How to Fix a Sagging Mattress with Plywood?

A comfortable mattress is a key to good night sleep, consequently a key to the quality of your day.

However, a mattress that is too soft for your liking is downright uncomfortable.

A saggy mattress, in particular, is not only uncomfortable but may result in aches, pains and a less-than-restful night.

The horrible indentations on a saggy mattress will always leave you and your partner with back pains and poor sleep, because you are sleeping in a “hole.” This is not to mention the depression you feel having spent all that money, and then finding out it feels like nothing it did in the store.

Sagging Mattress

There are various reasons why mattress sag. Contrary to what many people believe, it not only old mattresses that sag but new mattresses sag as well.

Insufficient support from beneath is a primary reason why most mattresses sag. If you do not employ sufficient support such as a box spring, it may lead to the breakdown of your mattress internal support structures, consequently sagging from its weight.

Age is the second reason why most mattresses sag. With time, your weight exerts pressure on the interior of the mattress, and this weakens the material, leading to soft spots and sagging.

In most cases, having a saggy mattress feel like you are sleeping in a bed hammock, and rolling towards the center. This is particularly evident when you have a partner with you.

Given that new bed runs into hundreds and thousands of dollars, getting a new one is not always in the cards for many.

The only option left is to firm the sagging mattress.

How To Fix A Memory Foam Mattress

There are various ways to firm a saggy mattress, but today, we shall be looking at how to fix a sagging mattress using plywood.

How to Fix a Sagging Mattress with Plywood

But before then we suggest that you first try to rotate your bed 180 degrees or flip it upside down. This might help as it will allow your body to apply pressure in different areas. At times, it can even out the foam by redistributing the weight.

If that doesn’t work, you will need to use plywood.

How To Fix A Memory Foam Mattress Using Plywood

1) Buy your Wood

The first step is to visit your local home improvement store and purchase a piece of plywood.

While at it, ensure the wood is wide enough to cover the sagging area and long enough to cover the stretch from the top to the bottom of your bed. 

While most of the store will custom-cut the wood depending on your needs, you can do it home if you have a saw.

Always keep in mind that plywood can be rough and therefore you may want to sand the plywood before use to avoid some inconveniences.

2) Fix the Mattress Type

To repair a sagging mattress, you must fix the mattress type. While plywood works in most beds, it does not work in some models.

Therefore, it’s crucial you ensure your mattress is repairable with plywood. 

You cannot fix sagging with plywood on innerspring, waterbed, and air mattresses.

3) Place the Plywood in the Spring

Remove the mattress from the bed until you have the base or slats exposed.

After this, carefully place the plywood on top of the bed, covering the area where the mattress sag would be.

While at it, it’s essential that you measure where the sagging starts and starts and this will help in positioning the plywood correctly.

Once the plywood is lying down, place the mattress on top of it as you would do on a bed frame.

Hopefully, with the plywood on, you should feel a noticeable difference.

Fixing your Mattress with Plywood Due to Frequent Use

If the sagging on your mattress is as a result of frequent use, understand that plywood will only offer a temporary solution and it won’t fix the issue completely, but it should help at least.

Also, Read – How to Clean a Memory Foam Mattress

Temporarily, placing the plywood under the bed should help. Here, you will need to spread the plywood on the soft spot of your mattress. 

The addition of plywood will increase the thickness of your mattress, and this will help to remove the sagging.

Drawbacks of Using Plywood

Resting your mattress against a flat wood surface means that less air will circulate your bed. With less air circulation, it can trigger the development of mildew growth on the bottom of your mattress. This is particularly true to those living in humid conditions.

The good news is you can prevent this by turning your bed periodically to allow for more air circulation.


Plywood is just but a temporary solution, and as time goes on, the wood will not be enough to make your mattress comfortable. 

In any case, consider plywood as a short-term solution for fixing a sagging mattress while you search for a long term fix such as purchasing a new mattress.

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