After 18 years of exposure to extreme desert heat, the roof
system on the Nationwide® Scottsdale Insurance Co. headquarters
building in Scottsdale, Ariz., began to deteriorate. The
maintenance staff had been chasing leaks for nearly five years when
Nationwide Scottsdale Insurance decided to hire Alan Stevens
Associates Inc., Cedar Rapids, Iowa, to solve the problem and
replace the roof system.
The building's original roof system was a ballasted EPDM
membrane over 4 inches of polyisocyanurate insulation on a concrete
roof deck blanketed with a 2-inch-thick layer of river rock. The
roof system was becoming a liability with regard to structural
integrity (from water damage), maintenance costs and energy
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