Ok we are ready to go to the next step with the interior of the bus while we are getting the outside sanded and otherwise prepped for painting. I am conflicted between getting things right the first time and not making extra work for myself. I am going to get those big rectangular tie down cleats on the ceiling. I am thinking I will leave the ceiling alone, and just paint it white. I am going to use the slightly upgraded version of Henry's SolarFlex on the roof for additional insulation.
I have two questions:
First question: I have holes in the floor where rust has eaten away the steel. I also have large circular holes where the tie down cleats were riveted directly into the floor. I have been advised to put down some sheet metal after Ospho treating and then rusty metal priming. I have been thinking of laying wooden support strips with insulation foam board between, then a layer of plywood and then vinyl (needs to be easy to clean a sanitize). Do I need to do something more to seal the two layers of steel? Im concerned that moisture is going to get between the two layers and make a nice rust pocket.
Second question: I am trying to decide to leave the skin and put foam board insulation between furring strips to attach the new walls which will be FRP panels (lazy, easy way). Or pulling down the skin to put two new layers of foam board insulation, otherwise the same way. HEAT insulation is the big concern here in Houston.