The main purpose of a Damp Proof Course (DPC) is to prevent moisture from rising through walls via capillary action.
Here's a more detailed explanation:
A DPC acts as a horizontal barrier within a wall's structure to block the upward movement of ground moisture. This rising damp can cause significant damage to buildings, including:
- Structural weakening: Moisture can deteriorate building materials like brick, mortar, and timber.
- Aesthetic damage: Dampness can lead to peeling paint, staining, and the growth of mold and mildew.
- Health hazards: Mold and mildew growth associated with dampness can trigger allergies and respiratory problems.
- Reduced insulation: Wet walls offer less effective insulation, increasing heating costs.
DPC is typically installed near the base of the wall, just above ground level. Common materials used for DPC include:
- Rich cement concrete (e.g., ratio of 1:1.5:3, approximately 2.5 cm thick)
- Cement mortar (e.g., ratio of 1:2) mixed with a waterproofing material (approximately 2 cm thick)
- Waterproof membranes (various materials like bitumen, plastic, or slate)
By effectively preventing rising damp, a DPC protects the structural integrity, appearance, and health of a building's inhabitants.
