The main function of a DPC (damp-proof course) is to prevent rising damp by acting as a barrier against moisture rising through capillary action in building materials.
Here's a more detailed explanation:
Rising damp occurs when groundwater is drawn up through porous building materials, such as brick or concrete, by capillary action. This can lead to significant problems, including:
- Structural damage: Dampness can weaken building materials and cause them to deteriorate.
- Health issues: Mold and mildew thrive in damp environments, which can trigger allergies and respiratory problems.
- Aesthetic problems: Dampness can cause unsightly staining, peeling paint, and bubbling plaster.
A DPC is a horizontal layer of waterproof material inserted into the walls of a building, typically near ground level. Its purpose is to block the upward movement of water, preventing it from rising higher in the wall.
The materials used for DPCs vary, but common examples include:
- Bituminous felt: A flexible and durable material made from asphalt-saturated felt.
- Plastic: Polyethylene or PVC sheets are commonly used.
- Slate: A traditional material that is naturally waterproof.
- Engineering bricks: Bricks with low porosity.
In summary, a DPC is a critical component in preventing rising damp and protecting buildings from the damaging effects of moisture. It acts as a horizontal barrier within a wall, ensuring that water cannot rise through capillary action.
