Roof panels

 

Outside

Inside

 

That's the first layer finished. That forms the base for the steel reinforced concrete layer which will be tied into the walls forming a homogeneous slab. Upon this slab the roof tiles are laid. So there will be some weight by the time they finish, base, reinforced concrete, insulation and finally roof tiles o teja arab. 

And by the way you can see the sea from up there, tenuous but it is definitely Mare nostrum.