Patent ID: 7284357

Claim:
A method of creating a barrier to fluid flow in discrete structures in at least one direction, one said barrier embedded within porous material in each discrete structure, each discrete structure incorporating a porous topmost section, said topmost section emplaced on top of sections of said barrier as a flowable mixture that hardens upon curing, said topmost section being of approximately the same composition as an underlayment immediately below said sections of barrier in each said discrete structure, comprising: applying to the top surface of said underlayment of each said discrete structure at least one layer of adhesive material, said at least one layer of said adhesive material to include a topmost layer of said adhesive material, said applying done to said top surface of said underlayment of each said discrete structure prior to emplacing said topmost section for each said discrete structure; placing said sections of barrier onto each said topmost layer of said adhesive material on each said discrete structure, said sections of barrier overlapping along edges of other said sections of barrier to establish a continuous array of said sections over each said discrete structure, each said section of barrier incorporating at least one layer of non-porous material, each said section of barrier having a total thickness less than about six mm, wherein each said array on each said discrete structure covers said topmost layer of said adhesive material on each said discrete structure; sealing all said overlapped edges of said sections of barrier on each said discrete structure; and emplacing each said topmost section of each said discrete structure upon said array such that each said array is confined below said topmost section and above said topmost layer of said adhesive material for each said discrete structure.