Click on the image or link to get what you want.
Before anything else… consider using jute. It’s 100% natural and it’s what Lou and Dana stuffed into the walls of their van Ody.
If not, then you could use, for example, Ecotherm against the roof and floor. You can order it on Amazon to get it sent to you:
2400 x 1200 x 25mm Celotex TB4025 / Kingspan TP10 / TF70 / Ecotherm Ecoversal Foil Insulation
Important to know is that you may need to have a small air gap between the insulation material and the van wall. You’ll likely have to use timber to achieve that (to fix the insulation material to and create the air gap). It depends on what kind of material you use. You need the air gap if you use reflectics. Ask Ben!
If you prefer professional instructions on how to do it all, here are some:
by and with LOW-E reflective insulation
And here is the important vapour barrier you will need (though some insulation materials will have it built in):
One more thing. If you ever see me write about “isolation” when I clearly meant “insulation”, please forgive me. It means that my mother tongue tripped me up. It uses the same word for both concepts, and that word is very close to “isolation”.
Did you know that the English language – which has a much bigger vocabulary than my mother tongue – also has the word “insolation”? That’s about incoming solar radiation, which is important for your solar panels, but you don’t usually have a heck of a lot of influence on that in van life.
Though these lads have a few tips on that, LOL.