What is Rising damp?
A simple definition of Rising damp is ground water entering the inner structure of a building by capillary action. Water that enters a building through any other way is not rising damp.
In walls, Rising damp can be successfully treated by installing a chemical damp proof course, in accordance with British Standard 6576 and replacing the salt contaminated plaster. Failure to replace the plaster will result in future spoiling of the plaster and any decorative finish.
In damp solid floors, rising damp can be eliminated by applying a liquid damp proof membrane followed by a protective layer of screed.
What is chemical damp proofing?
Damp proofing at its simplest is preventing walls from acting like a sponge and drawing water up from the ground (Rising Damp). Modern buildings are constructed with a tough Damp Proof Course sandwiched between the bricks right around the house just above the foundations.
This damp course acts as a physical barrier prevents damp from rising up the walls. Unfortunately however many older buildings never had a damp course or the materials originally used have broken down, allowing dampness to push through.
This is where a Chemical DPC (Damp Proof Course) comes in. In simple terms you drill bore holes in the wall and pump in a chemical fluid which reacts with the moisture to form a permanent water barrier.