ETW: Foundation - 2" Polyisocyanurate Insulation, 2x4 Framing with Cellulose | buildingscience.com
Rigid Foam Insulation
Polyisocyanurate Board Insulation at Lowes.com
Plus 3 - 1/2 in. x 4 ft. x 8 ft. R-3.2 Polyiso Rigid Foam Insulation Board-754404 at The Home Depo… | Rigid foam insulation, Foam insulation board, Insulation board