Abstract: An insulative waterproof drainage material is presented. The insulative drainage system comprises, in part, a plastic sheet having a plurality of alternate valleys and raised portions in the sheet defining a core. Preferably, the core leads to a slotted pipe. The core has two opposing surfaces. One surface has a water previous fabric material attached thereto while the other surface has a layer of thermally insulative material, preferably a polymeric foam material thereon. The foam or other insulative material has a pre-selected thickness which provides a sufficient R (thermal) value. This insulative drainage system is formed into panels and then adhesively applied to the exterior of a foundation or other retaining wall using any suitable and well known adhesive. Preferably, each panel is provided with interlocking joints which permit a watertight fit between adjacent panels.

Abstract: A continuous method of manufacturing a drainage system and apparatus therefore comprises a continuous assembly line which forms a plastic core material followed by continuously forming an envelope surrounding the formed plastic core and then sealing the stuffed envelope. In a preferred embodiment of the present invention, an extruder is used to transform granulated plastic material into sheet form. This plastic sheet is then fed directly into a plastic forming machine. The plastic forming machine will form a plurality of hills and valleys in the plastic sheet thereby defining a plastic core. Thereafter, continuous sheets of permeable fabric material are attached to the upper and lower surfaces of the formed core while the edges of the permeable fabric are secured to one another either by adhesive, sewing or any other suitable bonding method. Next, the draining system is either cut into desired lengths or rolled for shipping purposes.