What Is Rising Damp?
Rising damp occurs when ground moisture travels upward through porous masonry by capillary action. It brings dissolved salts that damage plaster, paint, and structural timbers. Rising damp is one of the most common waterproofing problems in Melbourne, particularly in suburbs with older housing stock like Richmond, Fitzroy, Brunswick, and Hawthorn.
Why Melbourne Is Prone to Rising Damp
Melbourne's clay soils retain moisture close to foundations. Many homes built before the 1970s lack effective damp-proof courses. The combination of moisture-retentive soil and porous brick or stone construction creates ideal conditions for rising damp.
How to Identify Rising Damp
Look for damp patches on lower walls (up to 1 metre high), white salt deposits on brickwork, peeling paint near the floor, musty smells in ground-level rooms, and rotting skirting boards. A professional moisture assessment with electronic meters confirms the diagnosis.
Treatment Options
Chemical DPC injection is the most common treatment. Costs range from $1,500 for a single wall to $8,000+ for full perimeter treatment with replastering. Complete remediation including drainage can cost $8,000–$20,000.