Moisture in Buildings
Rising Damp in Walls: Causes, Risks, and Long-Term Solutions
Moisture problems are common in Belgian buildings, especially older properties without a damp-proof membrane. Rising damp, salt contamination, condensation, and water infiltration can cause significant damage, including damp walls, crumbling plaster, unpleasant odours, mould growth, and a noticeable reduction in comfort and indoor air quality.
Exxpert specializes in the diagnosis, assessment, and treatment of rising damp. Our approach combines technical expertise, building physics, and practical experience to accurately identify the cause and recommend effective, long-lasting solutions.
What Is Rising Damp?
Rising damp occurs when moisture from the ground travels upward through porous materials such as brickwork, mortar, and natural stone. This typically affects buildings:
- without a damp-proof membrane at the base of the walls
- where the membrane is missing, damaged, or incorrectly installed
- where ground levels have been raised
- exposed to long-term soil moisture
Groundwater contains soluble salts that crystallize within walls, causing ongoing damage even when surfaces appear dry.
Common Signs of Rising Damp
- peeling paint or plaster
- salt efflorescence (white deposits)
- loose skirting boards
- deteriorating mortar joints
- mould growth
- cold and damp walls
- musty odours
These symptoms can resemble other moisture-related issues such as condensation or water infiltration, making professional diagnosis essential.
Why Accurate Diagnosis Matters
Many treatments fail because rising damp is diagnosed too quickly. In reality, multiple causes often occur together, including:
- construction moisture
- thermal bridging
- condensation
- leaks and water infiltration
- hygroscopic salts
Exxpert performs a complete moisture assessment, including:
- moisture measurements (gravimetric, carbide, resistance, and capacitance testing)
- salt analysis
- interior and exterior inspections
- ventilation and hygrothermal evaluation
- interpretation by a building pathology specialist
This helps prevent misdiagnosis and unnecessary repair work.
Rising Damp Treatments According to Buildwise Guidelines
