Now that the paving and wall raising is complete, the trusses have been delivered.   Just as the walls were, the trusses are laid out in the parking lot and moved in place by the lull.  The crews are also using the back section of the building to make any last minute adjustments to the trusses before they go up. The trusses are composed of triangles because of the structural stability of that shape and design. A triangle is the simplest geometric figure that will not change shape when the lengths of the sides are fixed.