under roof insulation
Reflective roof insulation should not be placed above the ceiling, as it is a conductive surface with the same properties as the cable. In addition, when the reflective surface area is dusty, the efficiency of the reflective surface is reduced, so in the long run, it is more effective to place reflective insulation under a roof that is less concentrated on the reflective surface.
Green Roof Insulation Features
Silver bubble wrap insulation is usually placed under the metal roof. The sheets are tightly fitted together and sealed or caulked to maximize thermal resistance. It is denser and thinner than other metal roof insulation options, so it reduces joints and gaps during installation, which reduces air leakage.