Treating Rising Damp in Brisbane
Rising damp is a persistent problem in many older Brisbane properties, particularly those on clay soils in suburbs like Paddington, Ipswich, and parts of Logan. Effective treatment requires addressing the moisture source and repairing the damage caused. This guide covers the main treatment methods and typical costs.
Chemical Damp-Proof Course (DPC) Injection
The most common treatment for rising damp in Brisbane is chemical DPC injection. This involves drilling holes into the mortar course at the base of affected walls and injecting a silicone-based solution that creates a horizontal barrier against moisture migration. The process is minimally invasive and can be carried out without major disruption. Costs typically range from $100 to $200 per linear metre.
Sub-Floor Ventilation Improvement
For raised Brisbane homes (particularly Queenslanders), improving sub-floor ventilation can significantly reduce moisture levels. This may involve adding extra vents, installing mechanical ventilation fans, or clearing obstructions that restrict airflow under the house. Sub-floor ventilation systems typically cost $1,500 to $4,000 depending on the house size.
Remedial Plastering and Rendering
After treating the moisture source, contaminated plaster must be removed and replaced. Salt-contaminated plaster continues to attract moisture even after the DPC is installed. Specialised salt-resistant renders are applied to prevent salt re-crystallisation and provide a clean, dry finish. Replastering costs depend on the extent of damage but typically add $50 to $100 per square metre.
External Drainage Improvement
In some cases, improving external drainage is necessary to complement DPC treatment. This may include installing agricultural drainage pipes, regrading soil away from foundations, or lowering ground levels that have been built up against walls. Drainage work costs vary significantly based on scope but should be considered as part of a comprehensive treatment plan.
Getting Expert Assessment
Accurate diagnosis is essential before committing to treatment. We connect you with rising damp specialists in Brisbane who conduct thorough assessments, including moisture readings and salt analysis, before recommending a treatment plan. Request your free assessment through our platform.