What did you insulate walls with?

[stowaways]

About 1/3 of the way through insulating with 1 1/2" rigid foam -- using AC foil tape to seal any seams or holes for wires. Approaching the ceilings and would love to use 1" which is easier to bend. This leaves about 1" between outer skin and inner skin. Stick with the 1 1/2"?

We're using Perma R Rigid Foam from Lowe's...

thanks!

[Wabbiteer]

especially on the ceilings - take advantage of a sealed airspace, the 1" - air space - then a flush-with-inner-liners layer of Prodex or the foil-bubble-foil insulation... any heat making through roof & 1-inch of foam would then have to fight the mirror heat bounce of reflective insulation? Cut the reflective stuff tight to ribs and tape to ribs, to lay flush with inner liners....?

[masseyfarm]

Why not put foil insulation on the inner and outer and the foam in between?
Reflectix Inc. | Products
You are only going to do it once!
Dave

[stowaways]

Interesting idea on the 1" ... Air space, then applying bubble wrap to back of skins. Since the ribs fit snug to inner skins, only need is for tape on ribs right? In lower sections we've used 1 1/2" foam with silver lining facing toward inner part of Airstream. Will be a pretty snug fit against inner skins since some of wiring is behind rigid foam ... Maybe 1/2" of space at greatest gaps. Looks good but wanted to double check. Thanks for input so far. We're new to this but it sure is cool knowing every inch of the thing...

[stowaways]

Some photos of the progress so far...
Riveted