Floor and ceiling slabs are composed of precast and semi resistant joists T-11, with need for cross beam support for its execution.

Floor and ceiling slabs are composed of T-18, T-20 and T-23. Depending on their lengths they work as self-supporting and therefore, do not need the help of cross beam supports.

On the one hand all these kinds of floor and ceiling slabs are completed with pieces of correspondent beam filling, on the other hand armatures or welded wire meshes, the mixed concrete and compression layer are spilt at site.