Volclay Panels are special 4-ft by 4-ft corrugated kraft boards that contain 1.0-lb. of sodium bentonite per square foot in the flutes of the board. Once installed, the corrugated kraft board biodegrades and the bentonite hydrates and forms a seamless waterproofing membrane on the exterior of the structure. Volclay Panels offer a reliable, low cost means of providing a waterproofing system that is both effective and environmentally sensitive.