Can Weeds Grow Between Interlock Pavers? And How Do I Prevent It?

Nothing ruins a beautiful interlock driveway faster than weeds.

You invested in those gorgeous paving stones. The pattern looks amazing. Then spring arrives—and dandelions start poking through. Crabgrass appears. Moss creeps in. Suddenly, your expensive driveway looks neglected.

Sound familiar?

Whether you’re in Vaughan, Richmond Hill, or anywhere in the GTA, this “green invasion” is frustrating. But here’s the thing: weeds aren’t just ugly. They’re often the first sign of structural problems underneath.

Understanding why weeds grow—and how to stop them—is essential for protecting your investment.

Why Weeds Appear in Your Interlock

Here’s a surprise: weeds don’t grow up from below your pavers.

Many homeowners in Markham and Aurora assume weeds push through from the soil underneath. That’s rarely true. Quality interlock installation includes layers of compacted gravel and sand. Seeds can’t survive down there.

Weeds almost always start from the top.

Here’s what actually happens:

🔹 Wind blows seeds onto your driveway
🔹 Birds drop seeds in their droppings
🔹 Leaves and debris settle in the joints
🔹 Seeds find a home in the gaps between stones

The key factor: joint sand condition

If the sand between your pavers has washed away or eroded, seeds have the perfect place to germinate. Once roots take hold, they trap more moisture and dirt. More weeds follow. The cycle accelerates.

Eventually, roots push stones apart. What started as a few weeds becomes a structural problem requiring expensive repair.

How Canadian Weather Makes It Worse

GTA homeowners face unique challenges. Our climate is brutal on interlock surfaces.

The freeze-thaw cycle destroys joint sand:

Water enters the joints between your pavers. Temperature drops overnight. That water freezes and expands by about 9%.

Expanding ice pushes stones apart. Gaps get wider. The polymeric sand that locks everything together weakens and cracks.

Then spring arrives:

Melting snow carries away loose sand. Empty voids remain between stones. These gaps become perfect “landing strips” for weed seeds.

The cycle continues:

One harsh winter can undo years of curb appeal. Without proper maintenance, your interlock becomes more vulnerable each season. More gaps. More weeds. More damage.

Your First Line of Defense: Polymeric Sand

The material in your joints matters enormously.

Modern interlock professionals use polymeric sand—a specialized mix of fine sand and binding polymers. When activated with water, this sand hardens into a firm but flexible bond.

What quality polymeric sand does:

🔹 Blocks Weed Growth — Creates a hard surface that seeds can’t penetrate

🔹 Deters Insects — Stops ants and bugs from nesting in the joints

🔹 Resists Washout — Stays in place during heavy rainstorms

🔹 Prevents Water Damage — Keeps moisture from reaching the base layer

🔹 Maintains Stability — Holds stones firmly in their original positions

The problem:

Even quality polymeric sand erodes over time. Weather, traffic, and cleaning wear it down. Once it fails, your joints become vulnerable again.

Regular inspection and re-sanding keeps protection strong.

Already Have Weeds? Here’s What to Do

If weeds have invaded your interlock, don’t just pull them. That removes the visible plant but leaves roots behind. New weeds sprout within weeks.

The right approach starts with professional power washing.

At No Limit Sealing, we use commercial-grade pressure equipment to deep-clean your joints. We blast out:

🔹 Visible weeds and root systems
🔹 Old, contaminated sand
🔹 Organic debris and sludge buildup
🔹 Moss and mildew growth

This creates a “clean slate” for restoration. Fresh polymeric sand bonds properly to clean surfaces. Contaminated joints don’t hold new sand well.

The Ultimate Protection: Interlock Sealing

Once joints are clean and refilled with fresh polymeric sand, one step remains. And it’s the most important.

Interlock sealing is the ultimate shield against weeds.

Think of sealant as invisible armor for your driveway. It creates a protective barrier over stones and joints that weeds can’t penetrate.

What professional sealing provides:

🔹 Joint Stabilization — Further hardens polymeric sand, making it even more resistant to erosion and weed seeds

🔹 Stain Protection — Prevents oil, salt, and organic matter from soaking into porous stone

🔹 UV Defense — Stops the sun from fading your stone colors

🔹 Water Resistance — Keeps moisture from entering joints and causing freeze damage

🔹 Enhanced Appearance — Provides a “wet look” or matte finish that makes your property stand out

Sealing doesn’t just prevent weeds. It protects against every threat your interlock faces.

How to Keep Weeds Away Long-Term

At No Limit Sealing we know prevention beats treatment every time. Here’s your maintenance plan:

Inspect joints every spring:

After winter, check for sand erosion. Look for gaps or empty spaces between stones. Catch problems before weeds take hold.

Remove debris regularly:

Leaves and organic matter create perfect conditions for seeds. Sweep or blow debris off your driveway regularly.

Address weeds immediately:

Spot a weed? Remove it now—roots and all. One weed becomes many if left alone.

Re-sand as needed:

When joints show erosion, add fresh polymeric sand. Don’t wait until gaps are obvious.

Seal every 3-5 years:

Professional sealing maintains your protective barrier. It’s much cheaper than repairing weed damage.

Don’t Let Weeds Become a Bigger Problem 

A few dandelions seem harmless. But weeds signal that your joint protection has failed. Water is getting in. Freeze damage is coming. Stones will start shifting.

The progression is predictable:

Small weeds → More weeds → Root damage → Shifting stones → Expensive repairs

Stop the cycle early.

Professional cleaning, sanding, and sealing costs far less than interlock repair. And it keeps your driveway looking beautiful through every Canadian season.

Contact No Limit Sealing today to schedule a professional assessment.

We’ll inspect your joints, remove existing weeds properly, and protect your interlock against future invasions.

Call now and reclaim your weed-free driveway.

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We’ll identify exactly what’s causing your sinking or shifting. We’ll fix the root problem—not just the symptoms. And we’ll protect your repair against future damage.

Call now and restore your interlock to its original beauty. 

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