Insulatulating vans cause alot of controversy.
From what I've read closed cell insulation seems to be the most agreed on type along with a vapor barrier. I'm in the process of doing mine, I've gone for 50 & 25mm Celotex, expanding foam, and vapor barrier in the form of foil bubble insulation over the top.
There is many other options which people do use such as recycled plastic insulation but I would be concerned about it soaking up moisure. But I have seen this type of insulation used on Coach built vans.
Dan
From what I've read closed cell insulation seems to be the most agreed on type along with a vapor barrier. I'm in the process of doing mine, I've gone for 50 & 25mm Celotex, expanding foam, and vapor barrier in the form of foil bubble insulation over the top.
There is many other options which people do use such as recycled plastic insulation but I would be concerned about it soaking up moisure. But I have seen this type of insulation used on Coach built vans.
Dan