Yes, a Damp Proof Course (DPC) does work to prevent damp in walls.
How Does a DPC Work?
A DPC is a barrier, usually a waterproof material, placed in the wall of a building to prevent moisture rising from the ground into the structure. Without it, water can move upwards through the wall via capillary action leading to damp and structural damage.
Why DPCs Are Effective
According to the provided reference:
- Effectiveness: DPCs are "worthwhile due to how effective they are at preventing damp for walls."
However, issues can arise if the DPC is not installed correctly, which can include:
- Incorrect Installation: As noted in the reference, "often builders get this wrong" which can cause issues such as:
- Weak Spots: If the DPC isn't bedded properly, it will have weak spots. These weak spots will still allow damp to rise into the walls.
- Bridging: If materials like soil or render touch the DPC and the ground, moisture can 'bridge' the damp proof course, enabling damp to bypass the barrier.
Best Practices for DPC Installation
To ensure a DPC works effectively, it is essential to follow proper installation practices:
- Correct Bedding: The DPC must be fully bedded in mortar to avoid weak spots.
- Avoid Bridging: Ensure there are no pathways that allow moisture to bypass the DPC.
Conclusion
| Aspect | Detail |
|---|---|
| Function | To prevent rising damp by acting as a barrier. |
| Effectiveness | High when installed correctly. |
| Failure Points | Poor installation or bridging allows moisture bypass, nullifying its function. |
When correctly installed, DPCs are an effective method to stop rising damp in buildings.
