Waffle slab

[2]A waffle slab is flat on top, while joists create a grid like surface on the bottom.

[3] This type of structure, because of its rigidity, is recommended for buildings that require minimal vibration, like laboratories and manufacturing facilities.

[4] First the supports are built, then the pods are arranged in place, and finally the concrete is poured.

This process may occur in three different approaches, however the basic method is the same in each: Different guides have been made for architects and engineers to determine various parameters of waffle slabs, primarily the overall thickness and rib dimensions.

The following are rules of thumb, which are explained further in the accompanying diagrams: The waffle slab floor system has several advantages:

The underside of a waffle slab, showing the grid like structure
Section of a waffle slab including beam, ribs, and column head
Diagram shows slab and rib width with rules of thumb formula
Diagram showing waffle slab rib and Beam Heights rule of thumb formulas.
Diagram shows the width of the column head with rule of thumb formula