These are self made and cut, 1.50" thick X 4.00" Wide X 96." long, Dow Styrofoam planks to be used as insulated fillers in a (self-made) steel 2x4x96 insulation plank- holding tray. These planks will be pressed into the open channel of each 2x4 , that have been glued together (liquid nails) in parallel, to form the insulation holding tray.
On the right, is the steel 2x4x96 insulation plank- holding tray. The trays outer planks have noticable slots cut from them to accomodate the buses various underside supports and structual architecture that had to be contended with first in the design and construction phase first. in later pictures I will reveal the hows and whys of of such gapping slots. Off to the left of the insulation tray you will see a solid panel of 1.5" thick Dow polystyrene, cut to the same exact dimensions as the insulation tray. This will lay upon the top insulation tray when future mounting occurs from underneath the bus, laying on the ground looking up. There will be 4 layers of 1.5" thick insulation = a total of 6.0" when complete. in a discription of what layers are to be applied in what order, consider the buses floor to be the starting point looking upwards from underneath while laying on your back, looking upwards. So,...layers #1, would be on and directly touching the buses outdoors-underneath floor surface.(that surface that faces downward and faces the street surface....next, would be applied layer # 2, acting as a filler layer to achieve enough insulation to allow the insulation to protude beyond the floor joist and floors-framing architectural valleys.This is a necessity in order to allow for the "solid panel of 1.5" thick Dow polystyrene", (which is,Layer # 3 of ...4 as mentioned earlier above) which is to be applied overtop layers #1 & #2, to prevent any drafty-air-gaps that might allow heat penetration upwardly, in the summer or or Seeping out, of A.C. losses, at the same time. then Lastly, the insulation tray will be applied over #'s 1, 2, & 3...creating a solid hard and durable ecto-skin for protecting and supporting the soft and vunerable insulation package.