ReflectixBP48010 Double Pack Insulation, 48 in. x 10 ft (Fоur Paсk)

I used this on my RV windows on the Outside.. using aluminum tape and the windows went from too hot to touch to barely warm. AC in a RV can take 20 degrees off when it's over 100. Now I get a 35 degree drop in temperature.

Because of the curl when packaged into a box, the product wants to bow out.

Highly recommend

Used this on my metal shed and it works decent for how thin it is.Directly on the hot metal its a 10-15deg drop.It would work better if you could leave an air gap between material and wall in your application