What is Rising Damp?
Rising damp is the phenomenon by which groundwater rises through the pores of building materials, impregnating walls and partitions from their base.
How to Recognize It
Typical signs include:
- Damp patches on the lower part of walls (up to 1-1.5m height)
- Peeling paint and plaster
- Saline efflorescence (crystallized white spots)
- Persistent smell of damp
- Deterioration of skirting boards and low joinery
Main Causes
- Absence of damp-proof course in the foundation (common in old buildings)
- High water table in the ground
- Breaks in the sanitation network that dampen the perimeter ground
- Very porous materials (old ceramic bricks, lime mortars)
Expert Diagnosis
An expert must:
- Take measurements with a hygrometer to quantify the level of humidity
- Rule out other causes (leaks, condensation)
- Identify the source of the water (water table, leaks, rain)
- Propose the most appropriate technical solution
Effective Solutions
Waterproofing Resin Injection
Holes are drilled at the base of the wall and a resin is injected creating a chemical waterproof barrier.
Electro-osmosis
An electrical system is installed that reverses the capillary flow, pushing the water back to the ground.
Perimeter Drainage
Excavation is done around the building and a drainage system is installed to reduce the water table.
Conclusion
Rising damp requires a definitive solution, not patches. An expert report is essential to choose the correct treatment and avoid wasting money on ineffective solutions.