The aggregate used to build patios and walkways with pavers as the top layer is called a paver base. The subgrade is the layer of natural material that lies beneath a planned surface. A mixture of gravel is used to make the paver base for paving stones. The floor provides a strong base. Dust to three-quarters of an inch are among the sizes. Crushed limestone is the most often utilize... https://modutile.com/product/permeable-plastic-pavers-24x24/