Construction: Reflective aluminum foil facing insulation: Aluminum foil: 7Microns / Polyethylene / Tri-Directional Scrim / Kraft 60gsm/ Polyethylene / Foil: 7MicronsApplication:Doublesidedaluminum foil facing insulation is mainly used under roof decking,under attic rafters, over existing attic insulation, in floors, walls andcrawl spaces, and in industrial and commercial buildings as radiant barrier to block radiant heat coming into house through the roof during the summer and retain indoor heat generated during the winter.FSK facingused as a water vapor barrier in air conditioning ductworks and cold rooms. Benefit: Double sided aluminum foil insulation provides high tensile strength and neat appearance, can reflective the radiant heat from the heat source(such as sun) more effectively than single sided aluminum foil insulation. Aluminum foilfacing does not contain hazardous chemicals or harmful materials that cause itching or respiratory problems. Foil srim kraft as a radiant barrier stops up to 97% of radiant heat transfer which improves the performance of the insulating material Fiber glass scrim reinforced for strength and durability. Alu foilfacing provides an efficient, space saving, and healthy method of temperature control and energy savings. Roll Size: Roll Width: 1.2M, 1.25M, 1.3M Roll Length: 40M, 60M etc.