RIBBED SLAB 101: Everything You Need to Know If you’re building in 2026, you NEED to understand this technology. Let me break it down: WHAT IS A RIBBED SLAB? A ribbed slab (also called waffle slab or hollow block slab) is a reinforced concrete slab with systematic voids created underneath, forming a pattern of ribs or beams. Unlike solid slabs that use concrete throughout, ribbed slabs strategically place concrete only where it’s structurally needed. HOW IT WORKS: Traditional Solid Slab: • Concr