Method for installing paving blocks

Claim 1

In a method of installing paving blocks comprising the steps of preparing an area to be paved to a desired grade; the improvement comprising the steps of: providing a sheet of preformed, load-bearing, board-type, foam material having sufficient load-bearing strength for supporting said paving blocks in addition to human and vehicular traffic traversing said paving blocks; placing said preformed sheet of foam material directly upon the prepared area and without need of an underlying supporting substructure; laying paving blocks in a desired pattern directly upon the preformed sheet of foamed material; depositing a joint filling, water-activated, polymeric sand in spaces existing between said paving blocks, and thereafter water spraying the sand to provide long-term stability to the finished paved surface; and wherein the sheet of foam material includes a grid marked on its exposed surface, said grid being arranged for positioning of said paving blocks.