![RIBBED SLABS to EN 1992-1: 2004 1 RIBBED SLABS to EN 1992 1. 2004](https://excel.civilmdc.com/wp-content/uploads/2021/11/RIBBED-SLABS-to-EN-1992-1.-2004.png)
A Ribbed Slab gives considerable extra strength in one direction while a waffle slab gives added strength in both directions. And this is possible only in monolithically cast concrete which is the two-way grid of beams. In comparison to the solid slab, the span limits of ribbed slabs are considerably longer.