Tom Ward, a principal at Ward + Blake Architects in Jackson, Wyoming, is taking sustainable building a bit literally; he’s built a structure out of plain old dirt. Holding the patent to EarthWall, a seismically-stable rammed earth construction process for sustainable building.
In 1999, Ward recognized an opportunity during news coverage of the aftermath of an earthquake in Turkey, where some of the homes -- those built from the region's indigenous rammed earth technique -- sustained less damage than the structures built with more modern methods. Ward eventually developed an innovative method of stabilizing the earthen walls with reinforced steel rods in a "rational structural post tensioning system" -- that effectively creates earthquake resistance in rammed earth structures.
"Fifty percent of the world's population lives in earthen houses, many of them in seismically active parts of the world," says Ward. "This strong, low-tech method could allow for the rebuilding of structures in areas ravaged by earthquakes -- or even for replacing existing structures to prevent future damage-without resorting to expensive, culturally foreign building systems."
Tests by the University of Wyoming's Civil Engineering Department confirmed that Ward’s technique worked as the first seismically stable rammed earth wall. In 2006, he received a patent on the eco-friendly building system that could help people in Third World countries construct earthquake-resistant homes. His innovative new-yet-old building technology won Ward + Blake a Newton Foundation research grant.
"The aspect that is most exciting to me," Ward adds, "is the potential for the worldwide application of EarthWall. Perhaps if the process is one day adopted in Third World countries, it will save not only homes from collapsing -- but lives as well."
Using the EarthWall process, Ward + Blake designed a 3000-square-foot residence, called the TK Pad Residence, which combines the earthen process with natural materials, applying specific roof design, addressing water runoff issues, and the house's placement on the land.
The forms of the house are generated by the EarthWall rammed earth walls that utilize a unique system of post-tensioning steel that was patented by the architects. The base material for these walls is native soil and crusher fines cohesively joined with Portland cement. The walls are 18 inches thick, and provide passive thermal resistance as well as acoustic properties, tempering the house from cold as well as pervasive highway noise.
The envelope of the house is simple and natural. The concrete has no color while the earthen walls are unadorned, with the natural stratification as the only embellishment. Exterior and interior wood are native species, treated with water borne sealers only. Concrete interior floors and exterior patios are natural color, and control joints are strips of slate.
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