rFOIL Reflective Insulation 2200 Series underlayment in an energy efficient barrier that can reduce transfer of radiant heat through roofing. The 2200 Series underlayment’s polyethylene bubble material, sandwiched by a layer of metalized foil and a white polyethylene sheet, provides an added R-value of 1.1. When there is an airspace between the 2200 Series underlayment and the metal roof, the system boasts an R-value of 4. While most insulating materials/underlayments rely on retarding the flow of heat through walls and ceilings, the 2200 Series underlayment works by reflecting as much as 96 percent of the radiant energy, reducing energy costs in air-conditioned homes and buildings, as well as creating an effective shade in non-cooled outbuildings, garages, porches and utility buildings. It can be taped to purlins, stapled to rafters or studs, or rolled out on roof decking or existing shingles prior to installation of metal roofing or siding panels.