How To Fix A Sagging Mattress With Plywood

How To Fix A Sagging Mattress With Plywood

A sagging mattress is usually an old mattress. A bed typically have no age limit that how long it will keep its durability, and because of this, the mattress will likely sag in some point of time.  Because of old age, a sagging mattress tends to submerge mostly in centre parts. Because of this, trouble like sleeping discomfort, headache, back pain arises.

A quality mattress is costly, and not everyone have can afford another new mattress straightway. Plywood can give us a very effective solution for this. Using plywood mattress can be fixed quickly, and it will expand the mattress longevity further.

Reasons for the mattress to sag

Several reasons can be mentioned as the cause of a sagging mattress. Most of them are significant reasons and are described below.

Time: People tend to use the mattress for a long time, and the amount of time is the primary reason for a bed to sag. The strength of a new mattress reduces over time, and it is unavoidable. Even a lot of precautionary measures failed in the past, which convinced us enough to take another approach like delay sagging of the mattress. Usually, after five years, a bed starts losing its toughness, and after ten years, it becomes worse in most scenarios. So the ideal time to replace the mattress or fix mattress sagging between 8-10 years.

Poor quality: Like so many manufacturers in the market, some of the mattresses likely possess poor quality or defects. They cheap to purchase, and a lot of people get them just because of the price. Eventually, in about 2-3 years, it will start sagging.  An expensive mattress usually made of quality materials which resist sagging and sinking. Best way to find the right quality mattress is to check customer reviews and their user experience on websites.  

Old or damaged box spring: This is one of the main reason, and it is often overseen. In most common phenomenon a particular area of box spring is broken which causes sagging or extends sagging.  Even though it does not cost much, but people don't give it importance and leave it broken. The resilience of mattress mainly relies on this box. So it is necessary to check the condition of spring box frequently.

Poor maintenance: Another significant cause of mattress sagging is low maintenance. People often do not fix mattress sinks or holes which causes further sagging. Even the outerwear of mattress needs frequent checking. Sagging usually occurs in a  particular spot of mattress mainly due to lack to rotation. Any expensive mattress will start sagging without frequent maintenance and rotation.

Sleeping regularly in a particular area

People have a habit to sleep in the same area of bed frequently, and this is another reason for sagging. Sleeping in the same area deteriorates the layer of that area which eventually sagged.

The old mattress will be certainly sagged due to this reason. This trouble can be delayed by rotating sleeping position.

Fragile Bedframe: Another common reason is the fragile bed frame. A lot of the time, the low-quality bed frame is responsible for mattress sagging. Usually, the metallic bed frame is more prone to have mattress sagging than a wood bed frame.

 People should give a similar emphasis on the bed frame as the give on the mattress. Also, bed furniture  should be replaced first before changing the mattress in case of sagging.

How to fix a sagging mattress with plywood

Mattress sagging can be fixed with lots of other methods but the best way to fix it with plywood.

To do this, a layer of plywood compatible with beds measurement is needed. 2 pieces of plywood may be needed according to the size and condition of the mattress.

Step 1-

Even though plywood can fix most mattresses, but some types of mattresses cannot be fixed using plywood. So first, it's crucial to determine the mattress type and find out whether plywood can fix it or not. Three types of mattresses named an innerspring, waterbed and an air mattress is not repairable using plywood

Step 2-

 the depth of the sags needed to be calculated using ribbon. After getting idea thickness which will reverse the sagging, we need to get plywood according to the intensity of the sag.

Step 3 –

Cut the plywood according to the measurement which is taken earlier. Using a saw cut the plywood. The plywood dimension has to be 1 inch smaller than the dimension of bed and mattress. After that, plywood needs to be positioned between box spring and mattress. If the sagging because of the supporting system, plywood will give strong support. In terms of Slate base bed, put the plywood the slats and position the mattress on top. This way the mattress will get force from underneath, and that will stop further sagging.

  Other ideas –

Often, sagging happened because of numerous use and in such scenario plywood is only a momentary solution.

In those cases, take a plywood piece with similar measurement and position it below the mattress in the soft areas. This will keep the mattress up and keep away from troubled areas.


Even though using plywood is a great way to solve the sagging issue, there are some other disadvantages of it. The main trouble is the lack of air circulation under the mattress. If the area has a lot of humidity, then there is likely chance that mildew will grow on plywood. After using long time, mildew will make the mattress soft.

Other tips 

Adding a mattress pad on top of your bed will reduce the negative effects of plywood. The plywood needs to be checked frequently for mould and mildew. Even though plywood efficiently fixes sagging mattress, this is only a temporary resolution. After a certain period, the mattress has to be replaced.


Because of many health issues, people need to fix their mattress, and plywood can become an excellent solution for it. Using is appropriate will significantly reduce the number of sleepless nights and gives more comfortable relaxation.                                                                            

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