After reading multiple blogs and info sites about Sprinter and van conversions, we decided to use metallic bubble wrap, fiberglass insulation, and a plastic vapor barrier.
In total, it took us about 2 days (6-7 hours a day) with 2 to 4 people working on this to finish the insulation process. It cost us about 300$ for the materials (although we got the fiberglass insulation for free from a friend).
DISCLAIMER: This is the first van conversion we are doing, so this is certainly a process of trial and error! We tried to describe at every step the reasons why we made the choice materials we made, so hopefully you can see that we used common sense to design this process. I am an industrial designer and design researcher and my boyfriend is a landscape architect with some knowledge in wood working. We see this project as an experiment and as a wonderful place to try out some ideas about design, materials and fabrication.
For an overview of the work we did, take a look at our timelapse videos!