16" x 125' Between Joist Insulation w/ Staple Tabs Foil/Double Bubble/Foil (166.63 sq. ft.)EcoFoil Floor Joist Insulation is engineered to reduce radiant heat transfer and help protect against moisture in floor systems and studded walls. Constructed with two layers of polyethylene bubble insulation bonded to reflective metalized surfaces, this material forms an effective thermal break while providing a vapor barrier when seams are sealed. With 96% reflectivity and only 4% emissivity, it minimizes the amount of radiant heat that can pass