What type of polymeric sand should I use for my interlock driveway in Ottawa, and how often does it need replacing?

Polymeric sand is the binding agent between your interlock pavers, and choosing the right product for Ottawa's extreme climate makes a significant difference in how long your joints stay intact.

Types of Polymeric Sand

There are two main categories available from Ottawa landscape supply yards:

• Standard polymeric sand ($20 to $30 per bag covering roughly 30 to 50 square feet): Activates with water, hardens into a flexible joint filler. Brands like Techniseal RG+ and Alliance Gator Maxx are widely used by Ottawa contractors. These work well but can degrade faster in high-moisture environments.

• Next-generation polymeric sand ($35 to $50 per bag): Products like Techniseal HP NextGel and Alliance Gator XP use advanced polymers that resist rain washout during curing and hold up better against power washing. These are increasingly the default choice for Ottawa driveways because they handle our spring runoff conditions far better.

Our roughly 200 cm of annual snowfall, combined with freeze-thaw cycles that can repeat 30 to 40 times per winter, places enormous stress on joint sand. Water seeps into joints, freezes and expands, then thaws and contracts. Over multiple cycles, this gradually breaks down the polymer bond. Road salt tracked onto your driveway from city streets accelerates deterioration, and snowplow blades can physically scrape sand from the joints.

How Often to Re-Sand in Ottawa

With quality polymeric sand and proper initial application, most Ottawa interlock driveways need partial re-sanding every 3 to 5 years and a full strip-and-resand every 6 to 8 years. Driveways in low-lying areas of Orleans and Gloucester that see more water pooling may need attention sooner. High-traffic areas near the garage entrance wear faster than the centre of the driveway.

Application Tips for Ottawa Conditions

Polymeric sand should be applied when the forecast shows no rain for at least 24 hours and daytime temperatures are above 15°C. In Ottawa, this realistically limits application to mid-May through early October. The pavers must be completely dry before sweeping sand into joints — morning dew in spring and fall can linger in shaded areas of driveways backed by trees, common in neighbourhoods like Alta Vista and Westboro.

Cost to Re-Sand a Driveway

Professional re-sanding of a 600-square-foot driveway in Ottawa typically runs $500 to $1,200, depending on whether the old sand needs pressure-washing out first or just topping up. DIY is possible but requires a plate compactor and careful water activation — too much water washes the polymers to the surface and creates a white haze.

Connect with local interlock maintenance specialists through Ottawa Driveways to get your joints inspected and re-sanded before the next winter season.

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Looking for experienced contractors? The Ottawa Construction Network connects Ottawa homeowners with qualified professionals:

• Luxe Painting and Renovations
• RenoMotion Inc.
• Capital City Drywall
• Driveway Sealing Ottawa
• Demontigny Carpentry