clear and present
Traditional architectural glass isn't clear enough for Mankins, which is why he uses PPG's Starphire Ultra-Clear. The company "removes the contaminant that historically makes glass green," he says. "This is truly clear." The low-iron product comes in standard and extra-heavy thicknesses. PPG Industries, 888.774.4332; www.ppg.com.
Substance Architectire
Paul Mankins, FAIA, LEED AP  
Des Moines, Iowa
www.substancearchitecture.com