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The Invisible Leak: Solving a Chronic Condensation Mould Problem in Macquarie Park
Updated: 13 hours ago
By Michael Nguyen | Indoor Environmental Professional (IEP) | IICRC WRT, AMRT, ASD (69486970) | Mould Testing Technician (NAT10913005) | Licensed Builder NSW 392154C (Supervisor, KBL+RENO)
With the high humidity Sydney has experienced over the past few months, our team has seen a huge increase in calls about a specific issue: significant mould growth in modern apartments, even when there are no water leaks. This recent project in a Macquarie Park strata building is a classic case study of this common environmental problem and the proper way to solve it for good.
Step 1: The Inspection - Identifying the Cause Without a Leak
The client called us after noticing extreme mould growth appearing on the ceiling in their dining and kitchen area, along with visible condensation marks running down the walls. Our certified inspector conducted a thorough mould assessment and, using moisture meters and a thermal camera, confirmed that there was no water ingress from a pipe or the roof. The problem wasn't a leak; it was the air itself.
Step 2: The Diagnosis - A Home That Can't Breathe
Our investigation concluded that the apartment suffered from two common problems in modern buildings: a lack of effective cross-ventilation and bathroom extractor fans that were too small and inefficient for the size of the rooms.
This meant that moisture from everyday activities—showering, cooking, drying clothes, even breathing—was being trapped inside the apartment. This raised the indoor relative humidity to levels where the moisture would condense on cooler surfaces like ceilings and walls, creating the perfect damp conditions for mould to thrive.
Step 3: Our Two-Part Solution - Remediation First, Then Management
Cleaning the mould is only half the battle; providing a long-term solution is our priority.
Professional Remediation: Our IICRC certified team first carried out a meticulous mould remediation of all affected surfaces. For areas with deep growth, the plaster was cut out and replaced. For superficial growth, we followed the IICRC S520 "sandwich" method: a thorough HEPA vacuum, followed by a damp wipe with an antimicrobial solution, and a final HEPA vacuum to ensure all spores were removed.
Long-Term Prevention Plan: To prevent the problem from returning, we provided the client with a clear, actionable plan. We strongly recommended they begin using a quality dehumidifier to actively pull excess moisture from the air, especially during wet seasons or when drying clothes indoors. We also provided a report confirming that their bathroom fans were undersized, which they can now take to their strata and an electrician to have suitable units installed.
Conclusion: More Than a Clean-Up, A Permanent Solution
This Macquarie Park case study proves that the source of a mould problem isn't always a dramatic leak. By using a scientific, diagnostic approach, we were able to identify the chronic humidity issue and provide a solution that not only cleaned the mould but also empowered the homeowner with the knowledge and a clear plan to keep it from coming back.
If you live in an apartment and are struggling with persistent mould, condensation, or a musty smell, contact our team for an expert assessment of your indoor environment for mould.
Photos from this mould removal job in Macquarie Park
Landlord, tenant or property manager? See our rental property and NCAT mould inspections for how we work out whether mould is a building problem or condensation.
About the Author
Michael Nguyen is the director of AAA Mould Removal and leads our water damage and mould remediation work across Sydney. His qualifications include:
Indoor Environmental Professional (IEP) – Testing Water-Damaged Buildings, Australian College of Environmental Studies (RTO 21740), 2026. Includes nationally recognised units NAT11429003 Conduct a comprehensive mould and moisture assessment and NAT11429007 Conduct post remediation verification mould testing (11429NAT Advanced Diploma of Building Biology)
IICRC Water Damage Restoration Technician (WRT)
IICRC Applied Microbial Remediation Technician (AMRT)
IICRC Applied Structural Drying (ASD), IICRC no. 69486970
Mould Testing Technician (NAT10913005)
Licensed Builder NSW 392154C (Supervisor, Kitchen, Bathroom & Laundry and Renovation)
Carpentry Licence
AAA Mould Removal is an IICRC Certified Firm. Michael is also completing a double degree in Medical Science and Environmental Science at Macquarie University.
Worried About Mould or Water Damage?
Call AAA Mould Removal on 1300 739 783 or contact us online. We will find the moisture, remove the mould properly and dry your home to IICRC standards.
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