The plinth beam is a very important structure of a building. It is a load-bearing structure of a building like column, beam, footing, etc. Just as the **size of the column for 1, 2, 3, 4 and 5-storey buildings** should be of standard size, Similarly the size of plinth beam for 1, 2, 3, and 4-storey buildings be standard size.

**What is plinth beam**

A plinth beam is a reinforced concrete structure of a building. The plinth beam is a horizontal beam, which is constructed above the ground level and it is constructed between the wall and foundation. The plinth beam is very necessary for the wall. Because It equally distributes the building load on the column. Plinth beam preventing the wall from cracks.

The construction of plinth beams is mandatory in earthquake-prone areas. **M20 grade of concrete** should use in the construction of the plinth beam. The plinth beam depth and width should not be less than 9 inches and in the plinth beam, the steel bar should not be less than 12mm.

## What is the plinth beam size for 1, 2, 3, and 4 storey building/ house

**Minimum size of plinth beam**

According to the thumb rule minimum dimension of the plinth, beam should be at least 9 × 9 inches or 230mm × 230mm (Width × depth). M20 grade of concrete and minimum 4 steel bars of 12mm is used with 8mm stirrup. And ideal stirrups-to-stirrups distance is 6 inches in the plinth beam.

### Plinth beam size for G+0 or 1 storey bulding/ house

Plinth beam size for 1 storey house should be at least 9 × 9 inches (Width × depth). M20 grade of concrete and 4 steel bar of 12mm used with 8mm stirrups. Stirrups to stirrups distance should be 6 inches according to the thumb rule for the plinth beam of G+0 storey house.

### Plinth beam size for G+1 or 2 storey bulding/ house

The plinth beam size for 2 storey house should be at least 9 × 12 inches (Width × depth). M20 grade concrete and 5 steel bars of 12mm used with 8mm stirrups. 2 steel bars are used on top of the plinth beam, and 3 steel bars are used at the base of the plinth beam. Stirrups to stirrups distance should be 6 inches according to the thumb rule for the plinth beam of G+1 storey house.

### Plinth beam size for G+2 or 3 storey bulding/ house

Plinth beam size for 3 storey house should be at least 9 × 12 inches (Width × depth). M20 grade concrete and 2 steel bar of 12mm and 3 steel bars of 16mm are used with 8mm stirrups.

2 steel bars of 12mm used at the top of the plinth beam and 3 steel bars of 16mm used at the bottom of the plinth beam. Stirrups to stirrups distance should be 6 inches according to the thumb rule for the plinth beam of a G+2 storey house.

### Plinth beam size for G+3 or 4 storey bulding/ house

The plinth beam size for 4 storey house should be at least 9 × 15 inches (Width × depth). M20 grade concrete and 5 steel bars of 16mm and 2 steel bars of 12mm used with stirrups.

2 steel bars of 16mm used the top of the plinth beam and 3 steel bars of 16mm used at the bottom of the plinth beam. And 2 steel bars of 12 mm used in the middle of the plinth beam. Stirrups to stirrups distance should be 6 inches according to the thumb rule for the plinth beam of G+3 storey house.

#### Conclusion

We discussed in this article what is the plinth beam size for 1, 2, 3, and 4-storey buildings/houses. The **standard size of plinth beams for 1, 2, 3, and 4-storey houses/buildings** is very important. Because it is a load-bearing structure and any load-bearing structure should be of the right standard size.