Extruded polystyrene (XPS) •Easily recognized by its blue, green, or pink color •Falls in the middle of the three types of rigidfoam insulation in both cost and Rvalue •Used most in walls or below grade applications •Recyclable, and at about R5 per inch, costs around 42¢Shop Owens Corning R30 Attic 5867sq ft Faced Fiberglass Batt Insulation (16in W x 48in L) in the Batt Insulation department at Lowe'scom Owens Corning PINK Next Gen Fiberglas insulation installs faster because it's made like no other fiberglass insulation PINK Next Gen fiberglassThe Importance of Insulation Thickness RValue isn't just a time measurement though It takes into account the size of the sample and the overall change of temperature over time, so that you can compare thermal conductivity of materials tested with plates of different temperatures, or even that were tested by other methods
R30 insulation thickness