Originally Posted by ol trunt
Should not crush with 1/2 " plywood on top to spread the weight--did I miss the plywood somewhere in the discussion?
I agree it will not crush with the plywood on top of the foam board, If you just put foam board down it will crush.
I plan on using the 1/4" pink board sandwiched between some house wrap and under the 5/8 tongue and groove plywood. I wanted tongue and Groove as I dont want the floor to move as you walk across it, I want it to be like one very large one piece of plywood.
I'm wanting the same from my bus. Handle all kinds of weather from summer desert to the Mountains in the winter. However I was going to put down Carpet everywhere except the Kitchen and Bathroom where I was putting some vinyl tile that I got from Home Depot. This stuff comes three tiles long and sticks together but not to the floor, it wears great. All this was going to sort of float, except the walls were going to be attached to the metal sides of the bus and a short screw to go through the sill plate and into the plywood floor just enough to keep the wall rigid.
I as little as possible to penetrate the steel floor because that is the only place my bus rusted, where the old seat bolts went through the steel floor. Where I have to go through the floor for plumbling and electrical, I was going to tar/seal the heck out of it.