R-Tech® IV is an engineered rigid insulation developed to be an alternative equal in applications where Type IV extruded polystyrene (XPS) is specified. R-Tech IV consists of a superior closed-cell, lightweight and resilient expanded polystyrene (EPS) with advanced polymeric laminate facers. The core of R-Tech IV is the same high-quality EPS as our InsulGrade insulations and meets or exceeds the compressive strength, flexural strength, dimensional stability and water absorption requirements of ASTM C578, Type IV, Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation. R-Tech IV is available with factory laminated metallic-reflective facers, white facers or a combination of the two. In addition, R-Tech IV offers a long-term stable R-Value, is an energy-saving insulation.