here's my suggestion. we used this in the one barn/mini shop we resided and re-roofed 2 years go. keeps dust way down and it helped insulate it. No joke, it's usually 10-15 degrees cooler in side/ and 10-15 degrees warmer in the winter then outside.
Cool Shield Thermal Bubble Roll - 48" x 125', 3/16" S-9911 - Uline
