What is Slab or RCC Floor Slab? Slab: The flat plates that are made of R.C.C. or C.C. are called slabs or floor slab. Overall R.C.C. Floor-slab can be divided into the following categories. Such as  One Way Slab Two Way Slab  Flat Slab Ribbed Slab R.B. Slab  1. One Way Slab The edges of the