A Vergola roof that we have for the middle portion of our patio cover. It is an opening and closing louver system that closes automatically when it begins to rain. Then on both sides of the Vergola we have stationary slats so the whole back side of our house has a patio cover. We love the Vergola as we can choose when we want it opened or closed. Took us a long time to find something that would work well for us. Ours looks much nicer because my husband designed it with some curves.