The Constructor

Waffle Slab or Ribbed Slab Construction Procedure and Advantages

Reading time: 1 minute

What is Waffle Slab or Ribbed Slab?

Waffle slab or ribbed slab is a structural component which is plain on its top and contains grid like system on its bottom surface. The top of ribbed slab is normally thin and the bottom grid lines are generally ribs which are laid perpendicular to each other with equal depth. Waffle slab has two directional reinforcement.

All the ribs are directed from column heads or beams. The depth of ribs maintained is as same as depth of column head or beam. Because of the ribs and double reinforcement, it is more stable and recommended for larger span slabs or foundations.

Characteristics of Waffle Slabs

Waffle Slab Construction Procedure

The construction of waffle slabs can be done by three ways as follows.

In-situ waffle slabs are constructed by pouring concrete in the site or field with proper arrangements. In case of precast waffle slab, slab panels are casted somewhere and they are joined together with proper reinforcement and concrete is filled.

The third case, prefabricated waffle slab is costliest than the other two methods. In this case, reinforcement is provided in the slab panels while casting with some tension. Hence, they do not need internal reinforcement in the site.

To construct a waffle slab in-situ conditions, formwork should be necessary to support the slab. But some special tools are required for the form work in case of waffle slab.

Formwork tools required in the construction of waffle slab are:

Horizontal support and vertical supports are arranged first and they are fixed in position by the connectors. At the edges wall connectors are used to provide connection between wall and slab. The horizontal beam supports are connected by small beam connectors which form square like shape in which pods are going to be placed.

The pods are generally made of plastic and they are available in different sizes and different shapes. Size selection of pod depend upon the requirement and span length. For longer span large number of pods are required. Same size should be used for one complete slab.

Similarly beam connectors and cube junctions are also available in different sizes based on the suitability of pod sizes.

Cube junctions are used to fix the corners of pods with the frame work. After fixing the formwork, reinforcement is placed in the two directions of the slab and then concrete is poured in the gaps which are called as ribs after hardening.

Thin concrete slab is provided on the top and after its hardening pods and frameworks are removed from the bottom. Thus, the waffle like shape appears at the bottom surface.

Benefits of Waffle Slab Construction

Drawbacks of Waffle Slab

Read More:

Concrete Calculator – Calculate Concrete for Slab, Beam, Column and Footings
Floating Slab Construction - Applications and Advantages
Types of Economical Floor Systems for Reinforced Concrete Buildings
Types of Construction Loads on Composite Slabs and Calculation
Causes of Excessive Deflections in Reinforced Concrete Slabs

Exit mobile version