Persistent mould isn't always caused by leaky pipes or poor insulation. Often, our own habits encourage mould growth, from simple mistakes while cooking to how we do the laundry.
Black mould poses a risk to both the home and the health of its residents. Airborne spores can settle into our airways and lungs, potentially causing respiratory and skin issues. Meanwhile, as it spreads across walls and furniture, the multicellular fungus feeds on organic materials, gradually compromising the structural integrity of the home.
Once a home is infested, mould can be difficult to eliminate. That's why it's important to understand what causes it – and how to prevent it from developing in the first place.
Below, John Zentveld, cleaning expert at HG, a retailer of specialist cleaning products, shares which five habits could be causing mould in your home.
1. Drying clothes indoors
Why it's a problem: Air-drying clothes is common in many households. While it's simple and energy-efficient, it comes with a drawback. 'This practice releases a large amount of moisture into the air. When it accumulates on walls, ceilings, and furniture, it can trigger condensation, creating a breeding ground for mould,' says John.
What you can do: To minimise the risk, it's best to use a tumble dryer with external venting. If you prefer to air-dry your clothes, do so in a well-ventilated room – ideally with extractor fans, open windows or a dehumidifier (or all three).
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2. Boiling food with lids
Why it's a problem: 'Cooking is another unsuspected culprit,' says John. 'Boiling water or simmering food without covering pans releases steam into your home.' The steam then condenses on surrounding surfaces, creating damp spots that are ideal for mould growth.
What you can do: A simple solutions is to put lids on your pans and pots whenever possible. This not only minimises the steam released into the air but also saves energy as you won't need to turn the heat up as high. Always switch on extractor fans or open a window while cooking.
3. Pushing furniture against external walls
Why it's a problem: Placing large pieces of furniture, like sofas, wardrobes or beds, against external walls can block airflow and trap moisture in hidden corners. 'Over time, this can cause damp patches and mould growth, particularly in older properties or homes with minimal ventilation,' says the expert.
What you can do: You don't need to completely rearrange your home. Simply leave a small gap between furniture and the wall to allow air to circulate and help moisture to evaporate naturally.
4. Hot showers without ventilation
Why it's a problem: Bathrooms are condensation hotspots. 'Warm showers create clouds of steam that cling to walls, mirrors, and ceilings. Without ventilation, such as an extractor fan or an open window, this moisture settles and promotes mould growth,' John warns.
What you can do: Using an extractor fan or a dehumidifier is highly recommended in high-humidity spaces like bathrooms. For extra airflow, open windows during or after showering. In homes that are particularly prone to damp, wiping down surfaces after showing can also help reduce moisture.
5. Ignoring small leaks or damp patches
Why it's a problem: 'Even minor leaks or damp marks can escalate if left untreated,' John warns. 'Moisture can seep into walls, ceilings or skirting boards, weakening plaster and paint and encouraging mould growth.'
What you can do: Regularly check areas prone to damp. 'Inspect problem areas regularly, look for signs of peeling paint and check for unusual odours, which can be an early warning of hidden damp,' John recommends.
