Storing a mattress incorrectly can lead to permanent sagging, hidden mould, and structural damage. To keep it in peak condition, clean it thoroughly, use a breathable cover, and store it flat whenever possible.

Avoid damp garages and always lift it off the floor to ensure it’s ready for a good night's sleep when you need it again.

How to Store a Mattress the Right Way: Avoid Mould, Sagging, and Damage

You’ve invested in a quality bed that supports your sleep perfectly, but life often requires a change. Whether you are moving or renovating, knowing how to store a mattress is essential to prevent permanent damage.

While they handle our weight daily, mattresses are surprisingly sensitive when left sitting the wrong way. Poor storage leads to "dips," lumpy foam, and trapped moisture that invites mould.

Many people pull their beds out of a garage only to find them musty and unusable. The good news? This damage is easy to avoid with the right preparation.

What we’ll cover:

• Preparation: Why cleaning and drying are non-negotiable.

• Protection: Choosing the right cover to prevent moisture traps.

• Positioning: Settling the "flat vs. upright" debate for mattress storage.

• Environment: Why the garage isn't always your friend.

• Recovery: How to freshen up your bed after its "holiday."

Why Mattress Storage Goes Wrong

Storing a mattress feels like it should be simple: find a space, put it there, and grab it later. 

However, beds are engineered to handle weight while lying flat. When you change that equation, things can go south quickly.

The Hidden Vulnerability of Modern Beds

Most modern mattresses use layered technology. You might have a spring system at the core with foam comfort layers on top. Each layer has a job, and they work best when aligned horizontally.

If you store a mattress upright for too long, gravity pulls on those layers unevenly. Foam can compress, and springs may shift. While you might not see it right away, you’ll definitely feel the lack of support once you lie down.

Memory foam and hybrid models are particularly at risk because their soft layers are prone to permanent "creep" or shifting.

Humidity is the other silent enemy. Beds absorb moisture from the air. In a well-ventilated bedroom, this isn't an issue. But in a sealed storage unit or a damp garage, that moisture gets trapped.

Over time, this creates the perfect home for mould, often deep inside, where you won't smell it until it's too late.

Preparing for Long-Term Mattress Storage

Before your mattress goes anywhere, it needs a bit of "TLC." This takes about an hour but makes a massive difference in how the bed feels a year from now.

Clean Thoroughly and Dry Completely

Start by vacuuming the entire mattress, including the sides and seams. This removes dust, skin cells, and allergens.

If you find any stains, spot-clean them with a mild solution, but be careful not to soak the material.

The most important step is letting it air out. Give it several hours to breathe before you wrap it up. Any leftover moisture from cleaning or even just daily use can become a problem if it's sealed inside.

A dry, breezy day is perfect for this; keep it out of direct, harsh sunlight to protect the foam.

Use Proper Protection

Many people reach for thick plastic wrap or bin bags. Unfortunately, non-breathable plastic traps moisture inside, which is a recipe for mildew.

Instead, look for a breathable mattress storage bag. These are designed to keep dust and pests out while letting air move through. If you want an extra layer of safety, keeping a high-quality mattress protector on the bed under the storage bag provides a great secondary barrier against dust.

The Big Debate: Flat or Upright?

We often get asked if it’s okay to store a mattress upright. Here is our honest expert advice based on how beds are built.

Flat Storage is King

Whenever possible, store your mattress flat. This keeps the internal structure exactly as the manufacturer intended.

To avoid moisture from the floor, don't put it directly on concrete. Use a pallet, a layer of cardboard, or a sheet of plywood to create a "breathing" barrier.

If You Must Store It Upright…

If space is tight and you have to store a mattress upright, follow these rules to minimise the risk:

• Support it well: Don't let it lean at a weird angle; keep it as vertical as possible between two flat surfaces.
  
  

• Rotate it: Every few weeks, flip it or turn it so the weight doesn't sit on one side for too long.
  
  

• Limit the time: A few weeks upright is usually fine, but for long-term mattress storage, flat is the only way to go.

Where to Keep Your Bed (and Where Not To)

The environment is just as important as the position.

Storing a Mattress in Garage Spaces

Putting a mattress in garage storage is very common, but it comes with risks. Garages often have huge temperature swings and high humidity.

If this is your only option, ensure the bed is elevated off the floor and checked regularly. Concrete floors can "sweat," and you don't want your bed soaking up that dampness.

Storage Units and Spare Rooms

A climate-controlled storage unit is the gold standard because it stays at a steady temperature. If you’re using a spare room, make sure it isn't a "dead" corner with no airflow.

If you’re worried about the warranty during this process, you can always check our warranty guidelines for more info on proper care.

Getting Your Bed Back into Action

When it's time to bring your mattress back, give it some time to wake up. Take off the covers and let it air out for a few hours. Vacuum it one more time to freshen it up.

If you notice a musty smell that won't go away, or if the bed feels significantly "dipped" in the middle, the structure might have been compromised.

Often, a fresh mattress topper can add a layer of comfort, but if the support core is gone, it might be time for an upgrade.

Your Mattress Storage Questions Answered

Is It Safe to Fold My Mattress for a Move?

We don't recommend folding any mattress unless it was specifically designed to be rolled (like a "bed-in-a-box").

Folding can snap the border wires in innerspring beds or cause permanent "hinge" marks in foam, ruining your sleep comfort.

How Often Should I Check on My Stored Bed?

If you're storing it for more than a month, check it every 3 to 4 weeks.

Look for any signs of dampness on the cover, and give the room a quick sniff for musty odours. It only takes a minute, but it saves a lot of stress.

Can I Stack Things on Top of the Mattress?

No, please avoid this! Heavy boxes can cause permanent indentations in the foam layers.

Your mattress should be the top item in any "flat storage" stack to ensure even, light pressure.

Do I Need to Buy a Specific Bag for an NZ-Made Bed?

While New Zealand-made beds are sturdy, they face our unique humid climate. Any high-quality, breathable bag will work, but make sure it’s the right size so it doesn't bunch up the corners of the bed.

What If I Find a Small Spot of Mould?

If it's just on the surface and very small, you might be able to clean it with a specialised fabric cleaner and dry it thoroughly.

However, if the smell is strong, the mould is likely inside the layers, which can be a health risk.

Small Steps Today for Better Sleep Tomorrow

A good mattress is an investment in your health that is hard to repair once damaged. By following these steps, you ensure your bed stays as fresh as the day you bought it.

When you’re ready for a bed built to last - or the accessories to keep it safe, contact us or check our full FAQs for more tips!