This is the most commonly used method of treating rising damp. A water-repellent, or silicone based material is pumped into the section of wall affected by the failure of the original damp proof course.
A damp course prevents moisture from rising into the walls, however because the ground salts have already risen a wall will not dry out completely unless the damaged plaster has been removed and replaced by our specially formulated and manufactured salt retardant render .Plaster is usually removed to a height of 1.2m, this could be higher depending on the salts within and other factors. Then a damp proof course is injected along the motor joint at the base of the wall until the entire depth of the wall has been impregnated.
- Injecting chemical damp course
- tanking wall internally
- Re-plastering of salt affected plaster
- Additional external works may also be required
Physical Damp course
The Building Research Establishment, in its Digest 245, confirms that a physical damp-proof course is the only completely sure method to cure rising damp but is very expensive, involving sawing out sections of a mortar bed and then inserting physical membrane.
Diamond chainsaws and grinders are used to cut a section through the wall, of up to 1m in length. The dpc plates are then placed in the slot, bedded on mortar, with spacers inserted along the section to support the wall and compress the mortar. This wall is then repainted to create a finished job that is both neat and tidy, and – more importantly – effective. After the first section of wall is finished then the next metre of wall can be treated. It is a labour intensive and disruptive process but the work can be guaranteed for 50 years.
The lifespan of a physical damp course is far longer than any chemical damp-proofing and it creates a total barrier against rising damp treatment Dublin.