Mould is one of the most common and concerning issues homeowners and renters face in Australia. It’s not just unsightly — left unchecked, mould can damage your property’s structure and pose real health risks, particularly for people with respiratory conditions or compromised immune systems. Understanding why mould grows is the first step in keeping it at bay.
What Causes Mould to Grow?
Mould requires three things to thrive: moisture, warmth, and organic material to feed on. In homes, it commonly develops in bathrooms, kitchens, laundries, and around windows due to condensation and poor ventilation. Leaking pipes, inadequate roof waterproofing, and flooding are also major contributors. In Australia’s humid coastal regions, mould can be particularly persistent.
Identifying Different Types of Mould
Not all mould is created equal. The most common household moulds range from relatively harmless to potentially dangerous. Black mould (Stachybotrys chartarum) is the most notorious and should always be handled with professional care. Green and white moulds are more common and generally safer to remove yourself, though proper precautions should always be taken.
Safe DIY Mould Removal
For small areas (less than a square metre), mould can typically be removed safely at home. Always wear rubber gloves, safety goggles, and a P2 respirator mask. Mix 1 part bleach with 4 parts water, apply to the affected area, scrub, and wipe clean. Alternatively, undiluted white vinegar or a tea tree oil solution are effective natural options that don’t produce toxic fumes.
Addressing the Root Cause
Cleaning mould without addressing the source of moisture is only a temporary fix. Improve ventilation in affected rooms by installing or upgrading exhaust fans. Use a dehumidifier in particularly humid spaces. Repair any leaks promptly. In bathrooms, leave the exhaust fan running for at least 15 minutes after showering.
When to Call a Professional
If mould covers a large area, appears black, or returns repeatedly despite cleaning, it’s time to call a licensed mould remediation specialist. Large-scale mould problems can indicate deeper moisture issues within walls or subfloors that require professional assessment.
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