Which of the following is NOT a primary function of the plinth?

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  1. Distributing load to the foundation
  2. Raising the floor level to prevent water ingress
  3. Preventing insects from entering the building
  4. Providing support to upper floors

Answer (Detailed Solution Below)

Option 4 : Providing support to upper floors
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Explanation:
Functions of Plinth

  • The plinth acts as an intermediate structural element that transfers the load from the superstructure (walls and floors) to the foundation evenly.

  • It helps in avoiding differential settlement by spreading the loads uniformly.

  • One of the main purposes of the plinth is to elevate the floor level above the surrounding ground.

  • This protects the building from rainwater runoff, flooding, or capillary rise of water from the soil.

  • By raising the floor level and using damp-proof materials, the plinth helps reduce entry points for termites, ants, and other ground-dwelling insects.

  • Combined with proper treatment, the plinth can act as a barrier against pest infestation from the soil.

Additional Information Plinth Level vs. Ground Level

  • The plinth level is usually 300 mm to 600 mm above the ground level, depending on site drainage, flood risk, and architectural requirements.

  • This elevation helps prevent surface water, debris, and mud from entering the building during rains or floods.

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