Base For Turf System

Abstract

An underlayment layer is configured to support an artificial turf assembly. The underlayment layer comprises a core with a top side and a bottom side. The top side has a plurality of spaced apart, upwardly oriented projections that define channels suitable for fluid flow along the top side of the core when the underlayment layer is positioned beneath an overlying artificial turf assembly.

What is claimed is: 
     
         1 . A turf underlayment layer comprised of an assembly of panels, the panels including a top side having a plurality of projections, a bottom side, and panel edges, the plurality of top side projections forming top side channels that extend across the top side of the panel to allow drainage of fluid across the top side of the panel, and the bottom side having bottom side channels that extend across the bottom side of the panel to allow drainage of fluid across the bottom side of the panel, the panel edges within the turf underlayment layer abutting and interlocking with edges of adjacent panels, the panels further including a plurality of drain holes positioned through the panel to allow fluid to flow from the top side of the panel to the bottom side of the panel, where 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.