Van Conversion Best Van Insulation Part 1

What is the best van insulation for campervan conversion? We explain all types of van insulation and install van insulation in our van conversion.
Van Conversion Best Van Insulation Part 1

We decided to go for recycled plastic loft insulation, as it was non-irritant and easy (ish) to work with. Filling the rectangular gaps in the majority of the van – easy peasy. Filling the hidden cavities and columns? – Not so easy… For the giant window and back door cavities, we will be using PIR board, but we’ll save that for next time.


We used recycled plastic insulation rolls for our insulation. These are a non-irritant (so you can touch them without scratching your skin) and are easy to work with. We measured all the smaller cavities in our van, went inside and got measuring.

Although it seemed easy to cut through, it wasn’t that easy. Hair cutting scissors did the best job ✂️ but it still took a few blisters and many hours to slice it all up.


With all the simple rectangles cut using our trusty Sprinter layout planner to make short work of all the measuring, it was as easy as matching the size to its location in the van. Some took a bit of stuffing, and some needed to be split in half, but overall, relatively easy job.

We didn’t stick them in with glue in case we needed to remove them in the future.

van conversion soft insulation
van conversion soft insulation


As for all the columns and air holes in the rest of the van, it took a bit more figuring out. For the columns, we tore long strips and used a bamboo rod to stuff it up the columns, which sort of worked, although who knows how far it actually went up. 🤷

As for other areas, some required odd shapes to be cut and pushed into place. Others required us to break apart the insulation into clumps and poke it in through tiny holes with bendable metal rods or fingers.

Breaking it into clumps actually proved very effective for all of the hard-to-reach places. Next time we wouldn’t even bother going for long tails and just stuff clumps up there instead.

We knew we would never be able to fill every single airhole, but it’s best to try and do as much as possible.

van conversion soft insulation
van conversion soft insulation

top tip

You should not be tempted to stuff more insulation than is needed. The insulation compresses very well, but the air inside the insulation is what helps give it thermal properties, so compressing it too much will actually work against you. You want it puffy. ☁️


We also insulated our sliding door and back door, including removing any panels we could to stuff insulation everywhere. We did our best not to put insulation where there were a lot of cables in case we needed to replace any in the future.

PIR Board will fill the big window cavities on the sides as well as the back door window cavities, since this has better thermal properties and is rigid, so we left those empty for next time.

van conversion soft insulation

quick look

  1. Cut the insulation to size
  2. Fit into holes
  3. Stuff more into all available gaps, including doors


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