Mould in Buildings: What Causes It, Its Effects, and What to Do About It.
Mould in buildings is more than an unpleasant sight. It can signal an underlying moisture problem that needs attention. You may notice mould on walls, ceilings, floors, around windows or in areas with poor ventilation. If left untreated, it can continue spreading and cause further damage to the building.
So, what causes mould, how can it affect people and buildings, and what should you do when you find it?
What Causes Mould in Buildings?
Mould grows when moisture, warmth and organic material create suitable conditions for growth. Buildings can develop these conditions for several reasons.
Water leaks are a common cause. A leaking roof, damaged pipe or faulty plumbing can introduce moisture into walls and ceilings. Similarly, water can enter through damaged roofing, failed waterproofing or gaps around windows and doors.
Poor ventilation can also contribute to mould growth. Bathrooms, kitchens and other humid areas produce moisture through everyday activities. Without adequate airflow, that moisture can remain on surfaces and encourage mould.
Condensation is another common issue. When warm, moist air meets a cold surface, water droplets can form. Over time, repeated condensation can create a damp environment where mould can grow.
How Can Mould Affect Your Health?
Mould can affect indoor air quality, particularly when it grows across large areas or remains untreated. Some people may experience irritation when exposed to mould or mould spores.
Possible symptoms can include coughing, sneezing, a stuffy or runny nose, throat irritation and itchy or watery eyes. People with allergies or respiratory sensitivities may be more affected.
However, mould does not affect everyone in the same way. If occupants experience ongoing symptoms or have concerns about mould exposure, they should seek appropriate medical advice.
How Does Mould Damage a Building?
Mould can affect more than the appearance of a property. Persistent moisture can damage materials such as plasterboard, timber, insulation and paint.
You may notice staining, peeling paint, bubbling surfaces or a musty smell. In severe cases, prolonged moisture can contribute to timber deterioration and damage materials within walls or ceilings.
Importantly, removing visible mould does not always solve the problem. If moisture continues to enter the building, mould can return.
What Should You Do When You Find Mould?
First, identify the possible source of moisture. Check for visible leaks, water stains, condensation or areas with poor ventilation.
Next, assess the extent of the mould. Small surface growth may have a straightforward cause, but widespread mould or recurring growth can indicate a larger moisture issue.
Avoid simply painting over mould. This may hide the problem temporarily without addressing the moisture underneath.
For larger areas, persistent mould or suspected water damage, consider having the affected area professionally assessed. A building professional can help identify the source, determine the extent of the damage and recommend appropriate remedial work.
Don't Ignore Mould in Your Building
Mould is often a visible warning that something else is happening behind the scenes. Whether the cause is a leaking roof, poor ventilation, condensation or water damage, finding the source is essential.
By addressing moisture problems early, property owners and facility managers can help protect both the building and the people using it. When mould keeps returning or the damage appears extensive, professional assessment can help determine the right next step.