Primarily seen in ageing properties, rising damp is caused when a damp proofing course has either failed or become ineffective over time. Unfortunately, rising damp can never be cured, but it can be controlled. Based in Beckenham, Kent, Apollo Damp Proofing Ltd replaces broken-down damp proofing courses and also uses DPC injections to keep the damp under control. If rising damp, or any form of damp, is left untreated, further damage could spread to interior floor timbers, resulting in major, expensive repair works. That is why you should always turn to our expert team when you encounter damp.
Damp moves through capillary action, traveling across the mortar joints of the brickwork and eventually causing damage to the interior finishing of the walls. Moisture being driven up from the ground will also transport along damaging hygroscopic salts. The salts are the white deposits you may have noticed on the outside of brickwork and on the surface of interior plasterwork.
To control rising damp, the existing, broken-down damp proof course needs to be replaced. This is achieved by injecting a chemical solution through holes drilled in the mortar joints. Due to the damaging hygroscopic salts that occur with rising damp, the internal plaster will need to be removed and replaced as part of the damp proofing process.
The chemical injected into the walls comes in many different forms, with the most common and effective being a chemical cream pressure injection. The process, and the materials involved, are fully approved and carry the British Standards trademark. These injections are a modern alternative to older treatments, which were often cement based or involved the use of crystalline products. These outdated methods proved problematic as the injections produced many salts, and the drying time posed another issue.
To install a new damp proof course, you must first begin by removing the skirting boards and wall plaster to reveal the brickwork. The removed plaster must be 1 metre high. 12mm holes are then drilled into the mortar joints 150mm above the ground level and at 12cm intervals. The chemical injection cream is then filled into the holes until they are full. Once injected, the cream will liquidise until dispersed through the mortar, forming a full, horizontal damp proof course. After this process is completed, we move on to the next stage – applying a specialist render and plaster system.