The floor of the bus is corrugated, so in order to put down a floor, the valleys need to be addressed. In this case, some Kilmat sound deadening was applied first. Then strips of Thermoply to bring the valleys even with the tops. Lastly, another layer of Thermoply covers the top before a layer of plywood flooring. The right side of the bus is also insulated with R Max to complete the insulation work. A ton of work, but the end product is a cool and quiet floor, and the walls of the cabin are in good shape to better mitigate the outside temperature.