How do I prevent weeds from growing between my interlock pavers?

Polymeric sand is your best defense against weeds in paver joints, especially in Metro Vancouver's moist climate where weed growth is a persistent challenge. Unlike regular sand that washes out and provides an ideal growing medium for weeds, polymeric sand hardens when activated with water, creating a semi-rigid barrier that prevents weed seeds from germinating in the joints.

Why Weeds Love Regular Sand Joints

Standard jointing sand creates perfect conditions for weed growth — it retains moisture, provides nutrients when organic matter accumulates, and offers no resistance to root penetration. In Metro Vancouver's climate with over 1,200mm of annual rainfall and 60-80% humidity levels, regular sand joints become mini greenhouses for dandelions, moss, grass, and other opportunistic plants. Once weeds establish in joints, their roots spread beneath pavers and can actually lift and displace them over time.

Polymeric Sand Installation

Quality polymeric sand from manufacturers like Techniseal, Alliance, or Sakrete costs $25-40 per 50-pound bag (covering approximately 100-150 sq ft depending on paver size and joint width). Professional installation runs $2-4 per sq ft, while DIY application is feasible for most homeowners. The process involves sweeping out old sand completely, cleaning joints with a pressure washer or shop vacuum, ensuring pavers are completely dry, spreading polymeric sand and sweeping it into joints until full, removing excess sand from paver surfaces, then activating with a fine water mist — never flooding, which causes the polymers to wash out before curing.

Additional Weed Prevention Strategies

Pre-emergent herbicide applied in early spring (March-April in Metro Vancouver) prevents weed seeds from germinating for 3-4 months. Products containing corn gluten meal or synthetic pre-emergents like pendimethalin work well on established paver installations. Proper drainage is equally important — standing water in low spots encourages both weed growth and moss establishment. Ensure your paver installation has minimum 2% slope away from buildings and functional drainage at low points.

Maintenance Schedule for Metro Vancouver

Even quality polymeric sand degrades over time in Vancouver's wet climate and typically requires replenishment every 3-5 years, compared to 5-8 years in drier regions. Signs it's time to re-sand include visible gaps in joints, moss growing through joints, or weeds establishing despite previous polymeric sand application. Annual moss treatment in fall using iron sulfate or zinc sulfate-based moss killers prevents the slippery, weed-harboring moss growth that's common on north-facing installations and shaded areas.

When to Hire a Professional

DIY polymeric sand application works well for small areas under 200 sq ft, but larger installations benefit from professional application. Contractors have commercial-grade equipment for thorough joint cleaning, proper sand compaction into joints, and controlled water activation that prevents surface hazing. Professional re-sanding typically runs $3-5 per sq ft including joint cleaning, new polymeric sand, and activation — worthwhile for driveways and large patios where improper application can create expensive surface damage.

Need help finding an interlock maintenance professional? Vancouver Interlock can match you with experienced contractors from the Vancouver Construction Network who understand Metro Vancouver's unique climate challenges.

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Find a Interlock & Paver Contractor

Vancouver Interlock connects you with experienced contractors through the https://vancouverconstructionnetwork.com:

• Luvipe Excavation Ltd. ✓
• Tonic Siding ✓
• Luciuk Driveway Sealing ✓