Patent ID: 8568840
Filing Date: 2013-10-29
Classification: D10B,E01C,Y10T

Abstract:
1. A turf underlayment layer having panels including a top side having a plurality of projections, a bottom side having a plurality of projections, and panel edges, the plurality of top side projections forming top side channels and the bottom side projections forming bottom side channels, the panel edges configured to abut edges of adjacent panels, the panels further including a plurality of drain holes dispersed over the panel surfaces for fluid communication between the top side and the bottom side of the panel, the drain holes positioned to intersect both the top side and bottom side channels to connect the top side channels to the bottom side channels, wherein the panels are made from a plurality of polyolefin beads, the plurality of polyolefin beads bonded together by at least one of pressure and heat to produce a substantially water-impervious surface.