Unlike conventional block paving, Driveway Infilta is a permeable product that offers a solution to the legislation for front of homes. It allows rainwater to filter though gaps between the blocks into a stone sub-base below, where there is enough space to store the water for a short time. This water then either soaks into the ground, is discharged in a controlled manner to a surface water drainage system or is collected for re-use. Available in four colours & one size. Each pack contains 404 units to cover 8.08m 2. Thickness: 60mm