Euro floor sandwich
I've been reading up on different structural floor materials for an eternity and have started to come full circle and hence back to marine plywood. I've got the samples and it all looks good. So now I'm focused on insulation and specifically I'm intrigued with how exactly the Euro Airstreams and brands like Vantage here in North America utilize the 48mm sandwich floors, (I'm visualizing a couple of skinny layers of luan stuck either side of some polysomething or other board). I'm assuming they don't have the shell attached through the floor to the chassis but I really don't know.
There's a few reasons I'm really attracted to an insulated floor rather than insulating under the floor and as a starter I was wondering if anyone had started with the traditional 5/8" or 3/4" ply floor and added a layer of hard insulation board, say 3/4" thick then another layer of ply say 3/8", all with adhesives or mechanical fasteners. Even typing it makes it sound a bit sketchy but who knows I just thought I'd throw it out there.
Let's assume I'm not bothered by anything under the floor freezing and that I believe insulation products have moved on since the 70's, just in case
1960 Sovereign 33' Pacific Railroad Custom