Cool Roof Colored Materials

May 29, 2003 - 12:00pm
Bldg. 90

Raising roof reflectivity from an existing 10-20% to about 60% can reduce cooling-energy use in buildings in excess of 20%. Cool roofs also result in a lower ambient temperature that further decreases the need for air conditioning and retards smog formation. Reflective roofing products currently available in the market are typically used for low-sloped roofs. For the residential buildings with steep-sloped roofs, non-white (colored) cool roofing products are generally not available and most consumers prefer colors other than white. In this collaborative project LBNL and ORNL are working with the roofing industry to develop and produce reflective, colored roofing products and make yhrm a market reality within three to five years.  For residential shingles, the aim is to develop colored-shingles with solar reflectivities of at least 35% to 40%.  Hashem Akbari, leader of the Heat Island Group, is a Staff Scientist in the Environmental Energy Technologies Division (since 1977).  He has performed research in energy use and conservation in buildings, advanced energy technologies, utility energy forecasting, advanced utility-customer communication, computation, and control systems, energy-efficient environment, air pollution control, and environmental simulation and modeling. He has led LBNL's efforts to investigate the energy conservation potential and environmental impacts of increased tree planting and modifications of surface albedo. In addition, his research has identified the attributes of these energy efficiency strategies to mitigating the urban heat island effect.

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