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Black Mould on Walls – What Causes It?
Black mould on walls is one of the most common damp-related problems found in homes. It often appears as dark spots or patches on painted walls, ceilings or around windows.
Mould growth occurs when moisture remains on surfaces for long periods. Warm indoor air containing humidity can condense on colder wall surfaces, creating the conditions mould needs to grow.
Although mould can sometimes be cleaned from surfaces, it will usually return unless the underlying moisture problem is addressed.
Why Black Mould Forms on Walls
Black mould develops when moisture levels remain high in a property. Condensation forming on cold walls provides the damp environment mould spores need to grow.
Poor ventilation, high humidity levels and cold external walls can all contribute to mould growth.
Black Mould Caused by Condensation
Condensation is the most common cause of black mould on walls. Everyday activities such as cooking, showering and breathing release moisture into the air.
If this moisture cannot escape through ventilation, it can settle on colder surfaces where mould begins to develop.
Other Damp Problems That May Cause Black Mould
Although condensation is usually responsible, black mould may also develop when penetrating damp or hidden moisture affects walls.
External defects allowing water to enter the wall structure can sometimes contribute to mould growth.
Black Mould on Bedroom Walls
Bedrooms often experience mould problems because humidity levels increase overnight while ventilation is limited.
Black Mould Around Windows
Window areas are colder than surrounding walls, making them more prone to condensation and mould growth.
Black Mould in Corners of Rooms
Room corners often have limited airflow, allowing moisture to remain on surfaces and encouraging mould development.
When Black Mould Should Be Investigated
If black mould continues to return after cleaning or spreads across walls and ceilings, it may indicate an ongoing moisture problem within the property.
A professional damp survey can determine whether condensation, penetrating damp or other moisture issues are responsible.
Book a Damp Survey for Black Mould Problems
If black mould is appearing on walls in your home, Dampline provides professional damp surveys across Durham and surrounding areas.
Our damp surveys identify the cause of moisture problems so the correct solution can be recommended.
Book a damp survey today to investigate mould and damp issues affecting your property.