With the use of a 320 dollar infra red imager I was able to apply this product (13/64ths) foil foam in layers and man it really stacked up. My studies show that if you use this product, the (foil foam) in layers that R values of 125 can easily be had within a 2X6 wall cavity and you cant spray foam a 2 by 6 inch stud with anything known to achieve a 125 R value. And 7 to 8 layers in the wall yielded an impressive R value of between 65 and 70. The comfort alone is worth every dime. But on top of it our house stays more moist in the winter time and was the first time our skin was not dried and itchy and no nose bleeds. I'm glad I took the time to do research on this product. From an energy efficiency stand point it is one of the best products ive every used. And lastly mastering its uses can be life changing it is not an exaggeration the thermal imager don't lie