STYROFOAM Brand SM Extruded Polystyrene Foam Insulation is a multi-purpose extruded polystyrene board that helps to meet the needs of the commercial and residential foundation and slab market. The closed-cell structure of STYROFOAM Brand SM Insulation resists water absorption, enabling it to retain a high R-value (RSI)* over time ? a necessary property in below-grade residential foundation applications.
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