4-inch Type 4 XPS Rigid Insulation 2-ft x 8-ftDupont Styrofoam Type 4 XPS Rigid Insulation 4 inch x 2 ft x 8 ft. R Value of 20. Compressive strength of 30psi. 8 sheets per bundle. DuPont Styrofoam Brand SM30 Extruded Polystyrene Foam Insulation is ideal for use in foundations, floor slabs, attics and crawlspaces, where it resists water pickup a characteristic that allows it to maintain its high R value.
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