Our newly constructed house has no roof yet or slab because they are still building framework for it. My mother informed me that the lumber were not enough so they had one of the tree in our yard to be cut so they could finish adding the wood framework. Just the other day they already add steel bars to the framework and in few days they will probably pour cement on the pavement.
My mother told me that they need to hire more workers so pouring cement will just took one day because they will also rent a mixer rather than people doing the manual labor. I hope it could be done soon so our next project is house flooring and adding electricity line to the house.
Concrete roof is exactly what it sounds like, it is a solid slab of concrete capping the top of your house. Exact specifications vary, but most concrete roofs are several inches thick.