#edge restraints

An interlocking driveway is designed to handle years of vehicle traffic, changing weather, and seasonal ground movement. Yet some installations begin showing signs of wear much sooner than expected. Loose pavers, uneven surfaces, widening joints, and shifting borders often have one thing in common. They usually trace back to decisions made during installation rather than the quality of the pavers themselves.

A well-built interlocking surface depends on much more than appearance. Every layer, from excavation to the final compaction, plays a role in how the driveway performs over time.

Here are seven common installation mistakes that can reduce the lifespan of an interlocking project.

1. Inadequate Excavation

Everything starts below the surface.

If the excavation depth isn't sufficient for the expected load, the base material won't provide the structural support needed to carry vehicles year after year. Instead of distributing weight evenly, the ground begins settling unevenly, leading to dips and low spots across the driveway.

Proper excavation isn't about removing soil until the area looks level. It's about creating enough space for a stable foundation that matches the site's conditions.

2. Poor Base Compaction

Adding crushed aggregate alone doesn't create a strong foundation.

Each layer needs to be compacted thoroughly before the next one is added. If this step is rushed, small air pockets remain inside the base. Over time, these voids collapse under repeated traffic, causing sections of the driveway to sink.

Many settlement issues become visible only after the first winter because the changing moisture content exposes weaknesses that weren't noticeable immediately after installation.

A solid base is one of the biggest factors separating a driveway that lasts decades from one that requires frequent repairs.

3. Ignoring Drainage

Water is one of the biggest threats to any hardscape.

When drainage isn't planned correctly, moisture accumulates beneath the pavers instead of flowing away from the surface. During freezing temperatures, trapped water expands and places additional pressure on the base.

Repeated freeze-thaw cycles accelerate settlement and can eventually create uneven sections throughout the installation.

Proper grading helps direct water away before it becomes a long-term problem.

4. Inconsistent Joint Sand

Joint sand does more than fill the gaps between pavers.

It creates friction that helps each unit resist movement under load. If the joints aren't filled properly or the sand isn't compacted into every gap, the surface becomes more vulnerable to shifting.

Rain, traffic, and normal weathering gradually remove loose sand, making it easier for pavers to move independently.

Periodic maintenance helps preserve the interlock, but correct installation remains the most important factor.

5. Weak Perimeter Support

The outer rows of an interlocking driveway experience continuous outward pressure from traffic and seasonal ground movement.

If those edges aren't properly supported, the entire paver field gradually begins expanding beyond its original alignment. What starts as a slightly widened joint near the border can eventually affect a much larger portion of the surface.

Because perimeter support is hidden after installation, many homeowners don't realise its importance until visible movement appears. Understanding how edge restraints in interlocking keep the entire system confined provides useful context when evaluating long-term durability.

6. Using the Wrong Materials

Not every aggregate or bedding material performs the same.

Low-quality materials may compact poorly, retain excess moisture, or break down more quickly under repeated loading. Even if the finished driveway looks identical on installation day, inferior materials often shorten its service life.

Choosing materials suited to local soil conditions and climate helps the installation perform more consistently over the years.

7. Rushing the Final Stages

The last steps are just as important as the first.

Final compaction locks the pavers together, distributes joint sand throughout the surface, and helps establish the interlocking action that gives the system its strength.

Skipping extra compaction passes or finishing too quickly leaves small inconsistencies that may not become visible until regular traffic begins stressing the driveway.

Taking the time to complete these final details often makes the difference between a surface that remains stable and one that develops avoidable maintenance issues.

Long-Term Performance Starts Before the First Paver Is Laid

Many homeowners focus on choosing the right colour, pattern, or border design. While aesthetics matter, they're only one part of a successful installation.

The real performance of an interlocking driveway depends on the structural work completed before the finished surface is ever visible. Proper excavation, base preparation, drainage, compaction, joint stabilisation, and perimeter support all work together as a single system.

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