Owens Corning R-8.7, 2-in x 2-ft x 4-ft 703 Series Unfaced Fiberglass Board Insulation Sound Barrier in the Board Insulation department at Lowes.com
2X4 PVC Foam Board 18mm for Cabinet - China PVC Foam Board, PVC Foam Sheet | Made-in-China.com
insulation - Rigid board installed after framing in Interior Basement Walls - Should I be concerned about trapped moisture? - Home Improvement Stack Exchange
Cut-and-Cobble Insulation - GreenBuildingAdvisor
2X4 PVC Foam Board 18mm for Cabinet - China PVC Foam Board, PVC Foam Sheet | Made-in-China.com
STYROFOAM 1" INCH FOAM SHEETS ( 2X4 SHEETS 18 FOR BUNDLE )
Walls With Interior Rigid Foam - GreenBuildingAdvisor
Three Ways to Insulate a Basement Wall - Fine Homebuilding