$62.99 Super TUFF-R 1/2 in. x 4 ft. x 8 ft. R-3.3 Foam Insulation-268413 - The Home Depot
Owens Corning FOAMULAR 1/2 in. x 4 ft. x 8 ft. R-3 Squared Edge Insulating Sheathing-36L - The 
Shop Rmax Polyisocyanurate Foam Board Insulation (Common: 1-in x 4-ft x 8-ft; Actual: 1-in x 4 
