The purpose of the joint sand is to fill up to 3/4 of the paver high stabilizing them and avoid spreading or wobbling. Joint sand is not grout. It is important to understand this because many people enjoy the look of joint sand on top of the pavers without realizing that it does not stay. While grout remains on the top of the tile because it is a binding agent, joint sand exists to keep the space between pavers locked together. This prevents the pavers from loosening, and helps stop any issues that may arise from loose pavers. Subsequently, joint sand will wash away on the top over time, inevitably. Joint sand in the cracks between pavers will remain for much time, however. Keeping joint sand visible requires constant management and for many customers is not worth it in the long haul. Consider what is best for your backyard.
