Under floor insulation??

[jcanavera]

I know that Airstream used a foil/fiber glass product on the slide outs. Reason being that were able to get the equivalent R value rating with that product with less thickness of typical fiberglass batting. The slides has some space restrictions under floor due to the slide. I personally haven't seen it on mine but I did do the factory tour back in 2001 when slides were being produced and our tour guide informed me that there was a different product used underfloor for those models.

Jack