The wall consisted of wood, concrete, rebar, insulation, and various types of exterior decoration. The rebar is a steel reinforcing rod in concrete.This unit is important because it shows how tall the house has to be, and how the foundation will be laid out. I also had to use the scale a lot more than usual in order to get the measurements of my sketch. Since I was a bit confused by the videos, and the house used in the videos was not the same as mine, I had to free hand the sketch by using the measurements from the scale so the scale ruler was an essential piece in this unit. The sill plate is another material used ,which is the bottom horizontal member of a wall. Then there is the sub floor which is the foundation for a floor in a building. These materials can all be found in the S layer of AutoCad.