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InsulFoam I Below Grade is an engineered insulation consisting of a superior closed-cell, lightweight and resilient expanded polystyrene (EPS). InsulFoam I meets or exceeds the requirements of ASTM C578, Type I, Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation. InsulFoam I has a nominal density of 1.0 lb/ft3. In addition, InsulFoam I offers a long-term, stable R-value and has excellent dimensional stability, compressive strength and water resistance properties. Insulfoam Below Grade Insulation can contribute toward environmental credentialing including LEED® credits.