How do you repair interlock pavers that have shifted or spread apart?

Repairing shifted or spread-apart interlock pavers requires lifting the affected pavers, correcting the underlying base issues, and reinstalling with proper edge restraints and joint sand. The repair approach depends on whether the shifting is localized (a few pavers) or widespread (indicating base or edge restraint failure).

Diagnosing the Problem First

Before starting repairs, identify why the pavers shifted. In Metro Vancouver's wet climate, the most common causes are inadequate edge restraints, washed-out joint sand from heavy rainfall, base settlement due to poor drainage, or root intrusion from nearby trees. Look for patterns — if pavers have spread uniformly along an unconfined edge, missing edge restraints are likely the culprit. If pavers have settled in low spots or near downspouts, drainage and base issues are probable. Random shifting throughout the installation often indicates insufficient base compaction or joint sand washout.

Small Area Repairs (Under 50 Square Feet)

For localized shifting affecting 10-20 pavers, homeowners can often handle the repair as a DIY project. Start by removing the shifted pavers using flat pry bars or paver pullers — work from the outside edges inward to avoid damaging adjacent pavers. Once the pavers are lifted, inspect the bedding sand layer. If the sand is contaminated with clay, organic matter, or has washed away entirely, scrape it out and replace with fresh concrete sand. Check that the base layer beneath (should be compacted 3/4-inch crushed gravel) is still firm and level. Add base material if needed and compact with a hand tamper.

Re-screed the bedding sand to a uniform 1-inch thickness using a straight board, then relay the pavers with tight joints. Install or repair edge restraints along any unconfined edges — snap-edge or aluminum L-channel restraints spiked into the compacted base every 12-18 inches. Finish by sweeping polymeric sand into all joints, removing excess from paver surfaces, and activating with a fine water mist according to manufacturer instructions. This type of repair typically costs $1,500-$4,000 when professionally done in Metro Vancouver.

Widespread Shifting (Major Repair)

If shifting affects large areas or the entire installation, the problem likely stems from inadequate base preparation, failed drainage, or missing edge restraints throughout the project. This requires professional repair because the base layer may need complete reconstruction. The contractor will lift all affected pavers, assess the base condition, and potentially excavate deeper to install proper drainage and achieve adequate base depth (6-8 inches for patios, 10-12 inches for driveways).

In Metro Vancouver's clay-heavy soils, widespread paver shifting often indicates that the original base was too shallow or that clay has migrated upward into the gravel base, destroying its drainage capacity. Professional repair includes installing geotextile fabric between the subgrade and base, ensuring proper compaction in 2-inch lifts, and establishing correct surface drainage slopes. Major repairs typically run $8-$15 per square foot, making it 50-75% the cost of complete reinstallation.

Edge Restraint Installation

Missing or failed edge restraints are the leading cause of paver spreading in Metro Vancouver. Every unconfined edge (not against a building, concrete curb, or retaining wall) must have proper edge restraints. Snap-edge restraints are most common for residential work — they're spiked through the base into the subgrade every 12-18 inches with 10-inch galvanized spikes. The restraint sits against the paver edge at the same height as the finished paver surface.

For curved edges, flexible aluminum or steel edge restraints bend to follow the curve. The key is that edge restraints must be installed during the base preparation phase, not added afterward. Retrofitting edge restraints to an existing installation requires lifting the edge pavers, installing the restraint system, and relaying the pavers against the restraint.

Metro Vancouver Considerations

Vancouver's persistent rainfall makes joint sand washout a chronic issue that accelerates paver shifting. Even with polymeric sand, joints require replenishment every 3-5 years. During repair, always use high-quality polymeric sand from manufacturers like Techniseal or Alliance — budget polymeric sands perform poorly in Vancouver's wet conditions and may need replacement within 1-2 years.

Clay soils prevalent in Surrey, Richmond, Delta, and Langley create additional challenges. If clay has contaminated the base layer, it must be excavated and replaced with clean gravel. Installing geotextile fabric during repair prevents future clay migration. Properties with mature trees (common in older Vancouver neighborhoods) may experience ongoing root-related shifting that requires periodic maintenance rather than permanent solutions.

When to Hire a Professional

Hire a professional for repairs affecting more than 100 square feet, any driveway repairs, or situations where the base layer appears compromised. Professional contractors have plate compactors, laser levels, and experience diagnosing base failures that aren't obvious to homeowners. They can also connect repairs to proper drainage systems and ensure compliance with municipal requirements if the work affects property drainage patterns.

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