The Last Type of Foundation is Slab. The Main Component of this Type of Foundation is a Huge Plate Located Under the Whole Extension. Perhaps this is the most expensive type of foundation. Use a Slab Foundation on Bad Saging Soils. For this, The Slab Foundation Receved Another Name — Floating. The Plate Is Made of Reinforced Concrete, While Its Still Reinforced with Reinforce. By the Way, Offten this Same Plate, Except for Its Fundamental Purpose, Performs Another Function — In Some Buildings Its A Floor of the First Floor.