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Can You Put a Mattress on Top of Another Mattress?

No, It is generally not recommended to put a mattress on top of another mattress.

Is your mattress worn out, and you are tempted to add a new mattress on top of the old one? Although it may sound like a good idea, placing a new mattress on the other is not advisable. You will end up reducing its breathability and damage your mattress.

In this post, we will list out some reasons you should not stack mattresses together, and some other alternative way for option.

Table of Contents

Why You Shouldn't Put a New Mattress on Top of an Old One?

It Reduces Breathability

Mattresses are designed that air can flow freely through their layers to maintain structural integrity. 

When you put a new mattress on top of an old one, you restrict the airflow underneath. This, in return, makes the top mattress trap heat and moisture, which can be uncomfortable for people in tropical areas.

It Will Damage Your Mattresses

Stacking mattresses together will damage them in the long run. When mattresses are stacked together, you trigger their formation structure, thus making them unstable. The mattress at the bottom will have to bear more weight than it can handle. This pressure slowly damages the mattress beneath and will not last long.

The mattress on top also gets depressions, indentations, and dips. Also, the top mattress can develop bulges while the bottom can sag between the gaps.

It Voids Your Mattress Warranty

Most quality mattresses come with a warranty that allows users to return them if they are sagging or have defects. However, the warranty only works if the user follows all the recommended guidelines.

Most brand warranties include a list of things that can invalidate them. This includes using an unsupportive foundation and stacking up the mattress. To keep your warranty valid, ensure you follow the guidelines provided by the manufacturer.

It Will Move and Slip

When mattresses are stacked together, you interfere with their structural integrity. You make them wobble, especially when shifting positions or getting in or out of bed. Since the edges are not naturally flat, they cannot support another mattress and make it slip when sleeping.

Additionally, most mattress covers are made of soft, silky materials that increase the chances of sliding and moving against each other. When you put a mattress on top of the other, you must keep readjusting them. This can damage their internal springs and affect the structural integrity of your mattress.

In the worst instances, the mattresses can slide against each other when sleeping, and you might fall on the ground.

A Mattress Stack May Make Your Bed Too High

Stacking a mattress over the other significantly increases the height of the bedding. The increased height might make you uncomfortable, considering most bed frames are not designed to accommodate certain heights.

Moreover, a raised sleeping surface can affect how you get in and out of bed. Small children can get into accidents when getting out of bed. Also, people with mobility issues can find it hard to get out of bed.

Instead of stacking mattresses to raise the bed height, use other safer methods like bed risers.

It Can Aggravate Allergies

Some mattresses are made of hypoallergenic covers that reduce the formation of dust mites and other allergens. If you place the mattress on top of the other, moisture is trapped at the bottom.

When the moisture is trapped, it provides an optimal breeding ground for fungi, dust mites, and mattress mold. Mold and fungi release spores that can be hazardous to people with allergies.

Dust mites release waste into the air, triggering allergic reactions such as coughing and sneezing. You can prevent the formation of molds and fungi by airing your mattress regularly or using a mattress protector.


If you’re using memory foam mattresses, stacking them together increases the chances of overheating. Such mattresses retain body heat, and their molecules reconfigure under pressure.

When stacked together, additional mass alters with the aerated layers, and more heat is trapped. Doing this makes your bed hotter, and the excess heat can make you uncomfortable when sleeping.

Alternatives to Putting One Mattress on Top of Another

Since stacking mattresses has numerous disadvantages, you can use alternative methods to achieve a stronger foundation. Here are the best alternatives you can use.

Platform Bed

modern Platform Bed

Platform beds are the most popular type because they have a slatted design and a solid base. They eliminate the need for foundation and are more comfortable even when using a single mattress.

To enhance comfort, ensure you use a mattress that’s compatible with your bed. Check the bed frames if you still get uncomfortable even after using the right mattress. Replace shabby frames with new high-quality models for better support.

Box Spring

wood Box Spring

Box springs work best by supporting and elevating your mattress to a comfortable height. They also help improve airflow and absorb the impact of turning and tossing. They protect your mattress from wearing and tearing, thus increasing its lifespan.

Additionally, most box springs feature stylish spring covers that enhance the appearance of your bed.


Slatted Bed Frame

Slat beds are the best, especially if you are looking for a bed that provides optimal air circulation. They also add extra springiness to the mattress and comfortably support your body weight.

Slats are made of different materials, but the most common are metal and wooden. Both materials are durable, but ensure they are evenly distributed to protect the mattress from sinking.

Put the Mattress Directly on the Floor

You can put your mattress on the floor if you don’t have a bed. Although this is not the best option, it’s better than putting a mattress on top of the other. A flat surface gives the mattress a stable, solid support, and it won’t deform.

However, this alternative should only be used for a short period. Placing the mattress on the floor for a long time can encourage mold formation, fungi, and dust mites.


Stacking mattresses is a quick fix, but doing this has more disadvantages than benefits. If you want to be more comfortable, use better options like slats, box springs, and platform beds instead of stacking mattresses.

If your mattress is old, you can consider replacing it with a quality brand rather than sacrificing good sleep.

Author: Jessica

Jessica is a lover of both life and gardening. She loves to share his passion for both on social media. He often posts about his latest gardening projects, as well as tips and tricks for others who might be interested in starting their own gardens. She also frequently posts about the different aspects of his life that he enjoys, from spending time with friends and family to exploring new places.

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