How do I refill polymeric sand in my Ottawa paver joints myself?

Refilling polymeric sand in interlock joints is a straightforward DIY project that Ottawa homeowners can tackle themselves, typically costing $300-800 in materials versus $800-1,500 professionally done. This maintenance should be performed every 3-5 years in Ottawa due to freeze-thaw displacement and is essential for preventing weed growth, ant intrusion, and paver shifting.

Timing is critical in Ottawa — polymeric sand must be installed when temperatures are consistently above 10°C with no rain forecast for 24-48 hours. Late spring through early fall (May through September) provides the best conditions. Avoid installation during Ottawa's hot summer afternoons when surface temperatures exceed 35°C, as the sand can set too quickly.

Start with thorough preparation. Remove all existing sand from joints using a pressure washer, shop vacuum, or specialized joint cleaning tool. For stubborn hardened polymeric sand, use a oscillating multi-tool with a grout removal blade. Clean joints should be 15-20mm deep — if they're shallower, you may have base settling issues that need addressing first. Sweep the entire surface clean of debris, and ensure pavers are completely dry before proceeding.

Purchase the right amount of polymeric sand — one 25kg bag typically covers 30-50 square feet depending on paver size and joint width. For a standard Ottawa driveway (400-600 square feet), expect to need 8-15 bags. Choose a high-quality polymeric sand designed for Ottawa's freeze-thaw conditions — brands like Techniseal, Alliance, or Sakrete perform well in our climate.

Application requires patience and precision. Pour sand onto the surface and sweep diagonally across joints with a push broom, ensuring complete filling without overpacking. Joints should be filled to within 3mm of the paver surface. Use a leaf blower or soft brush to remove all excess sand from paver surfaces — any residue left on the surface will create a hazy film when activated.

Activation is the critical step. Using a garden hose with a fine mist setting, lightly spray the entire surface to activate the polymers. The sand should darken and begin to firm up within 15-30 minutes. Apply water gradually — too much water too quickly will wash out the sand; too little won't activate the polymers properly. You may need 2-3 light misting sessions over 30-60 minutes.

Common Ottawa-specific challenges include our clay soil expanding and contracting beneath pavers, which can displace even properly installed polymeric sand. If you're refilling joints for the second or third time and they keep washing out, you likely have base settlement issues requiring professional releveling. Additionally, Ottawa's heavy snowplow traffic can chip polymeric sand from joints along driveway edges — consider using edge restraints or accepting that perimeter joints may need annual touch-ups.

The cured sand needs 24-48 hours to reach full strength before vehicle traffic. Light foot traffic is acceptable after 2-4 hours once the surface feels firm. Properly installed polymeric sand in Ottawa should last 3-5 years before requiring replacement, though high-traffic areas and driveway edges may need touch-ups sooner.

When to hire a professional: If more than 30% of your pavers have settled or shifted, if you have significant base failure causing repeated sand washout, or if your driveway requires releveling before sand replacement. These issues indicate structural problems beyond simple maintenance.

Need help finding a driveway contractor for more complex paver repairs? Ottawa Driveways can match you with local professionals through the Ottawa Construction Network.