If shell construction or monocogue construction is utililized, CavaStop 300 can be applied by drilling in the foundation area, almost entirely through the thickness of both walls. Both walls in case of shell construction, must be drilled individually, (see side vieuw scetch) well above the foundation. If, sandstone, brick or concrete is used, utilize the table elswhere in this brochure to determine the quantity of CavaStop 300 needed! The thickness of the next wall will determine the amount required.