The prestressed ceiling slabs, or ribbed slabs, are generally preferred for superstructures such as residential and industrial constructions, hotels, multi-storey car parks, supermarkets, etc. With span widths between 8 - 13 m. The pre-spanned ceilings are used where the loosely reinforced ceilings are close to their limits, with regards to load and span width. The width, depending on the production procedure, is up to 3 m, thickness of the concrete board is 80 - 120 mm.

The longitudinal reinforcement of the pre-spanned ceilings consists of bracing wire strings, for transverse reinforcement,steel bars are laid over the pre-stressing reinforcement. Depending on the ceiling type and the span width, the level of support work can be reduced to partial - or even deleted. The major advantage of this system is the large available span widths of the prespanned ceiling and the minimal support requirements.

By replacing traditional shuttering methods the underside of the finished slab has a high finished surface quality = it can be wallpapered or painted. Plastering work is not required, the joints between the individual slabs must be filled to create a flush finished surface.