That doesn't seem like it would have any R value whatsoever, you want something more along the lines of - Reflectix BP24050 24-Inch-by-50-Foot Bubble Pack Insulation https://www.amazon.com/dp/B0009XCJA2/ref=cm_sw_r_awd_coshwb6R8CKGZ but that is only by using my common sense and some quick research, I don't have any direct experience with it.