Which of the following is a common source of mould contamination?

Mould contamination is commonly associated with water-damaged buildings because mould thrives in damp environments where moisture is present. When building materials such as wood, drywall, or carpeting are exposed to water—whether from leaks, flooding, or high humidity—microbial growth can occur. Mould spores, which are naturally present in the air, can easily colonize these moist surfaces, leading to unhealthy indoor air quality and potential health risks for occupants.

In contrast, fresh paint does not typically serve as a source of mould; rather, it can act as a barrier if it contains antifungal properties. High ventilation rates usually help reduce humidity levels, thereby making conditions less favorable for mould growth. Proper insulation, when installed correctly, can also prevent moisture accumulation in buildings by maintaining temperature control and reducing condensation.