The Constructor

What is a Plinth Beam? Its purpose, Applications and Construction: Explained With Video

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What is a Plinth Beam and its Purpose in a Building?

Plinth beam is a reinforced concrete beam constructed between the wall and its foundation. Plinth beam is provided to prevent the extension or propagation of cracks from the foundation into the wall above when the foundation suffers from settlement. Plinth beams distributes the load of the wall over the foundation evenly.

Fig.1: Plinth Beam

Applications of Plinth Beam

Fig.2: Applications of Plinth Beam

Concrete Strength Suitable for Plinth Beam Construction

Strength of plinth beam concrete shall not be smaller than 20MPa. If concrete is mixed manually, then an extra of 20% cement need to be added to the mixture. Figure 3 show plinth beam concrete preparation placement.

Fig.3: Concrete mix preparation and placement for plinth beam construction

Minimum Dimension of a Plinth Beam

A minimum depth of plinth beam is 20cm whereas its width should match the width of final course of the foundation.

Formwork for Plinth Beam

Formwork used for plinth beam construction should be properly installed and adequately secured prior to concrete placement as shown in Figure-4. The concrete needs to be compacted sufficiently to prevent steel bars from aggressive elements.

Fig.4: Plinth beam shuttering is completed

Steel Bars Used for Plinth Beam

It is recommended to provide two bars with minimum diameter of 12mm at the bottom of the beam. Similarly, two bars with minimum diameter of 10mm shall be provided at the top of the plinth beam. Reinforcement bars should be protected by 25mm concrete cover. As far as stirrups are concerned, stirrup diameter should be at least 6mm and a spacing of 15cm should be sufficient.

Fig.5: Reinforcement installation for plinth beams are completed

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