Introduction
For decades, different methods have been used to deal with rising damp in walls. Many of these treatments involve construction work and focus on creating a barrier between the ground and the building materials. While some can be effective under certain conditions, each has its own strengths and limitations.
Chemical injections
How it works
- Holes are drilled along the base of the wall.
- A water-repellent chemical or resin is injected.
- The substance aims to form a damp-proof barrier inside the masonry.
Pros
- Widely used and well-known.
- Can be applied to various wall materials.
- Acts directly at the base of the wall.
Cons
- Requires skilled labour for correct application.
- Effectiveness varies depending on the wall’s porosity and salt content.
- Invasive: drilling damages the wall surface.
Physical damp-proof course (wall cutting)
How it works
- The wall is cut horizontally near the base.
- A physical damp-proof membrane (plastic or slate) is inserted.
Pros
- Provides a permanent physical barrier when installed properly.
- No dependence on chemical products.
Cons
- Very invasive: cutting the wall can compromise structural stability.
- Expensive and labour-intensive.
- Not suitable for all types of buildings, especially historic ones.
Special plasters and renders
How it works
- Walls are coated with breathable or salt-resistant plaster.
- Allows salts and moisture to evaporate without damaging the visible surface.
Pros
- Improves wall appearance.
- Can control visible stains for a period of time.
Cons
- Does not stop rising damp itself.
- Requires reapplication after some years.
- More cosmetic than structural.
Drainage and ventilation improvements
How it works
- Drains are installed around the building to lower groundwater contact.
- Increased ventilation helps reduce surface moisture.
Pros
- Reduces humidity levels in basements or poorly ventilated rooms.
- Can complement other treatments.
Cons
- Does not stop capillary action inside walls.
- Requires construction work and ongoing maintenance.
Alternative modern technologies
Beyond traditional treatments, there are non-invasive devices designed specifically for rising damp:
- Electronic systems (ATE) → work with electronic impulses influencing water movement.
- Geomagnetic systems (ATG) → use natural fields, require no electricity or maintenance.
These represent newer approaches compared to conventional methods.
Conclusion
Traditional treatments for rising damp include chemical injections, physical barriers, breathable plasters, and drainage. Each offers potential benefits but also presents significant limitations in terms of cost, invasiveness, or durability. Today, modern technologies such as ATE and ATG devices provide alternative approaches without the need for disruptive construction work.
