Bubble Foil works as a great under layment, moisture barrier heat reflector,and insulator. For many contractors the Bubble Foil is there choice product to install under there new Metal Roofing System, and home owner or business owner enjoy it’s many qualities. Some use it under siding in place of house wrap or as insulation for pull barns. There are different opinions to the actual R value of the bubble foils products. They say the R value is between 1 and 14 depends on who is doing the studies the manufacturer or the competition. But what ever the R value really is the bubble foil product makes a big difference. There is a local Amish shop that is close to 10,00 sq feet and is insulated with only double bubble foil on the ceiling and wall, they have been able to heat it on the coldest winters were we have had temp close to 0 F or -18 C for day, and they were able to keep it heated with two small coal stoves.