Polymeric sand is a jointing material for paver patios that contains silica sand and polymer binders. When activated with water, the polymers bind the sand particles together, creating a firm joint that resists washing out, weed growth, and insect entry. It's the industry standard for properly installed paver patios. Patios jointed with standard sand re-sand every 2–3 years. Properly installed polymeric sand lasts 10+ years before needing attention.
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