Patent ID: 8307587

Claim:
A construct for making a drainage device for a basement waterproofing system; said construct comprising a sheet roll of waterproof material that can be unrolled and cut to provide a sheet having a length defined by the amount of material that is unrolled, and a width defined by the width of the roll, said sheet having a top surface and a bottom surface and two generally parallel sides; wherein said sheet includes a series of longitudinal slots substantially parallel to and nearer one of said two sides, and wherein the other of said two sides includes a series of tabs sized and positioned to be received in said slots and extending upward above the top surface when said tabs are received in said slots; wherein one of said top surface and said bottom surface is scored along its length to facilitate folding the sheet in three folds to construct to a rectangular tubular shape construct having open ends; wherein said sheet includes a plurality of perforations sized and positioned to be effective for allowing water to flow easily through three of the sides of the device when folded to its rectangular tubular shape.