$52.99 R-Tech 1-1/2 in. x 2 ft. x 4 ft. R-5.78 Rigid Foam Insulation-321355 - The Home Depot
Rmax R-Matte Plus-3 R3.2 Faced Polyisocyanurate Foam Board Insulation (Common: 0.5-in x 4-ft x 8 
Enerfoil - Foil Faced Rigid Insulation - Polyisocyanurate Board - IKO
