A Damp Proof Course (DPC) is made by constructing a barrier, typically on top of brickwork, using reinforced cement concrete. This barrier prevents moisture from rising through the walls of a building.
Here's a breakdown of the DPC construction process:
-
Preparation: The process starts after the brickwork reaches the intended DPC level.
-
Shuttering: Shutters (formwork) are placed above the brickwork to contain the wet concrete. These shutters define the shape and thickness of the DPC layer.
-
Reinforcement: Reinforcement bars are strategically placed inside the shutters. This reinforcement strengthens the DPC layer, preventing cracks and enhancing its durability.
-
Concrete Mixing: Cement concrete is mixed in a specific ratio. The reference indicates a ratio of 1:2:4 (Cement:Sand:Aggregate), which corresponds to M15 grade concrete. This ratio ensures the concrete has adequate strength and workability.
-
Pouring and Compaction: The mixed concrete is poured into the shuttered area, covering the reinforcement bars. It's crucial to properly compact the concrete to eliminate air pockets and ensure a dense, impermeable layer. Vibration techniques are often used for this compaction.
-
Curing: After pouring, the concrete needs to be cured. This involves keeping the concrete moist for several days to allow it to hydrate properly and gain strength. Curing is essential for the DPC's long-term effectiveness.
In summary, DPC creation involves creating a reinforced concrete layer above brickwork, using shuttering and a specific concrete mix (like M15), followed by proper compaction and curing. This creates a horizontal barrier preventing rising damp.
