4-inch Type 4 XPS Rigid Insulation 2-ft x 8-ft

Dupont Styrofoam Type 4 XPS Rigid Insulation 4-inch x 2-ft x 8-ft. R-Value of 20.

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.

8 sheets per bundle.