How Do You Fix a Sagging Mattress?

Given that we do not take purchasing of a new mattress lightly, and that we are ready to invest in a good sleeping surface, we tend to believe they will remain new and in perfect condition for a long time, preferably forever. But that’s not going to happen. We are using our mattresses all the time, and it is expected they will become worn out at some point. This will probably manifest in sagging spots, and you will most likely start experiencing some kind of discomfort when you wake up in the morning.

Although you probably won’t notice this at first, you will start feeling less comfortable, like you cannot find a perfect position to sleep in, and later on, when the sagging progresses, there can be hip or back pain present. At this point, you should check out if there are any recesses in the middle of your bed, and if the answer is yes, we will explain to you how to fix a sagging mattress.

Why Do Mattresses Sag? 

Sagging of a mattress isn’t something that should surprise you. Every sleeping surface, no matter if it’s made of foam, coils, if it’s a hybrid model or latex type, or how firm it is, will become softer overtime. That phenomenon reflected in the appearance of some dents and valleys is a result of prolonged use of the sleeping surface, and it can make you feel very uncomfortable.

You probably noticed that sagging happens in those areas that are most affected by your weight, like the middle of the mattress where hips are placed, or that upper region for shoulders and chests. The first thing that occurs is that comfort material deteriorates, and then those layers under the cover start reshaping and creating unnatural forms. Now, it sounds crazy, but this can be a good option for side sleepers because it can create a cushiony feel in places where their prominent body parts go and help align their spine. But, if the sagging continues, then the effect will be quite the opposite.

Also, couples who have a habit of sleeping close to each other, or spooning, more precisely, will for sure experience this mattress deviation, given that there will be huge constant pressure on the middle of the sleeping surface where sagging usually starts.

How Does Sagging Affect your Sleep?

You need to fix a sagging mattress because the fact your sleeping surface is reshaped can lead to a couple of different problems. First of all, you can and will experience some kind of pain and pressure. The fact that because of this, your spine will not be well aligned will cause you to feel an ache in the back, head, neck, and hip areas. Simply, you won’t have the right support anymore. 

The other problem you may meet is hot sleeping. If you own an innerspring mattress, and you notice there are some sagging spots, you should also expect to start feeling a bit warmer during the night. That’s because the coil system is probably disrupted and damaged by these dents in the mattress, so the airflow is restricted.

back pain

Your bed can also become more squeaky, as it turns out. Affected by the extensive weight in the places that are weakened and recessed, your bed will be quite loud. That is the experience of those with innerspring and hybrid sleeping surfaces. Memory foam mattress and latex versions most likely won’t have this problem since they are fundamentally quite quiet. 

And the last thing sagging mattress will affect is your sex life. Couples reported that this kind of deterioration very much affects the process of lovemaking, given that uneven surface very often leads to some uncomfortable and awkward situations in bed.

How to Fix a Sagging Mattress – Step by Step

We all know how mattresses can be expensive, and you probably want to try everything you can in order to save it and delay the new purchase. We suggest you stay with us and see how to fix a sagging bed in a DIY manner.

Rotate the mattress regularly

From the moment you buy a new mattress, you should start applying this rule in the same dynamics, you shouldn’t wait for the sagging to happen. This means that you should turn your mattress 180 degrees so that the place where you put your head on ends up at the spot where you place your feet. That way, you will help this product to preserve its original shape as long as possible. Experts from the mattress industry suggest you do this every six months, but do not turn the mattress on its other side unless you are certain it has flippable design. Mattresses are created with a specific structure, and they are not meant to be used both sides.

flip the mattress

Use a mattress topper

In case there is already a sagged area on your mattress, you can purchase a mattress topper and try fixing this problem the easy way. It is a bed layer you can buy separately and place it on top of your mattress in order to adjust its firmness. If you have sagging places, you should use a thicker topper because it will be able to create an effect of sleeping on an even surface again, it will fill the sag gaps. They can be great for your back, and you can choose between memory foam, latex, wool, convoluted polyfoam, and feathers filling. 

Purchase new foundation

You may be surprised by this one, but it turns out that foundations can cause sagging of the mattress. The reason often lies in an insufficient number of legs the construction is supported by, especially in cases when you are using a huge king mattress or queen sleeping surfaces. You will see that most warranties say you need to have an adequate foundation, with at least six legs, and that’s for a reason. If there is a huge gap between the legs of a bed base, the mattress will easily create a recess in the central area because of the weight of a sleeper, faster than if you didn’t use foundation. And don’t forget that bed foundations can deteriorate over time, just like the mattresses, so you will need to replace them at some point. 

Add support with plywood

Add support with plywoodIf you are looking for a cheap and easy fix, here is a suggestion – you can put a piece of plywood under your mattress in order to get more support and reduce the consequences of sagging. It would be best to cut the plywood, so it’s one inch shorter than a foundation and put it on top of the platted base. If it’s positioned correctly, it will help you feel more comfortable for sure. But there is one shortcoming regarding this solution – the plywood can minimize the airflow and cause you to experience the incensement of mattress temperature during the night. This definitely isn’t a permanent fix, it’s just the temporary one until you figure out how to buy a new mattress.

Use a pillow to support sagging spots

In case you don’t have the money right now to buy a mattress topper or a new foundation, and the trick with plywood isn’t working, you can try another simple fix with pillows. Check where are those sagged spots on your mattress, and then place pillows on top of them and cover everything with a sheet. There is a chance you will be able to feel more comfortable, but it is important what type of pillows you use for this too. It would be best to pick those with excellent shape retention, such as latex or memory foam models. This is not an unusual thing, many people tend to use pillows and place them between their knees, under their back or stomach, to align their spine.

File a warranty claim

If none of these solutions don’t do the work, you should definitely file a warranty claim. Read the manufacturer’s notes carefully and do everything they ask you to. Then contact them, initiate the claim, and continue as directed. There are no guarantees they will accept it, it depends on many factors and how you maintained and used your mattress, but there is always a chance.

How to Fix a Memory Foam Mattress

Since a considerable number of people, probably the majority, own sleeping surface made out of memory foam that’s particularly sensitive when it comes to this problem, here is what you can do if you notice some sagging spots. We are bringing a few options on how to fix a sagging memory foam mattress. First, you need to rotate it as we already suggested and see if you can flip it on the other side. This step will be helpful because your body will start applying pressure in different areas, so the foam can be distributed evenly again after some time. The second step is putting a thick mattress topper on top of it, so you can still feel the same when you lie down in bed at night. If you don’t manage to sleep well after that too, then it’s probably time to buy a new mattress, since this one is probably too damaged.

how to fix sagging mattress

How To Fix A Pillow-Top Mattress

If you own a pillow-top mattress, you probably know that it usually isn’t made as a flippable product, so you won’t have this option. In case you notice sagging areas, you should rotate it more often than usual, and try finding the right spot for nights rest. The hope is that your weight will be redistributed and that it will help to flatten out your top mattress layer.

If this doesn’t work, you can try with a wooden board. Take a thin, one-inch thick piece of wood board, and place it under your mattress, specifically under those problematic areas, and on top of your foundation or box spring. That way, you will get the additional layer of support, which should resolve this problem for some time. You will probably feel like the ground you are sleeping on is significantly firmer, but your spine and your whole body will be aligned again.

Besides that, you should see if your foundation is in good shape or if there is some kind of a problem with it, for example, if there’s any broken or weakened spot. If that’s the case, then it is certain that the damaged foundation cannot support the mattress properly, which leads to the sagging almost for sure.

Sagging and Mattress Warranty Considerations

You should bear in mind that sagging is the most common mattress defect, but depending on its depth, manufacturers will or will not accept your claims. Usually, the dent caused by sagging needs to be one inch or deeper in order to be recognized as a failure that falls under warranty. If the sagging is lower than that, it’s considered to be normal as a result of classic wear and tear. 

You should know that most warranties have a list of specific guidelines you need to follow regarding the foundation support, the number of legs it needs to have, materials you can use, the distance between slats, etc. If you don’t stick to those, you probably will have a damaged mattress that will void the warranty in most cases.

Also, don’t forget that mattresses that have a 10-year warranty are not entirely prorated. They are usually partially prorated, with only two or three years of coverage. So you need to check the warranty schedule before you make a claim in order to calculate if the replacement of the mattress will be too pricey. 

get a new mattress

Signs It’s Time To Get A New Mattress

Every mattress has a certain lifespan, after which you should replace it. No matter how careful you are, and if you apply all the tips that will prolong their good condition, there will be a point when you have to say goodbye to your sleeping surface. All those steps we listed above are only temporary solutions that can only prolong the moment for a new purchase. So how to know when is the best time to buy a mattress?

If, for example, you have a 15-year-old mattress you don’t have to check any criteria, you can be absolutely sure it is time for a new one. Also, if you are constantly trying to find the best possible position to sleep in, but you just cannot succeed, that’s another sign you should start looking at what’s on the mattress market. Old and sagged sleeping surfaces will cause you back, neck, and head pain quite often. That’s because their surface is all disturbed by light bumps and recesses that are preventing your body from staying aligned. 

Experts say that changes in your life like having a partner you share your bed with is another moment when you should consider buying a brand new mattress. That’s because the way you slept before certainly created some reshaping of the sleeping surface, so you won’t be comfortable enough when there is another person right beside you. 


Even the best mattresses on the market will come to their end, that’s for sure. And if you are stubborn and refuse to replace your mattress, you will undoubtedly experience consequences that will take away your good night’s sleep. You can experience insomnia, sleep apnea, and extensive pain in numerous parts of your body. We all need to remember that we spent a lot of time in our bed, approximately one-third of our life. And the low quality of sleep can, in time, affect our health in more than one way. So don’t take this lightly. It’s understandable that you cannot afford to buy a new mattress the minute it shows some defects, and that’s why we listed all the things you can do to postpone that purchase. But none of them are permanent solutions, don’t forget that.