After picking up grain this morning I stopped at Home Depot and purchased 5 sheets of 2 inch thick, 4x8 ft rigid insulation. This is the main insulator for the cooler, but the moisture barrier and the metal faced office partitions should get me into the r20+ range. The foam is r10 by itself.
Now that it is going to be triple digit heat I need to work inside during the mid day so this is the perfect project.
Steepshot