What is the principle of the slab?
The east slab cast with its welded mesh of light reinforcement on a plastic film covering a bed of sand. Or the east slab poured on clean concrete: a layer of thin concrete placed directly on the level ground and who at its catch before the casting of the slab which must bear loads.
The floor slab is both floor and ceiling, it is also at the last level the possible support of the waterproofing of the building. The plan drawing of the slabs of the building can lead to standard formwork for the manufacture of floors of rooms with repetitive shapes (garage-boxes, offices, hotels delivered to companies).
The slab can be made with self-leveling concrete (BAN) which does not require a vibrator. The masonry finish is done with a ruler drawn at the right time at the end of the setting.
The slab can be double, (a ceiling slab, a void of a few centimeters, a floor slab), to reduce sound and heat conduction and separate neighborhoods more strongly.
Or the slab is cast on clean concrete: a layer of thin concrete placed directly on the level ground and which has its grip before the casting of the slab which must support loads.