Nestled in the Ozark Mountains of rural Missouri, Pensmore is on track to claim bragging rights as one of the world’s largest private homes upon its completion in 2013. This chateau-style mansion will have 72,000-square-feet on more than 500 acres of land. Its owner, Steven Huff, chairman of TF Concrete Forming Systems, wants Pensmore to be the first major energy efficient, environmentally sustainable single-family residence of this caliber. The home’s concrete shell is reinforced with “Helix” steel fibers by PolyTorx. The twist-shaped fibers will act as an added guard within the structure against tornadoes and earthquakes.