Methods of Damp-proofing There are several methods used for damp-proofing, including: Damp-Proof Course (DPC): A horizontal barrier, often made of impervious material, installed at the base of walls to prevent moisture from rising from the ground. Damp-Proof Membrane: A sheet of material used to create a waterproof barrier, often placed under floors or on walls. Damp-Proof Injection: A process where a water-repellent cream is injected into the walls to create a barrier against rising damp. Damp-