Start With Climate and Use
A summer-only camper in a dry climate has different requirements from a four-season van used below freezing. Decide the expected temperature range and whether the van will be occupied for hours or days at a time.
Understand Thermal Bridges
Metal ribs, door frames and fasteners can conduct heat around insulated cavities. A build should consider the entire shell rather than only the large flat wall panels.
Ventilation Is Part of Moisture Control
People add significant humidity to a small van interior. Roof ventilation and controlled airflow are important even in an insulated build. Insulation cannot solve condensation by itself.
Avoid Trapping Water Where You Cannot Inspect It
Leaks can occur around windows, roof components and body seams. Preserve drainage paths where the vehicle design requires them and avoid creating hidden pockets where water can remain against metal.
Thickness Competes With Interior Space
More insulation reduces usable width and height. In a narrow van, an extra inch on each wall can affect bed orientation and aisle width. Model the finished wall thickness before finalizing the layout.
Install According to Material Requirements
Different insulation products have different requirements for adhesives, compression, temperature and moisture exposure. Follow the manufacturer’s installation guidance instead of assuming all materials behave the same way.
Turn the research into a build plan
The free guides on this site explain individual decisions. The Van Conversion Manual is designed to keep the major systems organized in one complete digital reference for the project.