Get this Poly Shield R-5 Rigid Insulation – EPS delivered onsite. Poly Shield® is made of premium expanded polystyrene (EPS) rigid insulation that meets or exceeds the requirements of ASTM C578, Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation. The EPS is composed of closed cells with excellent dimensional stability, compressive strength, and water resistance. Poly Shield® is faced with tough polymeric laminates on both sides for added strength and durability in storing, handling, and installation.