How the Chemicals work.
These hydrophobic chemicals form a non-wetting surface within the capillaries. This makes the capillary wall slippy and controls the upward creep of water, thereby only controlling rising damp. This method is a crucial part of a chemical damp proof course system.
Remove hygroscopic salts carried by groundwater rising up the masonry wall from the original plaster during the remediation process for best results. Removing these salts is crucial, as they can cause significant damage over time. Once you complete this step, you can begin restoring the distinctive striped plasterwork using a specialised render designed to prevent salt migration to the surface. This carefully planned approach is vital for managing the damp-proof course effectively. It ensures a long-lasting solution to the moisture issues at hand.
Some History
As a Repair Chemical, damp-proof courses were first introduced in the 1960s and were primarily applied using an injection pump. This method, initially recognised for its effectiveness, involved installing water-repellent substances such as silicones or aluminium stearate into drilled holes in the brick, stone, or mortar of a wall. Following a specific pattern determined by the installer, this approach aimed to enhance moisture resistance.
An innovative repair method, originally celebrated for its remarkable effectiveness, involves carefully inserting water-repellent substances like silicones or aluminium stearate into drilled holes in brick, stone, or mortar. By following the installer’s specific pattern, this technique significantly boosts water resistance. Over the years, though, we’ve seen a shift away from high-pressure injection methods for chemical damp proofing, as they are labour- and skill-intensive. To cream injection DPC, which is a low-skill requirement.
The cream DPC is conveniently applied from a cartridge into drilled holes in the mortar bed joint. This streamlined approach not only simplifies the process but also makes damp proofing accessible for everyone.
Note: effectively installing a chemical damp-proof course will manage rising damp for many years.
A cavity drain lath membrane, often fitted to the walls, acts as a total salt barrier, then replastered over. This method complements the effectiveness of a chemical damp proof course in combating moisture problems.