Bridged DPC & Cavity wall footage

How debris within a cavity can lead to rising damp

The image above is extracted from the British Research Establishment DG245, diagnosing and treating rising damp. The detail shows a mechanism in how a physical damp proof course (DPC), can be breached. The base of a cavity should be clear from debris which can bridge a DPC, thus allowing moisture to rise upwards into the structure of the building. Fortunately this can be cured via a process of removing external bricks and clearing out debris. A tedious task but necessary in some cases.

Click here to watch a video of a cavity wall borescope inspection. What you will see is a prime example of a breached DPC.