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. Applicable Standards: ASTM C578, Type IV, ASTM C518, ASTM D1621, ASTM C272, ASTM E96, ASTM D696, ASTM C203, ASTM D2126, Meets IBC/IRC Requirements, ICC-ESR 4755, UL Classified D369, ASTM C1289, ASTM E84