Combined drainage and waterproofing panel system for subterranean walls

A combination drainage and waterproofing system for application to and protection of subterranean structures, such as walls, plaza decks or the like, the system comprising a plurality of composite panels, each of the plurality of composite panels further comprising:

• a drainage core, said drainage core having a front surface and a back surface and a plurality of edges thereof, said front surface having a plurality of protrusions thereon, each of said plurality of protrusions having an apex on a front surface thereof, said plurality of protrusions forming interstitial passageways therebetween for permitting transverse flow of water across said front surface of said drainage core;
• filter means for prevention of admission of earth particles into said interstitial passageways, said filter means being adhered to said apexes of said plurality of protrusions;
• means for waterproofing said back surface of said drainage core;
• and
• means for sealing at least one of said plurality of edges of said drainage core to an edge of a like adjacent drainage core, whereby a continuous waterproof surface is presented at said rear surface of a plurality of said drainage cores when said plurality of back surfaces of said drainage cores are placed adjacently against the subterranean structure, wherein said means for waterproofing said back surface of said drainage core comprises a flat peripheral flange formed on and as part of at least one edge of said drainage core, said flat peripheral flange being overlapped by a portion of an adjacent one of said drainage cores so that the front surface of said flat peripheral flange is brought into intimate contact with a portion of said back surface of said adjacent drainage core.