"The original bid was for EPDM," said Jim Walters, senior project manager for Chanen Construction. "The climate was the major factor in our decision to switch to a more reflective product, PVC."

 

Color was another factor involved in the selection of the PVC membrane. A tan membrane was selected for the project. "It was important for the roof not only to blend in with the overall color scheme of the building, but also with the Salt River/Pima-Maricopa Indian Community's logo which was painted on the roofing membrane," said Chuck Chapman, vice president of Classic Roofing. A fully-adhered UltraGard SR-60 membrane system was installed in order to facilitate the application of the logo.

 

The roof consists of three circular decks as well as angled corners and partial curved walls. The circular walls and half curves presented the biggest challenge for Classic Roofing. "By using a fully adhered system on the full circle decks, we were able to reduce the number of half sheets and not have as many seam laps," said Carl Hobe, the project manager for Classic Roofing. The main roof areas were mechanically attached.

 

The 150,000 square foot JM roofing system also consisted of isocyanurate tapered crickets and PVC walkways. It carries a 15-year NDL guarantee.

 

Both Classic Roofing and Chanen Construction, have been in business in Phoenix for many years. The Phoenix Office of Leo A. Daly was the architect. The Johns Manville representative on the job was Brian Dembowski and the technical advisor was Richard Ramirez.

 

Johns Manville is a leading manufacturer and marketer of premium-quality building products. The 142-year-old Denver-based company had sales of $2.2 billion in 1999. Johns Manville employs approximately 9,700 people and operates 58 manufacturing facilities in North America, Europe and China. Additional information can be found at www.jm.com