#2313 • (12) 4'x4' EnergyGuard Taper Iso Panel ZZ Insulation Sheets Part of GAF EnergyGuard Polyiso Insulation: 4'x4' and 4'x8' (163709) (timed auction by Bid-2-Buy) Status: Sold 3.5" - 4.5" 20 PSI (12) Pieces = 192 Sq. Ft.