Step 1 Assemble the Parts for the Bottom, Top, and Middle Frames
The bottom frame is the sill upon which you build the entire shed. For now, assemble the front, back, left, and right frames separately, then set them aside. The main frame on this shed is a right angle, called a wall angle, which goes around the top of the walls and reinforces them. The middle frame is called a wall channel and is attached to the walls midway between the floor and roof. You will have a wall angle and a wall channel for each wall. Put them together and set them aside for now.