SLAB definition: 1. a thick, flat piece of a solid substance, such as stone, wood, metal, food, etc., that is…. Learn more. Learn what a slab is and how it is used in construction to form the foundation and floors of buildings. Explore the different types of slabs, such as concrete, steel, and hollow-core, and their advantages and disadvantages. Learn about the function, types of loads, and load transfer mechanism of slabs, beams, columns, and footings in building structures. See diagrams and examples of different structural elements and their interactions. So, what is a slab , and why is it so vital in construction? This detailed guide will break down the definition of a slab , its types, uses, construction process, and advantages. Whether you’re a civil engineering student, a contractor, or a homeowner planning to build or renovate, understanding slabs is essential for successful construction outcomes.