Hi Catulito, Thanks for your great comment and question. The roofing product is a clear corrugated roof sheeting called Alsynite. There are several products available. It works great for this design as the client wanted to feel like they are out in the open, while maintaining some protection from the sun and rain. You can find out more about the Alsynite products here, http://www.alsynite.com/. Thanks again the Team at Tempus :)