polymeric sand is an advanced jointing material designed to lock pavers together, strengthen the surface, and resist weed growth. However, many homeowners ask whether it can make a patio, walkway, or driveway completely waterproof. The short answer is no—polymeric sand does not make pavers 100% waterproof. But it does provide significant water resistance and helps improve the durability of the paved surface.
Why Polymeric Sand Improves Water Resistance
Polymeric sand contains special additives that harden when activated with water. Once cured, it forms a semi-solid, flexible joint that minimizes the amount of water that can seep between pavers. This has several advantages:
- Reduces erosion: Water cannot easily wash out the jointing material.
- Prevents base destabilization: By limiting water infiltration, the gravel or sand base beneath pavers stays more compact and stable.
- Minimizes weed growth: Moisture trapped in loose joints creates ideal conditions for weeds. Polymeric sand makes it harder for them to establish.
Why Pavers Still Allow Some Water Penetration
Even with polymeric sand, pavers are not a sealed surface like Poured Concrete. Tiny gaps and natural permeability allow a small amount of water to pass through. This is actually beneficial, as it promotes drainage and prevents puddling on the surface.
Best Practices for Maximum Protection
To get the most water resistance out of polymeric sand, proper installation is crucial:
- Clean joints thoroughly before applying the sand.
- Fill joints completely to the recommended depth.
- Mist lightly with water in several passes, avoiding over-saturation.
- Ensure good base preparation and slope so water naturally drains away.
Final Verdict
Polymeric sand won’t make your paver installation fully waterproof, but it does greatly improve water resistance. By reducing washout, stabilizing the joints, and minimizing weed growth, it helps your patio, driveway, or walkway last longer with less maintenance.
