We could say that the slab is the end product of building construction. In the whole building area, the slab is the only structural element we often use and care about.

**Contents of the Article**show

The entire structure elements such as beam, column, and foundation are the supporting parts to transfer the load that a slab carries. There are two types of slab according to the area and load handling.

- One Way Slab
- Two Way Slab

**What is One Way Slab?**

As per IS 456:2000, One way slab is nothing but a slab that has the ratio of longer span to shorter span>= 2.

That means anyone of the slabâ€™s sides is two times greater than or equal to the other side.

Assume a slab (5m x 2m), The ratio of longer to shorter side is = 5/2 = 2.5. Ly/Lx >= 2, Since this is a **one way slab**.

**Load Handling **â€“ In one way slab, the slab transfer the load in only one direction to the adjacent beams as shown pic

**One Way Slab Reinforcement Details**

To support the bending moment, the main bars are provided in a shorter span.

**What is Two Way Slab?**

As per IS 456:2000, Two way slab is nothing but a slab which has the ratio of longer span to shorter span <2.

Assume a slab, (2.5m x 2m), The ratio of longer to shorter side is = 2.5/2 = 1.25. Since this is a **two way slab**.

**Load Handling **â€“ In two way slab, the slab transfers the load equally to the adjacent beams in all direction as shown pic

**Two Way Slab Reinforcement Details**

**Difference between One Way Slab and Two way slab**

One Way Slab |
Two Way Slab |

Ly/Lx >=2 | Ly/Lx <2 |

Loads carried along one direction | Loads carried in both directions |

Slab bends only in one direction along its shorter span | Slab bends in both directions |

To support the bending moment, main bars are provided in a shorter span | To support the bending moment, the main bars are provided in both directions |

Supported by beams on two sides | Supported by beams on all sides |

Chajjas are practical examples of one way slab | Slabs constructed at small and high rise buildings. |

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