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The good news is work has already be-


gun on the use of new building technolo- gies and systems to implement energy-ef- ficient solutions to these buildings. In fact, a number of federal agencies and depart- ments have stepped up their activities to set an example toward meeting new effi- ciency goals. Consider the following:


■ Executive Order 13514 was signed by President Barack Obama in 2009 to seek lower greenhouse-gas emissions in federal buildings of 28 percent by 2020.


■ The U.S. General Services Administration has established its high-performance building department to ensure all retrofit buildings feature sustainable design characteristics, including those that improve energy efficiency, optimize the use of potable water, manage storm- water runoff, and improve the interior comfort and air quality of the 500,000 buildings GSA oversees.


■ The U.S. Department of Energy remains focused on research into more energy- efficient building products, technologies and systems, including retrofit applica- tions. DOE’s Office of Energy Efficiency and Renewable Energy provides millions of dollars to improve materials, manu- facturing processes and supply chains for photovoltaic systems used in retrofit applications.


Even the U.S. Department of Defense,


which is the world’s largest consumer of energy, is taking a leadership role in energy, sustainability and retrofit solutions for the 2.4 billion square feet of building space it operates. By installing a test retrofit project at Goodfellow Air Force Base, San Angelo, Texas, DoD is learning how today’s roofing technologies can enhance its energy-efficiency goals.


The Mandates In 2007, Congress passed the National Defense Authorization Act, which requires DoD to produce or procure 25 percent of all energy from renewable sources by 2025. In addition, the federal government has man- dated DoD institute a 30 percent energy- use reduction on its properties by 2015 and another 37.5 percent reduction by 2020.


Through the use of the DoD Environ-


mental Security Technologies Certification Program (ESTCP), the military is providing grants to industry to demonstrate com- mercially available and sustainable novel technologies, products and systems aimed at meeting DoD’s energy- and water-con- servation goals. One such ESTCP grant was awarded


in 2010 to a team of metal construction- industry-leading companies and the Metal Construction Association, Glenview, Ill. The approximate $1 million grant is being used to demonstrate a retrofit metal roof system with integrated renewable energy technologies that showcases a holistic assembly of six different roofing system components. The ESTCP grant was awarded to this team in particular because the group offered the only retrofit metal roof- ing system integrating other energy-saving technologies to form a building envelope.


The Installation The project targeted retrofitting an 11,900-square-foot metal roof on a 10,000-square-foot Security Forces build- ing at Goodfellow Air Force Base. Prior to the installation of the roof


system, DOE’s Oak Ridge National Labo- ratory, Oak Ridge, Tenn., installed a data acquisition system to monitor various temperatures and heat information on the building. In addition to measuring energy data, the building’s utility billing informa- tion was collected. When the baseline of energy usage was established, installation of the retrofit metal roof system began in April 2012 and was completed in June 2012. The integrated technologies were in- stalled in the following manner:


■ Structural purlins were installed over the existing metal roof.


■ Additional insulation, using rigid insulation board, was placed over the existing roof to meet the current code requirements.


■ A waterproof roof underlayment was then applied over the insulation.


■ A radiant barrier was installed over the underlayment.


■ An integrated solar thermal system using a closed-loop tubing array with


September October 2012 // RETROFIT 33


Stackable and integrated roofing technologies that produce electricity, heat and hot water – for new and retrofit installations.


Is your roof ready for something exciting? Ask for “Building Integrated PV– Thermal”!


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