Shell Roofing

[Bonboniere]

I want to build a concret shell roof (double curvature)on a concrete structure. I am thinking to use either simple timber or steel for the roof, and precast concrete panel on top. However, I am having problem of how to put the roof and the wall together, and is it possible to do so?? is the roof has to somehow touch the floor or it can be stand on top of the wall? Can u plz teach me how exactly the structure work, or send me some info on this topic, thank u so much!!!