Stacking two mattresses on top of each other might seem like a simple way to add extra comfort or height to your bed, but is it really a good idea?
While it might work in some cases, there are several shortcomings to this, which we’ll discuss in this guide.
Things like mattress compatibility, support, and safety all play a role in whether this is a practical solution or not.
In this article, we’ll look at the pros and cons of stacking mattresses.
Can you stack one mattress on top of another?
If you sleep on two mattresses stacked on top of each other for a long period of time, you’ll most likely ruin both mattresses and void the warranties on both.
Additionally, you will most likely increase the likelihood that your bed will become a breeding ground for allergies and other undesirables.
Also, if you toss around a lot while you’re sleeping, the top mattress can move and even fall off.
Tip: If you want to get rid of your old mattress, check out our guide on how to you can donate it to a charity. Another option is to have it recycled or take it to the tip.
6 Reasons Why You Shouldn’t Stack Your Mattresses
Here are some of the most important reasons why you shouldn’t put two or more mattresses on top of each other.
1. Both mattresses will become damaged
It’s not a good idea to stack mattresses because it makes the overall structure unstable. The weight distribution on the bottom mattress will likely be off.
In any case, the weight pressing down on the bed would eventually destroy the mattress below.
The condition of the top mattress won’t improve over time, either. Particularly with a memory foam mattress, impressions, sags, and dips will develop over time.
The added weight will cause the bottom mattress to sink between the slats of a bed. The bottom of the top one will always start to protrude in the same spots over time. Adding more slats to the bed won’t prevent it from sagging either.
2. Your bed needs a solid and stable foundation
A mattress needs to be placed on a solid foundation. This can be the a divan bed, ottoman bed or bed frame with sprung or solid slats.
Putting a mattress on top of another one won’t make for a very solid foundation. Avoid stacking mattresses by placing them directly on the floor instead. At the very least, that would provide a stable basis.
Tip: Check out our guide on how to soften a firm mattress.
3. The top mattress will shift and slide
A mattress placed on another mattress may move or slip for no apparent reason. Mattresses will start to shift with all the climbing on and off, or when you toss and turn in bed during the night.
Some mattresses have covers made from smooth and silky fabrics, which will aid with slipping between the layers.
The worst that may happen is that you’d have to do some daily adjusting to get the mattresses back to a level position.
4. Can cause discomfort and back pain
The quality of your sleep depends significantly on the shape, structure and materials used inside your mattress.
When you stack one mattress on top of another, it might change the shape and structure of the mattress, which can impact how well it supports your body weight. Because of this, users may experience back pain and discomfort when they wake up.
5. You may feel too hot due to poor air ventilation
Stacking two mattresses can block airflow, which might cause you to feel warmer during the night. Mattresses are designed to breathe, allowing heat and moisture to escape.
When you place one on top of another, the bottom mattress can trap heat, making the sleeping surface warmer than usual.
This can be uncomfortable, especially if you’re prone to overheating or live in a warmer climate.
6. The mattress’ guarantee will become void
If your mattress is new and still covered by a warranty, stacking two mattresses will most likely void the warranty.
Most mattress warranties, require the mattress to be supported on a proper foundation, with slats no more than 7cm apart, as recommended by the National Bed Federation (NBF).
Stacking one mattress on top of another doesn’t meet these guidelines and can lead to sagging or structural damage. If this occurs, the warranty won’t cover repairs or replacements.
So be sure to check your manufacturer’s warranty for more details.
What are some alternatives to stacking your mattresses?
If you’re not ready to throw away both of your mattresses, you can keep one that’s in better shape and use a mattress topper.
A mattress topper is usually 5-7cm deep and will add an additional layer of comfort. They have straps on all sides, so they will stay in place and won’t move or slip.
Check out the Fogarty mattress toppers, which are priced £66 – £105 depending on the model and size you want to buy.
They regulate body temperature very well, and add a layer of support and comfort when you lay down.
Another popular product is the Simba mattress topper. It has a layer of up to 2,500 micro pocket springs, plus Simbatex® foam comfort layers to keep you cool and comfortable.
It comes with 10 year guarantee and 200 night home trial, so you can test and sleep on it at home.
A new mattress is your best bet in the long run. Make sure you check out our guide on the best mattresses with free trial. They have 100 or up to 365 night trail, so you can sleep on them at home and make sure that they are comfortable.
