2TheStreet
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akrvbob said:How much you put on depends on your budget and how warm you want it to be inside. There really is no right or wrong answer except the more you put in, the more heat it will keep inside.
The one issue to consider is that the thin piecess are more flexible and will bend with the curve of the wall or ceiling. I used 1 inch styrofoam on the walls of my cargo trailer because they are flat and didn't need to bend. On the roof, I used three, 3/4 inch pieces because they would curve to the arch of the roof.
You actually want the most on the roof because heat rises and goes out the roof fastest. But, it's a trade-off with headroom so use the most you feel comfortable losing headroom.
Bob
Hone depot has a set that comes with 8 of polystyrene foam panels (Marketed for a garage door), it has slits in the them that make it easy to bend. However, the thickness is 1-1/4". Panel size is 54" x 20" x 1-1/4". Only $58