A waffle slab foundation, also called a ribbed slab foundation, is an above-ground type of foundation used to provide load-bearing capacity in expansive, rocky or hydro collapsible soils. The foundation is created by placing a series of single-use plastic forms set directly on grade to create a grid of ribs, and then monolithically pouring a post tensioned, rebar or Fiber reinforced concrete slab, usually 4 to 8 inches thick between the ribs.
A waffle slab foundation, also called a ribbed slab foundation, is an above-ground type of foundation used to provide load-bearing capacity in expansive, rocky or hydro collapsible soils. The foundation is created by placing a series of single-use plastic forms set directly on grade to create a grid of ribs, and then monolithically pouring a post tensioned, rebar or Fiber reinforced concrete slab, usually 4 to 8 inches thick between the ribs.
Source: Wikipedia "Waffle slab foundation" · CC BY-SA 4.0
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