How to Prevent Mould in Your Storage Unit

How to Prevent Mould in Your Storage Unit

Brisbane's subtropical climate means humidity is a constant factor - and humidity is the number one cause of mould in storage units. Whether you are storing household furniture, clothing, documents or business stock, mould can cause serious damage if you do not take the right precautions.

At Storage Land in Archerfield, we use sealed shipping containers on a sealed bitumen hardstand to give your belongings the best protection. But there are also steps you can take to keep mould from ever becoming a problem.

What Causes Mould in Storage?

Mould thrives in warm, damp and poorly ventilated spaces. In Brisbane, relative humidity often sits above 60%, which is the point where mould growth accelerates. Common causes include:

• Storing damp or wet items without drying them first
• Packing items in sealed plastic bags that trap moisture
• Placing items directly on an unsealed ground surface
• Using cardboard boxes that absorb moisture over time
• Poor airflow inside a tightly packed unit

7 Tips to Keep Mould Out of Your Storage Unit

1. Clean and Dry Everything Before Storing

Make sure every item is completely clean and dry before it goes into storage. Wipe down furniture, wash fabrics and let everything air dry thoroughly. Even a small amount of residual moisture can start mould growth in an enclosed space.

2. Use Moisture Absorbers

Place silica gel packs, DampRid containers or similar moisture absorbers throughout your unit. These are cheap, easy to find at Bunnings or hardware stores, and they make a real difference in keeping humidity levels down inside your container.

3. Choose the Right Packing Materials

Avoid sealing items in plastic bags or cling wrap - these trap moisture. Instead, use breathable materials like cotton sheets, moving blankets or acid-free tissue paper. For boxes, opt for sturdy plastic bins with ventilation holes rather than cardboard, which absorbs moisture. For more packing tips, check out our full guide.

4. Elevate Items Off the Floor

Even on a sealed surface, placing items directly on the ground can expose them to condensation. Use pallets, shelving or plastic risers to keep your belongings elevated. This also improves airflow underneath your items. See our storage unit layout tips for more ideas on organising your unit.

5. Leave Space for Airflow

Do not pack your unit wall-to-wall. Leave small gaps between items and the container walls to allow air to circulate. Good airflow is one of the simplest and most effective ways to prevent mould.

6. Avoid Storing Perishable or Organic Items

Food, plants and other organic materials are mould magnets. Keep these out of your storage unit entirely. For a full list of what you should and should not store, see our guide on prohibited items in storage units.

7. Check Your Unit Regularly

If possible, visit your unit every few weeks to inspect for any signs of moisture or musty smells. Catching a problem early makes it much easier to fix before any real damage occurs.

Why Container Storage Helps Prevent Mould

Shipping containers are built from steel and designed to withstand ocean voyages - they are inherently more resistant to moisture than timber or brick storage sheds. At Storage Land, our containers sit on a sealed bitumen surface which prevents ground moisture from seeping up, unlike crusher dust yards.

Combined with Brisbane's warm, dry winter months and proper packing techniques, container storage is one of the most reliable ways to keep your belongings safe year-round.

How Much Does Mould-Safe Storage Cost?

Quality storage does not have to be expensive. At Storage Land, our 20ft shipping containers start from just $40 per week - and that includes insurance, a sealed hardstand, and 24/7 security. Compare that to traditional indoor storage in Brisbane and you will find our prices are significantly lower.

Frequently Asked Questions

Can mould grow in a shipping container?

Yes, mould can grow in any enclosed space if there is enough moisture. However, steel containers are far more resistant to mould than timber or brick units. With proper packing and moisture control, the risk is very low.

What is the best moisture absorber for storage?

DampRid and silica gel packs are the most popular and effective options. For a 20ft container, two or three DampRid tubs placed at different points will help keep humidity in check.

How often should I check my storage unit for mould?

We recommend checking your unit at least once a month, especially during Brisbane's humid summer months. A quick visual inspection and sniff test is usually enough to catch any early signs.

Does Storage Land have ventilated containers?

Our shipping containers have standard ventilation points built in. Combined with our sealed bitumen hardstand and the naturally well-drained Archerfield site, our units offer excellent protection against moisture buildup.