Which Roof Is Coolest?

ARMA, ERA, and PIMA collaborate to compare high-performance roofing systems in northern climates.


https://facilityexecutive.com/2014/12/coalition-formed-to-extend-research-on-sustainable-roofing/
ARMA, ERA, and PIMA collaborate to compare high-performance roofing systems in northern climates.
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Coalition Formed To Extend Research On Sustainable Roofing

Which Roof Is Coolest?

Posted by Heidi Schwartz

A coalition of trade groups is funding a research project on advanced roofing systems that were installed on an upstate New York correctional facility to evaluate the benefits of thermal insulation and cool roofing in Northern climates.

Onondaga County Correctional Facility roofs.
Roofs on four identical buildings at the Onondaga County Correctional Facility have been replaced with different styles of sustainable roof, allowing a comparison of the efficiencies of these technologies. (Photo: Onondaga County.)

The Asphalt Roofing Manufacturers Association (ARMA), the EPDM Roofing Association (ERA), and the Polyisocyanurate Insulation Manufacturers Association (PIMA) are sponsoring continued analysis of a reroofing project at the Onondaga County Correctional Facility in Jamesville, NY. The Onondaga County Department of Facilities Management identified a need to study building energy use and storm water runoff from roof systems

Temperature and rain data from the project, which includes vegetative roofing, increased insulation levels, and “cool” roofs, will provide information on building performance and roof covering selection.

“ARMA members promote a balanced approach to roofing performance, especially when it comes to saving building energy,” said Reed Hitchcock, ARMA’s Executive Vice President. “Using a whole building approach where roofing reflectivity, insulation levels, and other design elements are considered in the architectural decision making process will help ensure that the right system is selected; this project can only help with that decision.”

When the Correctional Facility was due for a major reroofing project in 2009, Onondaga County saw an opportunity to evaluate the water-retention and energy efficiency performance for a variety of different roof covering assemblies. The project also offered valuable information that could be used to identify the best options for future reroof projects across the County’s entire building inventory.

The County worked with Ashley-McGraw Architects (Syracuse, NY) and CDH Energy (Cazenovia, NY) to design and install a field-monitoring system to collect data on thermal performance, weather conditions, and roof runoff from four buildings at the Jamesville facility. CDH Energy released a report in October 2011 that made recommendations on roof covering selection. Hugh Henderson, P.E., of CDH Energy remarked that the original report laid the groundwork for future roofing projects in Onondaga County.

“The use of vegetative roof systems as a storm water control mechanism was the most important takeaway from the first years of the project,” said Henderson. “Continuing the project will provide a better evaluation of cool roof and insulation products as part of roof designs in colder climates.”

With the instrumentation still in place, it was a simple decision to continue evaluating the roof coverings over a longer time period to better see how roof coverings interact with weather conditions. Of particular interest is the effect of accumulated snow on roofs that may affect the buildings’ thermal performance.

“Roof insulation is an integral part of the design strategy for a building’s energy efficiency footprint, and this study will help building owners, contractors, and architects assess a roof’s performance from a broader basis and ensure that the best energy efficient components are used,” said Jared Blum, PIMA President.

“This study will provide meaningful data that can help designers select the right products for their particular project, regardless of where in the country the roof will be installed,” said Ellen Thorp, associate executive director for the EPDM Roofing Association.

The project is expected to run through 2015.

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