[Wanderman]

Looks like the OSB wood that has disintegrated is below a piece of foam insulation board, the blue stuff.

I'd like to know what thickness it was and how all the layers attached together and then screwed into the steel frame edges above it. Looks like the frame squeezes the layers together and then the frame itself screws to the steel above and then there are through screws with big washers holding up the center and a few other places. These likely just went into the wood... I am NOT completely sure and do not want to have it fall while driving!