#2241 • (16) 4'x4' EnergyGuard Ultra Taper Z Insulation Sheets Part of GAF EnergyGuard Polyiso Insulation: 4'x4' and 4'x8' (163709) (timed auction by Bid-2-Buy) Status: Sold 2.5" - 3.5" 25 PSI (16) Pieces = 256 Sq. Ft.