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Common Water Issue in BC
Mould Growth on Walls — Hidden Moisture Source
Mould growing on interior walls indicates a persistent moisture problem. The source may be a hidden leak, condensation from poor insulation, or groundwater intrusion through the foundation. Mould poses health risks and must be addressed promptly.
Possible Causes
- •Hidden plumbing leak within the wall cavity
- •Condensation from thermal bridging at wall studs or headers
- •Groundwater seepage through foundation walls in basement
- •Leaking window frame or failed window seal allowing water entry
- •Poor bathroom ventilation causing chronic humidity and mould
Recommended Steps
- 1Do not paint over mould — the underlying moisture source must be found first
- 2Check for visible water stains, peeling paint, or bubbling drywall near mould
- 3Monitor if mould returns after cleaning — persistent mould means active moisture
- 4Call professional leak detection to inspect inside wall cavities without demolition
- 5Test for moisture content in affected wall materials to determine severity
Need Professional Help?
Don't let a small leak become a big problem. Contact LeakInspections.ca — a division of Anyleak.ca and Leak.ca — for expert diagnosis.