1-1/2"-4X8 **25-PSI** BLUE DUPONT STYROFOAM(TM) SE R-7.5 | 1-1/2"-4' x 8' Square Edge R-7.5
Styrofoam™ Brand Square Edge Extruded Polystyrene Foam Insulation* is an extruded polystyrene foam (XPS) insulation board that meets the needs of the commercial foundation and building floor slab market and can also be used for attics, foundations/slabs and crawl spaces in residential applications. With more than 60 years of proven performance in wet environments, the closed-cell structure of Styrofoam™ Brand Square Edge Insulation resists water pickup, enabling it to retain a high R-value** over time - a necessary property in wet, below-grade commercial foundation applications. Styrofoam™ Brand Square Edge Insulation is classified as a Type IV product when tested in accordance with ASTM C578 and provides a long term insulating performance of R-5 per inch
"R'' stands for resistance to heat flow. The higher the R-value the greater the insulating power.