Perhaps you’re thinking, “But, I already know what that is—the nifty device that keeps me from getting lost on the drive to a new job site.” True enough, but it is also the name of a new class of rigid foam insulation for wall applications—graphite polystyrene (GPS).
Available throughout the U.S. under various brand names, GPS integrates high-purity graphite into an expanded polystyrene (EPS) polymer matrix to enhance the insulation’s R-value. The result is a lightweight, thin product that is easily identified by its gray/platinum color.