Damp proofing is defined as stopping damp. There are essentially two methods:
- Block damp; typically by injecting chemicals and replacing plaster with impermeable slurry.
- Stop damp: trace the root cause of moisture, check that it is the root cause and monitor over time.
Only the 2nd method damp proofs a property long term, and stops the risk of rot, such as dry rot seeing in this image.
See damp proofing case studies.