Why Bomb Shelters Get Mouldy
HDB Household Shelters (bomb shelters) are uniquely prone to mould due to:
- No Windows: Zero natural ventilation by design
- Thick Concrete: Walls retain moisture and stay cool
- Sealed Design: Required airtight door traps humidity
- Storage Use: Cardboard boxes and fabric items provide mould food
- Rarely Opened: Infrequent access means moisture accumulates
- Adjacent to Bathroom: Often located near moisture sources
What You Can Store (Low Risk)
- Plastic containers (sealed)
- Metal items
- Glass items
- Items in airtight vacuum bags
What to Avoid Storing (High Risk)
- Cardboard boxes (absorb moisture)
- Clothes and fabrics
- Leather goods (bags, shoes)
- Books and documents
- Mattresses or bedding
Prevention Strategies
- Keep the door open when possible
- Use a dehumidifier (run regularly)
- Place moisture absorber boxes throughout
- Store items in plastic containers, not cardboard
- Use vacuum-sealed bags for textiles
- Apply anti-mould paint on walls and ceiling
- Clean monthly and check for early mould signs
- Avoid storing recently washed/damp items
Frequently Asked Questions
Why is my bomb shelter always mouldy?
Bomb shelters are designed as enclosed concrete rooms with no windows and minimal ventilation. The thick concrete walls can retain moisture and the sealed environment traps humidity. In Singapore's climate, this creates ideal conditions for mould.
How do I prevent mould in my bomb shelter?
Keep the door open when possible, use a dehumidifier or moisture absorbers, avoid storing moisture-sensitive items, ensure items are dry before storing, and consider anti-mould paint on walls and ceiling.
Is bomb shelter mould dangerous?
Yes, bomb shelter mould can spread to stored items and the spores can enter living spaces when the door is opened. Items stored in mouldy bomb shelters often develop mould damage.
Can I convert my bomb shelter to reduce mould?
HDB regulations limit modifications to bomb shelters. You cannot add windows or permanent ventilation. However, you can install dehumidifiers, use moisture absorbers, and apply anti-mould paint within regulations.