The 10 Essential Prevention Steps
- Use a dehumidifier - Run 4-6 hours daily to maintain 55-60% humidity
- Improve ventilation - Open windows when weather permits, use fans for circulation
- Run exhaust fans - Keep bathroom/kitchen fans on during and after use
- Check for leaks - Inspect pipes, windows, and roof areas regularly
- Don't dry clothes indoors - Use dryers or covered outdoor areas
- Maintain aircon - Service regularly to prevent condensation issues
- Use moisture absorbers - Place in wardrobes, shoe cabinets, bomb shelters
- Keep furniture away from walls - Allow 5-10cm gap for air circulation
- Clean regularly - Wipe down susceptible areas weekly with anti-mould solution
- Monitor humidity - Use a hygrometer to track levels throughout your flat
High-Risk Areas in HDB Flats
- Bomb shelter - Enclosed, no ventilation, often used for storage
- Bedrooms near external walls - Temperature differential causes condensation
- Bathrooms without windows - Moisture traps after showering
- Behind furniture - Limited air circulation
- Wardrobes and shoe cabinets - Enclosed with organic materials
Frequently Asked Questions
Why is monsoon season particularly bad for mould in HDB flats?
Monsoon season brings sustained high humidity (often exceeding 90%), frequent rain that prevents natural drying, and reduced sunlight. HDB flats with limited cross-ventilation and concrete walls that absorb moisture become particularly susceptible during these months.
What humidity level should I maintain to prevent mould?
Keep indoor humidity between 50-60% for optimal mould prevention. Use a hygrometer to monitor levels. Above 70% humidity creates ideal conditions for mould growth. In Singapore's climate, this typically requires air conditioning or dehumidifiers.
How often should I run my dehumidifier during monsoon?
Run your dehumidifier for at least 4-6 hours daily during monsoon season, or continuously in particularly humid rooms. Empty the tank regularly. Set it to maintain 55-60% humidity. Running it overnight in bedrooms can significantly reduce morning condensation.
Are exhaust fans effective for preventing mould in HDB bathrooms?
Yes, exhaust fans are essential for HDB bathrooms. Run them during and for 20-30 minutes after showering. Clean fans monthly to maintain effectiveness. For bathrooms without windows, consider upgrading to a more powerful extraction unit for better moisture removal.