The progress continues! Take a look at this...
Above you'll see 1 inch of XPS foam covering the entire floor. We thought about going thicker, but ultimately want to save the headroom. I'm about 6'1" and with about a two-inch total floor and a ceiling that extends a 1/2" beyond the 1 1/4" ribs, I'll still have about an inch. Our bus is tall inside, and I'm happy I won't have to stoop. We may need rugs for cold feet in the future, but that'll be good enough for now!
Grammarly wants me to change rugs in the last sentence to drugs. That would help too, I'm sure
Next we have...
After much deliberation, we went with 3/4" (23/32") Advantech by Huber Engineered Woods. It's a special OSB that is made the whole way through with a water resistant glue. We were sold after seeing that every local contractor swears by it for never absorbing water or losing shape. The stuff is solid as a rock. Much higher quality than anything else available at our local stores, INCLUDING the plywood. We wanted something very rigid because we chose not to frame the floor and just lay directly over the foam, inspired by Jazty.
Here's the final product:
The floor is incredibly sturdy. No give at all, and best of all, no squeaks! Unbelievably happy with how it turned out. Mistakes were made and it isn't the best skoolie floor ever, but it is GOOD ENOUGH
One last note, this is how I feel when entering the hardware store now:
We're approaching the point where there is more PL Premium on the bus than steel...