Architectural Record BE - Building Enclosure

Cool Roofs for Hot Projects

Using cool roofs to save energy, address global warming, meet code, and have the coolest project on the block.
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Sponsored by the Cool Roof Rating Council
Sherry Hao, Jessica Clark, LEED AP, Celeste Allen Novak, AIA, LEED AP, and Sarah Van Mantgem

With increasingly rigorous roofing code and standards, and promising technologies on the horizon, cool roofs are quickly becoming one of the most effective ways to obtain significant energy savings and environmental rewards. Cool roofs can be the simplest design measure to implement, in both new construction and existing buildings, without compromising project design or performance. Whether a project incorporates cool roof emerging technology or utilizes standard reflective processes, a designer specifying a rooftop now has several resources available to make informed and confident cool roof choices.

LEED Project-The King Abdullah University of Science and Technology-HOK

The design firm of Hellmuth, Obata and Kassabaum (HOK) designed the King Abdullah University of Science and Technology to be the first LEED certified project in the Kingdom of Saudi Arabia. It is also the largest LEED Platinum project in the world. The project features a 90,000 square foot cool roof combining the following materials:

  • White Ethylene Propylene Diene Monomer (EPDM) with an SRI of 84
  • Coated Metal with an SRI of 82
  • Galvanized Steel with an SRI of 46
  • Light Gravel with an SRI of 37

The project takes design cues from traditional Arabic architectural features developed in response to the harsh climate. These passive design strategies include a shading system that mimics traditional latticework screens called mashrabiya, natural ventilation through solar chimneys, and a compact, staggered building plan that allows building sections to shade each other. These features complement and magnify the cooling effects of the roof.13

Similar to the vernacular design strategies used on the University, cool roofs are not a new idea, being employed around history throughout the world from Greece to Bermuda.

 

ENDNOTES
1 http://heatisland.lbl.gov/CoolRoofs/
2 www.energystar.gov
3 http://eetd.lbl.gov/HeatIsland/EnergyUse/Overview/index.html
4 http://heatisland2009.lbl.gov/docs/231200-akbari-doc.pdf
5 http://eetd.lbl.gov/HeatIsland/CoolRoofs/
6 http://coolroofs.org/documents/
7 http://www.energycodes.gov/
8 http://www.energy.ca.gov/title24/
9 http://coolroofs.org/codes_and_programs.html NOTE: The list of city or state building codes requiring cool roofs, or offering incentives may change from the date this article was published.
10 http://www.consumerenergycenter.org/coolroof/faq.html#faqs-05
11 http://eetd.lbl.gov/HeatIsland/CoolRoofs/Overview/index.html
12 http://www.sciencenews.org/view/generic/id/57485/
title/Cool_roof_coating_Mechanism_kept_under_wraps
13 http://www.edcmag.com/Articles/Web_Exclusive/BNP_GUID_9-5-2006_A_10000000000000886986

 

The Cool Roof Rating Council
The Cool Roof Rating Council is a non-profit organization that maintains a credible, third-party rating program for measuring and labeling the radiative properties of roofing products. The Council publishes these ratings via its online directory as a public service for use by architects, code officials, building owners and other interested parties. www.coolroofs.org.

 

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Originally published in Architectural Record

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