Kingspan GreenGuard XPS LG Insulation Board is comprised of closed–cell extruded polystyrene (XPS) with a minimum compressive strength of 25 psi. Produced with a blowing agent blend that has a GWP of less than 50. It has high water resistance and R–value of 5.0 per inch of thickness. It is available in a square edge board, ship–lap edge board, pre-cut 16 inch wide board and a score board.