Mould is an issue that many tenants face, and if left untreated, it can cause damage to both your property and your health. While some mould growth is minor and manageable, larger infestations can be a sign of underlying problems that need professional attention.
This guide will help you understand what mould is, how it forms, where it thrives, and most importantly, how to prevent and treat it effectively.
What is Mould?
Mould is a type of fungus that grows in damp and humid conditions. Unlike plants, mould cannot create its own food through photosynthesis. Instead, it feeds on organic materials, such as wood, fabric, and paper, breaking them down over time. This is why unchecked mould growth can lead to serious damage in a home.
Mould spores are microscopic and can float in the air, spreading easily. However, they only grow into visible mould colonies when they land in areas with the right conditions. Typically, mould appears as black, brown, green, or even orange patches, depending on the type and the surface it is growing on.
What Causes Mould to Grow?
Mould needs four key factors to grow:
- Moisture – This could be from leaks, condensation, or high humidity levels.
- A Food Source – Organic materials such as timber, fabric, and even dust provide nutrients for mould.
- The Right Temperature – Mould thrives in warm, damp environments, usually between 10-30°C.
- Lack of Sunlight – Direct UV exposure can kill mould spores, so it often grows in dark or shaded areas.
If these conditions are present, mould can spread rapidly throughout your home.
Where is Mould Most Likely to Occur?
Mould can develop in many hidden places around your home. While you may notice it in obvious spots, such as bathroom walls, it can also thrive in less visible locations. Here are some common areas to check:
- Bathrooms – Walls, ceilings, shower tiles, and under sinks.
- Kitchens – Behind fridges, under sinks, and inside cupboards.
- Bedrooms – Around windows, behind furniture, and on walls.
- Living Areas – Carpet and upholstery (especially after spills).
- Laundry Rooms – Around washing machines, dryers, and damp clothing.
- Storage Areas – Basements, garages, and cluttered spaces with poor ventilation.
It's important to inspect these areas regularly, especially in winter when condensation and humidity levels tend to rise.
Why is Winter the Worst Season for Mould?
Mould can grow year-round, but it becomes particularly problematic in winter due to:
- Increased indoor humidity – Using heaters and keeping windows closed traps moisture inside.
- Reduced sunlight – Less natural light exposure allows mould to spread unchecked.
- Condensation – The temperature difference between indoor air and cold windows or walls can cause condensation, creating an ideal breeding ground.
- Drying clothes indoors – This increases humidity, making it easier for mould to develop.
- Unnoticed leaks – Rainfall and moisture build-up in walls or roofs can go undetected until mould appears.
If you notice signs of mould during colder months, it's important to act quickly before the problem worsens.
How to Prevent Mould Growth
The best way to manage mould is to prevent it from forming in the first place. Here are some practical steps tenants can take:
Improve Airflow
- Open windows and doors whenever possible to allow fresh air to circulate.
- Use exhaust fans in bathrooms and kitchens to reduce moisture build-up.
- Keep internal doors open to promote air movement throughout your home.
Control Humidity
- If you notice condensation on windows, wipe it away promptly to prevent moisture build-up.
- Avoid drying clothes indoors where possible—use an outdoor clothesline or a well-ventilated area.
- Consider using a dehumidifier in particularly damp areas.
Keep Your Home Clean
- Regularly vacuum and dust to prevent mould spores from settling on surfaces.
- Clean bathroom tiles and walls frequently to remove moisture and soap scum.
- Check behind furniture, cupboards, and appliances for hidden moisture.
Let in Natural Light
- Open curtains and blinds during the day to allow sunlight to reach dark corners.
- If possible, rearrange furniture so that airflow and sunlight can reach previously hidden areas.
Address Leaks and Damp Areas
- If you notice a water leak, report it to your property manager or landlord immediately.
- Dry spills and wet surfaces quickly to prevent moisture build-up.
By following these steps, you can significantly reduce the likelihood of mould developing in your home.
What to Do If You Find Mould
If you discover mould in your home, take action quickly to stop it from spreading.
Small Mould Patches (DIY Treatment)
For minor mould growth, you can try the following methods:
- Mix white vinegar and water (1:1 ratio) in a spray bottle and apply it to the affected area. Leave it for an hour before wiping it off.
- Use baking soda mixed with water to scrub away mould from tiles and walls.
- Keep the area dry and ventilated to prevent regrowth.
Large or Persistent Mould Growth (Professional Help Required)
If mould keeps returning despite your efforts, or if it covers a large area, you should notify your property manager. A professional mould remediation service may be required to identify and fix the root cause, whether it's a hidden leak, high humidity, or inadequate ventilation.
Who is Responsible for Mould in a Rental Property?
Responsibility for mould in a rental property depends on its cause:
- Tenant Responsibility – If mould is caused by poor ventilation, unreported spills, or not cleaning properly, the tenant may be required to resolve the issue.
- Landlord Responsibility – If mould results from structural issues, leaks, or pre-existing damp problems, it is the landlord's responsibility to arrange for repairs.
If you notice mould forming, report it to your property manager as soon as possible so that it can be addressed before it becomes a bigger problem.
Need Help with a Mould Issue?
If you're dealing with mould in your rental property and need assistance, don't hesitate to reach out to us. Whether it's advice on prevention, reporting a maintenance issue, or arranging professional mould removal, we're here to help.
EMAIL: newcastle.com.au">hello@c21newcastle.com.au
PHONE: 02 4943 6333
ADDRESS: 155 Pacific Highway, Charlestown NSW 2290
Stay proactive in keeping your home mould-free, and let us know if you need support!