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Why Polymeric Sand Is Important After Interlock Repair

After interlock is re-leveled, polymeric sand is swept into the joints and activated with water. This sand hardens and helps lock the stones together.

Benefits of polymeric sand include:

• Reduces weed growth

• Prevents ants from nesting in joints

• Helps prevent shifting and spreading

• Improves overall stability of the surface

Without proper joint sand, even well-leveled interlock can begin to move again over time.