Concrete Builds a Strong Case for Sustainability in New Model Home

The Concrete Home Building Council of the National Association of Home Builders (NAHB) is pleased to support the 2007 New American Home.  Each year, the NAHB constructs a new model home to display the latest in building technologies and design techniques.  The mission of The New American Home® program is showcasing high-performance structures with design elements suitable for projects from the most simple to the most complex.  The New American Home 2007 creates an efficient structure without compromising aesthetics, by incorporating the latest in cement-based products – the building material of choice for sustainable development. It features a wide array of energy efficient and sustainable design elements that streamline the construction process and create economies in the long-term maintenance of the home.  For the fourth consecutive year, The New American home makes extensive use of concrete products. 

Insulated Precast Concrete
The backbone of The New American Home® is an insulated precast concrete wall system that provides the structure with a solid thermal envelop.  Compared to wood and steel, concrete structures allow minimal temperature fluctuations due to its high thermal mass.  Consequently, heating, ventilating and air-conditioning can be designed with smaller-capacity equipment, saving money and resources.  The New American Home® will enjoy these benefits with precast construction, and to provide additional insulation, a continuous layer of Styrofoam is sandwiched between precast slabs throughout the structure for optimal energy performance.  Operating The New American Home® will require less overall energy for heating and cooling, significantly reducing the environmental footprint of the building over its life cycle.

TX Active
The most fascinating application used in The New American Home® is a building material with benefits that are invisible to the naked eye at first glance.  The exterior would appear to be the traditional cement-based stucco walls, which have long been known for their durable, beautiful, low-maintenance finish.  However, the stucco used in the New American Home® features one of the most revolutionary sustainable building applications in the world – TX Active – a new photocatalytic cement technology that is not only self-cleaning, but also has been proven to reduce air pollution. 

TX Active is a self-cleaning, smog-eating material that is manufactured by introducing admixtures, TX Arca and TX Aria, into the traditional cement mix.  The admixture TX Arca destroys pollutants that come into direct contact with the material, which will keep the building’s surface area clean without expending materials for building maintenance.  The admixture TX Aria breaks down airborne pollutants, such as smog, that pollute the air around the surface of the building.  TX Active will not only reduce maintenance to limit the overall energy footprint, but it will actually reduce the pollution in the air around the home.

Fiber-cement Siding
To complement the stucco and provide a durable exterior, the New American Home® incorporated fiber-cement siding as a low-cost, low-maintenance alternative to wood siding.  This sustainable application of cement-based materials has the appearance of wood, but none of the drawbacks of traditional wood siding.  Applying this attractive material to a building is one of the easiest ways to use cement-based products to fortify a home or business.  Approaching 10 percent residential market share, this fiber-cement siding will not rot, buckle or warp.  Fiber-cement siding also is proven to hold paint for a longer duration than wood siding and is resistant to termites and fire, a major consideration in many regions of the United States. 

Precast concrete walls provide additional energy benefits that do not show up on monthly energy bills.  By constructing the panels in a factory, less material is required because precise mixture proportions and tighter tolerances are achievable. This significantly limits waste from the construction process and consequently, lowers overall usage of materials for any structure built with this type of wall systems.  The pre-assembled panels also expedite the construction process, decreasing the number of labor hours necessary to complete the project.  This translates directly into a reduction of overall cost to complete precast projects.

Concrete Makes Sustainability Happen
The 2007 New American Home® demonstrates the versatility of cement-based products in the construction process and its many cutting-edge sustainable design applications.  Cement-based products play a key role in solidifying the structure of the building, as well as creating the home’s attractive outward appearance, while also significantly contributing to its sustainable features.

Sources:

Dow: Concrete Living, “Why STYROFOAM T-MASS Technology” http://www.dow.com/styrofoam/na/concreteliving/whytmass.htm  

Essroc: Products, “TX Active, the new photocatalytic cement technology for self-cleaning and pollution-reducing concrete, now available in North America.” 
http://www.essroc.com/default.aspx?pageid=216

U.S. Department of Energy, Building America: “The 2007 New American Home, Orlando, Florida” http://www.nrel.gov/docs/fy07osti/39426.pdf

The International Builders’ Show: “IBS Showcase Homes”  http://www.buildersshow.com/Home/Page.aspx?pageID=327 [ return to top ]