Brown Mould: Is It Harmful, What’s Causing It and How to Remove It

Have you noticed strange brown patches across your walls or ceiling? Is the paint or wallpaper starting to peel? How about the smell? Do you detect something musty?

If all these are a yes, you likely have brown mould. Don’t worry; it’s not too late, hopefully. Let’s dive into everything you need to know about it and how to remove it.

What is the brown stuff on the walls and ceiling?

This particular mould on your walls or ceiling is often caused by fungi such as Stachybotrys chartarum or certain strains of Aspergillus. Brown mould can appear slimy or fuzzy. Its texture depends on moisture levels and the type of surface it grows on. The texture sets it apart from the powdery texture of some green moulds.

Brown shade can range from light to dark. Unlike black mould, which often appears jet black, or green mould, which is bright, brown mould ranges from light tan to deep chocolate colour. In a nutshell, that’s the difference between brown mould, black mould and green mould.

How quickly it grows often depends on the conditions in your home. It is particularly opportunistic in warm, damp environments. Its ability to cling to porous surfaces like wood or drywall makes it challenging to fully remove.

Still, brown mould often gets overlooked. It’s because it doesn’t have the notoriety of black mould or the visual shock factor of bright green mould. While it may not produce toxins as aggressive as black mould, its presence can still weaken structures over time. You don’t want it on wooden beams or drywall. It also contributes to respiratory problems, much like other mould types.

Identifying brown mould in households

Brown mould is often easy to spot once you know what to look for.

And what does brown mould smell like? Well, typically has a musty or earthy odour, similar to damp, decaying wood or wet soil. The smell of mould can be quite strong in bathrooms with poor ventilation. Kitchens can also develop this mould, especially near sinks or dishwashers. And let’s not forget basements and attics. These are prone to moisture buildup.

If you notice dark or light brown patches on walls or a musty smell, test for mould. DIY kits are available online or in stores. These kits usually involve taking a sample from the affected area and sending it to a lab for analysis.

If the mould problem seems bad, call a professional. They have the tools to test and assess the mould. They can also identify hidden moulds, which might not be visible.

Causes of brown mould’s growth

Mould occurs when moisture and airflow are out of balance. Poor ventilation and excess humidity cause ceiling mould. But that’s not the only reason.

What causes brown mould on walls can also be caused by leaks or condensation. Brown marks on ceilings, for example, can form when water from a roof leak or a burst pipe seeps through. It creates the perfect environment for mould growth.

Is brown mould harmful?

The common question on your mind once you find the fungi probably is “Is brown mould dangerous?” The answer is yes, especially if the mould has been left untreated for a long time.

Mould spores in the air can irritate the respiratory system. People with asthma, allergies, or weakened immune systems are more susceptible. Prolonged exposure can cause headaches, coughing, and skin irritation.

While brown mould might not be as aggressive as black mould, it’s still important to address it early. The longer it’s left unchecked, the more it can spread and the greater the potential for health issues.

How do you get rid of brown mould?

You have two options when it comes to what to do about brown mould on the ceiling.

DIY removal techniques

Before you start cleaning, make sure to protect yourself. Wear gloves, goggles, and a mask to avoid exposure to mould spores. It’s also a good idea to wear old clothing that can be easily washed.
For small areas or starting infestations, there are safe homemade cleaning solutions that you can use.

When tackling brown mould on walls, ceilings, or carpets, be cautious about using harsh chemicals, especially bleach. What kills brown mould is a balance of effective cleaning and proper ventilation. Overrelying on bleach alone might end up in a disaster. So,

1. Do not use too much bleach. It can create toxic fumes and is less effective on porous surfaces like wood or drywall;
2. Do not scrub the mould without proper ventilation. This can increase your exposure to spores;
3. Do not ignore hidden mould in areas like behind walls or under carpets.

Professional mould treatments

If the infestation is extensive or hard to manage, it’s better to call in certified mould remediation specialists. They know how to treat brown mould safely and effectively. The specialists can carry out:

Costs can vary depending on the size of the infestation and the treatment method. Generally, mould removal services can range from £300 to £3,000. Always get a quote and ask for an inspection before committing to treatment.

Preventative tips

Whichever method you choose for your mould removal, it’s important not to let the fungi return.

Control humidity

1. Use dehumidifiers in damp areas like basements or bathrooms;
2. Maintain airflow by using fans or opening windows during dry seasons;
3. In very humid climates, consider using a humidistat to regulate moisture levels automatically.

Do regular checks and maintenance

1. Inspect plumbing regularly for leaks that could lead to mould growth;
2. Clean gutters frequently so water doesn’t collect and seep into your home;
3. Install proper insulation in attics and walls to prevent condensation.

Is it safe to clean brown mould yourself?

Cleaning brown mould yourself can work. You need to be cautious, though. Many people wonder “Does cleaning mould make it spread?”. When you scrub the mould, it can release spores into the air. This might lead to more mould growing in other areas. So, it’s important to clean in small sections and be gentle.

You absolutely need protective gear. What happens if you clean mould without a mask? You could end up inhaling mould spores. They can cause breathing problems or allergies. Always wear a good N95 mask, and don’t forget gloves and goggles to protect yourself from spores and cleaning chemicals.

What if the brown mould keeps coming back?

Persistent brown mould is often a sign that excess moisture remains unresolved. Start by checking for leaks in plumbing, roofing, or windows. Even minor leaks can create ideal conditions for mould growth.

Poor ventilation can also lead to recurring issues. Damp areas like bathrooms, kitchens, and basements are especially vulnerable. These spaces need to be well-ventilated, so use exhaust fans, dehumidifiers, or simply open windows when possible.

Mould might also be hiding in unseen areas. Examples include behind walls or under carpets. If cleaning the visible spots doesn’t resolve the issue, a professional mould inspection can help identify hidden sources.

Finally, improve insulation, clean gutters regularly, and seal cracks to minimise moisture buildup.