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Innovative Roof Coating Provides Energy Savings - Posted 11/28/07

November 28, 2007
Rohm and Haas has updated the roof of its nine-story global headquarters with an advanced polymer elastomeric roof coating that reflects a broad spectrum of UV, visible and infrared light and emits nearly 90% of any absorbed heat, all of which contribute to the degradation of traditional roofing materials and the energy consumption of buildings.

Rohm and Haas has updated the roof of its nine-story global headquarters with an advanced polymer elastomeric roof coating. The company has occupied the building at Sixth and Market streets since 1965, but over the past year, the company set out on a floor by floor renovation to revitalize their headquarters. The contemporary concrete, steel and glass building was designed by the late Pietro Belluschi, a leading world architect who served as dean of MIT's School of Architecture and Planning for 14 years, and has recently been granted Historic Landmark Building status. The innovative roofing system will cover the current black rubber membrane roof with a crisp, white, highly protective and reflective material.

“Elastomeric roof coatings are one of the main thrusts in our environmentally advanced portfolio,” says Colin Gouveia, marketing director for Industrial and Construction, North America. “By helping to reduce the urban heat island effect by providing a cool, reflective surface, elastomeric coatings are a sustainable technology that demonstrates the way people need to think and act in regard to the environment.”

The city of Philadelphia is currently seeking to increase standards for new and replacement roofs above the current state building code. The new Rohm and Haas roof coating exceeds the current state regulations and would meet the proposed city regulations, should they be adopted.

According to Javier Banos, marketing manager for the company’s elastomeric coatings division, the new elastomeric roof coating reflects a broad spectrum of UV, visible and infrared light and emits nearly 90% of any absorbed heat, all of which contribute to the degradation of traditional roofing materials. It also protects against expansion and contraction cracks in the roof, which lead to roof deterioration and leaks, because it is elastic and can bridge cracks that form as temperatures fluctuate. “The result is a cooler and longer-lasting roof, lower air temperatures and energy savings for the entire building,” says Banos.

“The lower roof of our building is EPDM [ethylene propylene diene monomer], a thick, rubber membrane-type black roof, and the upper roof is a traditional built-up (asphalt) roof with a smooth APP Mod-Bit Capsheet,” explains Lou Velez, P.E., Rohm and Haas building manager. “We are coating both surfaces with two thick coats of elastomeric product to prevent ultraviolet degradation. That coating also adds an extra layer of impermeable material, so water runs off readily and not into the building structure where it could cause damage.”

Rohm and Haas expects significant energy savings between May and October, based on the way the building’s air conditioning system is configured. “The air intakes are at roof level,” explains Banos. “Currently, the system has to bring in the hottest air and work harder to cool it. By lowering the air temperature around the intakes, we will lower the amount of energy needed without having any effect on the comfort level of the occupants.”

Not only does an elastomeric-coated roof save energy, but it reduces landfill waste and provides substantial savings in maintenance and replacement costs. Roof repair used to mean tearing off the aging roof and replacing it, but with proper maintenance, elastomeric-coated roofs can last much longer than traditional roofs. Such maintenance is limited to occasional cleaning with a hose or power washer and reapplication of the coating on average every 7 to 10 years.

The summer cooling offsets any heat gain by a black roof in winter more than tenfold, among other reasons because the potential for heat gain is so much lower during the winter when sunlight is much less intense than during the summer. The project includes monitoring devices that will enable Rohm and Haas to track energy savings.

For more information about elastomeric roof coatings, visit www.rooftopics.com.

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