How do you fix weeds growing between interlock pavers?

Weeds growing between interlock pavers are primarily caused by deteriorated or missing joint sand, and the fix involves removing the weeds, addressing the underlying sand issue, and applying preventive treatments. In Metro Vancouver's moist climate, weed growth in paver joints is one of the most common maintenance challenges homeowners face.

The root cause of weeds in paver joints is almost always compromised joint sand. When the original sand between pavers washes out (common with standard mason sand in Vancouver's heavy rainfall), erodes due to foot traffic, or was never properly installed, it creates gaps where soil accumulates and weed seeds germinate. Metro Vancouver's mild, wet winters and warm summers create ideal growing conditions for dandelions, clover, moss, and grass in these joints.

Start by removing existing weeds manually or with targeted herbicide application. For manual removal, use a narrow weeding tool or old kitchen knife to dig out weeds and their root systems when the soil is moist (easier digging). For larger areas, apply a selective herbicide designed for use around hardscaping - glyphosate-based products work well but require careful application to avoid damaging surrounding plants. Never use rock salt or chlorine bleach, as these damage polymeric sand and can harm nearby vegetation.

After weed removal, address the joint sand issue permanently. Sweep out all loose, contaminated sand from the joints using a stiff brush or shop vacuum. The joints should be cleaned to within 1/8 inch of the bottom of the pavers. Apply new polymeric sand (Techniseal, Alliance, or Sakrete brands perform well in Vancouver's climate) according to manufacturer instructions. Sweep the polymeric sand into joints, ensuring they're completely filled, then activate with a controlled water mist - not flooding. Properly activated polymeric sand hardens and creates a barrier that resists both weed growth and sand washout during Metro Vancouver's October-to-March rainy season.

For ongoing prevention, maintain your polymeric sand every 3-5 years in Metro Vancouver's climate. Even high-quality polymeric sand degrades over time due to the persistent moisture and frequent rainfall. Inspect joints annually in spring and top up any areas where sand has settled or eroded. Apply a pre-emergent herbicide in early spring before weed seeds germinate - corn gluten meal is an organic option that prevents seed germination without harming established plants.

Consider paver sealing for additional weed resistance. A quality penetrating sealer applied over clean pavers and properly cured polymeric sand creates an additional barrier against weed seed penetration and makes future cleaning easier. Sealing typically costs $3-6 per square foot and should be reapplied every 3-5 years.

Hire a professional for large areas or if the problem keeps recurring. If weeds return quickly after treatment, the issue may be inadequate base preparation, poor drainage causing soil migration from below, or tree root intrusion. Professional assessment can identify whether the pavers need to be lifted, the base rebuilt, or drainage improved - particularly important in Metro Vancouver where clay soils and high rainfall create unique challenges.

Need help finding an interlock maintenance professional? Vancouver Interlock can match you with experienced contractors who understand Metro Vancouver's specific climate challenges and can provide long-term solutions for weed-free paver installations.

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