Whether it's an indoor or outdoor storage unit, having your own storage space is undeniably useful. Using a storage unit might seem as simple as storing your things inside and being done with it. However damaging moisture can seep into a unit and cause damage to your belongings.
Nowadays, you can find a storage facility that can offer you a climate-controlled storage unit that will keep moisture low, but if you don't have access to one of these, you'll have to find your own way to keep moisture levels low.
In this article, we'll guide you through practical steps to keep your storage unit moisture-free, ensuring your belongings stay in top condition.
How does moisture build up in storage units?
Moisture in storage units can be caused by several factors, most commonly because of the local climate and poor ventilation. Outdoor weather conditions can impact your storage unit, even if it's inside. Humid air seeps inside through new cracks or gaps in the unit, leading to condensation and moisture build-up.
Here are some key factors that affect the humidity level inside storage units:
- Local climate – High humidity levels can cause condensation.
- Poor ventilation – Lack of air circulation can trap moisture.
- Inappropriate packing materials – Cardboard boxes absorb moisture, making them less ideal for long-term storage. Plastic is a good alternative.
Excess moisture in a storage unit can be severe. Mould spores thrive in damp, dark environments. Mould damages your belongings and can create health hazards, particularly for those with allergies or respiratory issues.
- Mould growth: Damages items and poses health risks.
- Rust: Particularly damaging to metal items like tools or electronics.
- Warping and discolouration: Wood, fabric, and paper items are especially vulnerable.
What is a climate-controlled storage unit?
Climate-controlled storage units are your best bet to prevent mould from moisture buildup. Climate control lets you control the temperature and humidity, block outdoor moisture and protect your belongings. If you’re storing sensitive items like electronics or furniture, a climate-controlled (or at least climate-secure) unit is often worth the investment.
You could also consider the location of the storage unit. This is more important if you don't have a climate-controlled unit. Find a unit in a place that is less likely to get damp. An indoor storage unit is best.
Check your storage unit regularly
Check the unit before renting it, inspecting it for cracks and holes. Damages to the storage wall can increase the amount of moisture that gets in.
Remember to check your unit periodically as new potential leaks could appear at any time. It's important to maintain your unit to stop any leaks from appearing. A well-maintained unit should have tight seals around doors and windows to prevent outdoor moisture from getting inside. Here are some key points on what to do when inspecting your unit.
- Inspect for leaks – Look for cracks, leaks, or gaps.
- Check ventilation – Ensure the unit has adequate air circulation.
- Seals – Tight seals around doors and windows prevent moisture entry.
Keep your items dry
Before you store your items, they should be completely dry. Even if an item is only slightly wet, it will let moisture and mould seep inside and damage everything else. Mould and mildew love damp things, and will grow on your belongings at the slightest hint of moisture.
Proper packing can make a significant difference in preventing moisture damage. Instead of cardboard boxes, consider using plastic storage containers. For items that need extra protection, vacuum-sealed bags are a great option—they remove air (and thus humidity) from the equation entirely.
- Plastic storage containers – More effective at keeping moisture out.
- Vacuum-sealed bags – Ideal for extra protection, particularly for sensitive items.
- Lining cardboard boxes – If you have to use cardboard boxes, use a plastic tarp or plastic sheet to create a moisture barrier.
- Use wooden pallets – Wooden pallets can keep your items off the ground, keeping mould spores away from them
Keeping moisture out of your storage unit
Not all storage facilities have climate control options, making it up to you to prevent mould growth. Fortunately, there are simple ways you can keep the relative humidity low and protect your belongings without too much work.
Installing a vapor barrier
A vapor barrier is a polyethylene plastic sheet that covers a storage wall, acting as a barrier against outdoor moisture.
If possible, a vapor barrier should also be installed beneath or onto the floor to prevent moisture from the ground from coming inside.
Make some desiccants
Desiccants can absorb moisture. Silica gel packs are a great moisture absorbent.
One of the simplest ways to absorb moisture in a storage unit is to use silica gel packs or other desiccants. They take in moisture from the air around them. You can purchase silica gel packs in bulk or even make them yourself at home. Place these packets inside boxes, drawers, or directly on the shelves.
If you want to make them yourself, the two things you'll need are:
Fabric – Cut two pieces of cloth into small squares or rectangles and sew them together, leaving an opening on one side.
Silica gel – Purchase silica gel to fill in the pouch you made, sewing up the top afterwards.
If you already have silica gel, then making your own pouches may be sensible. If you don't then it may be simpler to purchase the packet in bulk from a storage company or a hardware store.
Bring in some dehumidifiers
A portable dehumidifier can be a great investment. These devices work by extracting excess moisture from the air, which is especially useful in larger storage spaces or units located in particularly damp environments.
If your storage unit has any plug outlets, a dehumidifier and air conditioners are good devices to maintain the temperature and humidity levels in a storage unit without opting for a climate-controlled unit.
Charcoal
Charcoal is a natural alternative to reducing moisture levels in your storage unit. As an alternative to silica gel packs, charcoal can be used the same way. Just place a few briquettes in an open container and leave them in your unit—they’ll do the rest.
Charcoal also eliminates odours, making your storage unit smell fresh and clean. Be careful when using charcoal briquettes, as they can easily stain fabrics and clothes.
Conclusion
Preventing moisture in your storage unit is all about being proactive. By choosing the right storage facility, using moisture-resistant materials, and regularly maintaining your unit, you can keep your belongings safe from the perils of excess moisture. A little effort now can save you a lot of trouble (and money) down the line.
HOLD Self-Storage will keep your belongings moisture-free.
In need of self-storage in London? HOLD Self-Storage has all kinds of storage units to suit your needs. There are state-of-the-art storage facilities, including climate-secure units to protect your belongings from humidity. Whether it's long-term or short-term storage, our Kings Cross facility has you covered with competitive prices, advanced security, and top-notch customer service.
Contact us today for a free quote or to learn more about how we can help you keep your stored items safe and dry.
Frequently asked questions
What can I put in my storage unit to absorb moisture?
Silica gel packs, charcoal, and dehumidifiers can all absorb moisture from the air to keep your belongings dry.
What is the ideal humidity level for storage?
45-55% relative humidity levels are recommended. However, 30-50% is also a good range. Above 55%, you may start seeing damages to your belongings, so it's better to try and keep it at the lower end.
How to deal with mould in a storage unit?
Clean the affected area first, and then use either bleach or water and vinegar for a deeper clean. Remove affected items and clean them separately. You'll want to take out all sources of mould before you start placing items back in.
What notice do I have to give on my storage unit?
We require one month's notice; unused rent and deposit are refunded upon checkout.
Are there any concessions or discounts at HOLD?
Yes, we offer introductory self-storage offers for new customers. Please get in touch or get an online quote for free to see what offers are available.
