$56.99 Dural Durabase XPS 32 in. x 48 in. x 1/2 in. Foam Backer Board Underlayment (Package of 9 - 96 
Blue Board 1 1/2 x 4 x 8' - 7.5R Value - 25PSI in 2020 | Basement insulation, Foam insulation 
R-Tech 1-1/2 in. x 4 ft. x 8 ft. R-5.78 Rigid Foam Insulation-320817 - The Home Depot
