As temperatures drop, UK households are being urged to open their windows for 10 minutes each day to prevent hidden damp and mould. Experts warn that mould can form behind walls, under floors, or in lofts long before any visible signs appear, posing serious health risks.
Ben Snape from IntelOptic, a home health app, explains that early warning signs include a musty smell, cold walls, and soft, bubbling paint. Mould can start forming in as little as 48 hours after humidity exceeds 70% and may remain hidden for up to 18 months.
Mould is not just a cosmetic issue; it can trigger asthma, chronic coughing, skin irritation, fatigue, and sleep problems, with children and older adults most at risk. Condensation on glass and mirrors typically dries with ventilation and leaves no smell, while damp lingers on walls and skirting boards, often with a persistent musty odour.
To combat this, experts recommend improving airflow by opening windows for brief, intense periods of five to 10 minutes once or twice daily, ideally when it's warmest and sunniest. Opening windows on opposite sides of the house creates a cross-breeze, which helps remove stale air and moisture.
Avoid using bleach to clean mould, as it can cause deeper growth. Instead, monitor humidity with a hygrometer and move furniture away from walls. Proper ventilation not only prevents mould but also improves indoor air quality, reducing headaches, nausea, and respiratory infections.
