Patent ID: 8029376

Claim:
A rollable sheet-like athletic surface building material adapted to be joined in side-by-side parallel relation with additional lengths of the same material comprising: an elongate rollable sheet of resilient plastic core material having non-coextensive top and bottom surfaces joined by integral vertical walls and having left and right parallel edges; an edge flange formed substantially continuously along one edge as an extension of said bottom surface wherein said flange is on the order of four inches in width; a top layer of impervious pliable sheet material having left and right parallel edges, said layer being adhesively bonded to top surfaces of said plastic core material and forming a substantially continuous unbonded flap along the edge that overlies said flange; and a strip of adhesive material extending along the opposite edge of said top layer to receive and be adheringly bonded to the underside of said flap when two lengths of said surface building material are arranged and joined in parallel adjacent and overlapping relationship.