Polymeric sand is what holds interlocking pavers together. It is sand mixed with a binder that hardens once it gets wet, and it fills the joints between the stones, sets hard, and keeps weeds, ants and water out so the stones stop moving. Polymeric sanding is for interlock and paver surfaces only: driveways, patios, walkways and front steps. We do not sand deck joints. Wood and pool decks get pressure washing on their own.
Regular sand washes out over time. The joints turn into weed gardens, ants colonize the gaps, and the pavers start to wobble. By the time most people notice, half the joints are already empty. We take the surface back to day one: pressure wash between every crack and off the face of every stone, strip the old sand, weeds and ant hills out, then once it is fully dry, brush brand new polymeric sand into every joint until it is packed level, and mist it in light passes so it hardens in place.
