This dude says USEAL is better than peel n seal:

I want to insulate my van and I will be using this seal and some reflectix.

 

I've posted up in the recent spray foam thread about my experience with regular old pink fiberglass residential insulation. Tried and true for 5 years plus. I sleep in it in all weather, comfortably I may add.

Basically, split it for thinner wall, mount it with bailing wire, skin with 1/8" ply. Glue carpet on ply if desired.

 

The Spray Foam thread, is that how it's now known as?

It's good to hear you don't have moisture issues. But personally I think it's better to use Roxul. You'll have fibreglass constantly in the air with your system no? Although you do have the advantage of weight savings, the particular Mineral Wool I used is heavy.

One thing though.. you go through all that trouble insulating, yet you left the pockets in the ribs empty. I am not against foam, I am only against the particular foam I used. I'd do the same over again, only this time I'd have used "Window and Door" foam. It's much more forgiving. I also wouldn't have sprayed the "vent".