Extruded hollow aluminum planks with interlocking mating surfaces "stack" on top of the sill plate. The plank is fully sealed horizontally. It weighs approximately five pounds per foot, so two workers can easily handle any IFCW™ plank (max. 20').

An interesting aspect to the design of the aluminum plank is that it fills with water as floodwaters rise. This achieves greater stability and "working weight". The plank weight more than doubles when filled with water. The internal baffle spanning the aluminum plank effectively doubles the strength of the component. Notice how the horizontal seal snugs onto the mating plank lips.