Over the past week, Envinity installed the roof trusses to the GreenBuild homes. Similar to the walls, the roofs use ZIP panels to combine the sheathing and the weather resistive barrier into one building element. The interior framing use a combination of construction techniques. The previous post described the Optimum Value Engineered wall framing; the second floor structure uses open-web trusses with 16″ spacing while the roof uses manufactured trusses with 24″ spacing. The second floor structure is closer together to provide a bit more rigidity to the floor.