Patent attributes
A laminated construction having a first layer having a plurality of criss-crossing foamed filaments adhered to each other and defining a net, an impermeable layer laminated to the first layer along two opposite longitudinal edges to form a sleeve, and a perforated pipe extending within the sleeve. In another embodiment, a porous membrane surrounds the layer having a plurality of criss-crossing foamed filaments adhered to each other. In another embodiment, the laminated construction forms a pipe having a first layer having a plurality of criss-crossing foamed filaments adhered to each other and defining a net, an impermeable layer laminated to the first layer along two opposite longitudinal edges to form a sleeve, and a plurality of loose fill elements are within the sleeve for passage of fluid therethrough.
