Red mould in homes and bathrooms | Causes and prevention

What is red mould

Red mould, also called red fungus, appears in shades of red, pink, or orange. It thrives in damp, poorly ventilated environments such as bathrooms, kitchens, basements, and laundry rooms. The mould can grow on tile, plasterboard, textiles, and wood where moisture collects.

Although it may look less alarming than black mould, red mould can still release spores that irritate the respiratory system and skin. Long-term exposure may worsen allergies or asthma.

If you suspect mould growth in your home, it is advisable to take a mould test to identify the type and extent of contamination.

Red mould in the shower and bathroom

Bathrooms are among the most common places for red mould to develop. Steam from showers and baths creates condensation on walls, ceilings, and grout, allowing spores to thrive.

You might notice reddish or orange patches around tile joints, silicone seals, or shower curtains. Keeping ventilation consistent, wiping down wet surfaces, and reducing humidity are key to preventing red mould in the shower and other bathroom spaces.

For more details on humidity control and moisture, read our guide on avoiding too much moisture.

Red mould on walls often indicates trapped moisture or insufficient insulation

Red mould on walls and other surfaces

Red mould on walls often indicates trapped moisture or insufficient insulation. It can appear behind furniture or wallpaper where air circulation is limited.

Regular inspections and humidity checks help prevent mould from spreading. Using hygrometers and moisture meters can make it easier to detect dampness before it becomes visible.

Red mould on food and plants

Red mould can sometimes appear on food such as bread or fruit when stored in warm, humid environments. It can also develop in flowerpots if the soil is overwatered or poorly ventilated.

If you find red mould in plant soil, remove the top layer and let it dry completely. Wash hands and tools thoroughly after handling contaminated soil to avoid spreading spores to other areas.

Exposure to red mould can lead to a range of health reactions depending on individual sensitivity. Common symptoms include sneezing, coughing, watery eyes, skin irritation, and breathing difficulties

Health effects of red mould exposure

Exposure to red mould can lead to a range of health reactions depending on individual sensitivity. Common symptoms include sneezing, coughing, watery eyes, skin irritation, and breathing difficulties. Prolonged exposure can worsen asthma or trigger allergic reactions.

People with respiratory conditions or weakened immune systems are more likely to experience discomfort when exposed to mould spores. If symptoms persist, consult a healthcare professional for advice.

For general information about mould and its health impact, visit our mould encyclopedia.

Preventing red mould

Prevention is the most effective way to protect your home and wellbeing. Keep air flowing, open windows regularly, and use extractor fans in bathrooms and kitchens. Wipe down wet areas promptly and avoid overwatering houseplants.

Strong mould prevention habits help maintain a dry and healthy home environment while reducing the risk of costly repairs. For more advice, see our page on preventing mould.

If you need further guidance or suspect a larger mould problem, you can always reach out via contact us.