A grid slab or waffle slab is a reinforced concrete floor system with a waffle-like pattern of ribs. The ribs form a grid that runs in two directions, giving the underside a waffle-like appearance. This allows the slab thickness to be minimized while maintaining strength. Waffle slabs provide good load distribution, vibration control, and structural stability, making them suitable for use in airports, hospitals, and other large structures.

1. GRID SLAB / WAFFLE SLAB

2. METROPOL PARASOL, italy
It is the world’s largest wooden
Structure which is made up of
Waffle system.
CHATRAPATI SHIVAJI
INTERNATIONAL AIRPORT MUMBAI.

3. A grid slab is a type of building component that has two
directional reinforcement the INTERMEDIATE CROSS BEAMS
are cast on a regular square grid that gives the underside of the
floor the appearance of a waffle, hence the name.
If a column grid is increased from 6 to 12 square or near square, it
becomes economical to use a floor with intermediate cross beams
supporting thin floor slabs.
Greater the depth of the ribs more resistance to the bending.

4. structures that disperse applied loads in multi-
directional pattern, with the loads generally
following the shortest stiffest routes to the supports.
As an applied load is transmitted to the supports
through bending of one beam ribs, the load is
distributed over the entire slab by vertical shear
transmitted from the deflected rib to adjacent ribs.
WORKING
allows a considerable reduction in dead load as
compared to conventional flat slab construction
since the slab thickness can be minimized due to
the short span between the joists
TWO DIRECTIONAL
REINFORCEMENT

5. 1 SLAB DEPTH
2 DOME FORMS/ MOULD
(Square metal or fiberglass)
3 RIBS
4 MODULE
COMPONENTS

7. A waffle slab is a two-way concrete slab
reinforced by ribs in two directions.
The waffle grid form of the floor may be
cast around plastic or metal formers laid
on timber centering, so that the smooth
finish of the soffit may be left exposed.
The assembly of the coffer blocks is done
on the ground before being lifted into
position between the supporting ribs.
less labor and quick and easy installation.

8. Waffle slab can be efficiently
cantilevered in two directions
o Waffle slabs are used for larger span
slabs or floors
o The load carrying capacity of waffle
slab is greater
o It has good vibration control capacity
o They provide good structural stability
along with aesthetic appearance. it is
constructed for airports, hospitals,
temples, churches
o Waffle slabs are lightweight and
requires less amount of concrete
it is economical.
o Construction of waffle slab is easy
and quick with good supervision.

9. Spanish architects Alarcon Asociados
accommodate
electrical cables,
plumbing and
ventilation ducts
within the floor
structure rather
than hung below.
SERVICES
HOLEDECK

10. 200
100