DuPont™ Styrofoam™ Brand Scoreboard ST-100 Insulation is a grey, extruded polystyrene foam insulation board that is scored longitudinally on 16" and 24" centers, making it easy to size to commonly used widths, cut and install. It has excellent insulating characteristics, high resistance to water and water vapor, exceptional compressive strength and long-term durability. Styrofoam™ Brand Scoreboard™ ST-100 Insulation is designed for use in exterior cavity wall and foundation applications. Like all Styrofoam™ Brand Extruded Polystyrene products, Styrofoam™ Brand Scoreboard ST-100 resists moisture to deliver a stable R-value over the long term.