Owens Corning FOAMULAR® CI-C Extruded Polystyrene (XPS) Rigid Foam Insulation is a closed cell, moisture-resistant, durable rigid foam board intended for use under a variety of coatings including EIFS and Stucco systems. FOAMULAR® CI-C is classified as Type X / Type 2 product when tested in accordance with ASTM C578 / CAN ULC S701 and provides stable thermal performance of R-5 per inch. Removal of the as extruded skin surfaces provide smooth, flat, and parallel surfaces ideal as a base for coated surface materials. Like all FOAMULAR® XPS Insulation products, FOAMULAR®CI-C is made with Owens Corning’s patented Hydrovac process technology under strict quality control measures, which makes it durable, highly resistant to moisture, and permits the product to retain its high R-value year after year even after exposure to moisture and freeze thaw cycling.