A layer of dry bricks put below the foundation concrete, in the case of soft soils, is called
🧱 Understanding Foundation Base Layers
When constructing a foundation, especially on soft or uneven ground, it's crucial to prepare a firm, level base before pouring the main structural concrete. This base layer serves two main purposes:
- It provides a clean, dry, and hard surface, preventing the foundation concrete from mixing with the soil, which would weaken it.
- It ensures that the load from the foundation is transferred more evenly to the ground beneath.
This preparatory layer is a common practice in foundation engineering.
🔬 Detailed Analysis of the Options
A. soling
This is the correct answer. "Soling" is the technical term for a layer of material—such as flat bricks, stones, or a thin layer of lean concrete (PCC)—laid at the bottom of a foundation trench. Brick flat soling, as described in the question, is a traditional and effective method to create a stable bed for the foundation concrete, particularly in soft soil conditions.
B. shoring
This is incorrect. Shoring is a form of temporary support used to prop up the sides of an excavation to prevent collapse, or to support an existing structure during alterations. It is a temporary structural system, not a permanent layer within the foundation.
C. D.P.C.
This is incorrect. D.P.C. stands for Damp Proof Course. It is a waterproof barrier installed at the plinth level (above ground level) to prevent moisture from rising up through the walls by capillary action. Its purpose is waterproofing, not providing a base for the foundation.
D. None of these
This is incorrect because "soling" is the precise term for the layer described.
📊 Summary: Foundation Terminology
| Term | Definition | Location & Purpose |
|---|---|---|
| Soling | A layer of bricks, stone, or lean concrete. | At the bottom of the foundation trench to create a level base. |
| Shoring | A temporary support system of props and planks. | On the sides of excavations or supporting structures to prevent collapse. |
| D.P.C. | A waterproof barrier. | At plinth level within the walls to stop rising damp. |
💡 Study Tips
- Soling = Sole of the Foundation: Think of the soling layer as the "sole" of a shoe for the foundation—it's the first solid layer that makes contact with the prepared ground.
- Shoring = Supporting: Associate the word "shoring" with "propping up" or providing temporary support.
- DPC = Damp Proof: The name itself tells you its purpose is to stop dampness. Remember it's in the wall, not under the entire foundation.
- Visualize the Layers: Picture the construction sequence: 1. Dig trench, 2. Lay soling, 3. Pour foundation concrete, 4. Build wall up to plinth, 5. Lay DPC.