Kingspan GG25-LG XPS Insulation Board comprises closed–cell Type IV extruded polystyrene (XPS) with a minimum compressive strength of 25 psi. Produced with a blowing agent blend for GWP of less than 50. It has high water resistance & an R–value of 5.0 per inch of thickness. It retains its insulating properties over time. Use this insulation for below slab, cavity wall, and foundation applications. Available in a square edge board, ship–lap edge board, pre-cut 16-inch wide board, and a score board.