Polymeric sand is a granular material placed between the joints and seams of brick pavers or stone used in patios, walkways and driveways. It’s primary function is to improve the interlock and therefore the durability and stability of a paved surface. Until several years ago, this function was performed most often with mason sand. Polymeric sand allows a one step process of sweeping in the sand to the seam and then lightly dampening with water to provide a firm interlocking joint. Polymeric sand is available is a variety of colors.