How To Fix A Sagging Mattress With Plywood

Learning how to fix a sagging mattress with plywood is relatively straightforward because you’ll just place it on your bed frame. You’re probably familiar with this method as a solution for indentations, but it’s also applicable if your mattress again turned saggy. This article will discuss why plywood works and how to use it correctly.

Furthermore, you must understand that this fix also has drawbacks. There are even some considerations to remember when fixing a sagging mattress this way. So without further ado, here is the complete overall guide for improving a sagging mattress with plywood. 

How To Fix A Sagging Mattress With Plywood


How To Fix Sagging Mattress With Plywood


How plywood helps with a sagging mattress

There are many ways to fix a sagging mattress, but using plywood is perhaps the most straightforward method. If you think about it, one of the reasons why a mattress sag is it has poor support on the bed frame. By placing a sheet of plywood on the slats, you’re enforcing the bed frame structure and keeping the mattress from sinking further. 

The additional structure beneath the mattress is a temporary solution but a quick fix. You just want to use plywood with the same size and shape as the sagging part of the mattress to restore it. The plywood will push this part up to help the mattress feel firmer and more supportive. 


What to consider when using plywood to fix a sagging mattress

As mentioned previously, laying plywood on the bed frame only works as a quick fix. This shouldn’t be your permanent solution, especially if the dent on the mattress is deep. However, it should help you avoid body pain due to the uneven surface of a sagging mattress. 

Are there any issues you might encounter when using plywood under a mattress? You can assume that due to it being wood, plywood is not breathable and can affect the mattress’s circulation. You have to be mindful of moisture and humidity because of the risk of mildew.


What Kind Of Plywood Do You Use Under A Mattress?

You may assume that you can just use any type of plywood to fix your sagging mattress. But much like the mattress topper that you place over the mattress, the plywood underneath your mattress should also have the right characteristics for it to work. For starters, how thick should your plywood be?



Perhaps the plywood’s most significant trait is its thickness when it comes to supporting a sagging mattress. Use something around ¾ inches thick to ensure that the plywood will help you achieve the firm support you lost with a sagging mattress. The next consideration will be what specific type of plywood you should get. 



You can use any regular plywood as long as it’s durable enough to support your body weight. Some good options are AB and BC softwood plywood with a smooth surface and rounded edges. This way, they will last for daily use, but they won’t accidentally damage the mattress due to splinters. 



You can have the plywood corners rounded and ask for the surface sanded fine and sealed with varnish. Ideally, you should even add batting and upholstery fabric to the plywood. With these modifications, you should be confident that the plywood will last long and won’t tear your mattress.


Can You Use A Piece Of Plywood Instead Of A Box Spring?

You can use a plywood piece instead of a box spring if your foundation for the mattress is thick enough to keep it well-supported. Remember that a box spring’s purpose is to help distribute the pressure on the mattress. You can’t lose this support, or you’ll risk popping a spring on your mattress, so use plywood to do the box spring’s job. 

If your mattress doesn’t have springs, you still want to use plywood over the slats. The central concept is to help the pressure on the mattress distribute to prevent sagging or dents. They don’t only happen while you’re lying in bed, but the mattress will also benefit from plywood or box spring when you get on and off the bed. 


How To Fix A Sagging Mattress Permanently

A more permanent solution for a sagging mattress is to get a new mattress or bed frame. Check if your mattress has passed its intended lifespan and get a new one to ensure that you’ll get the best sleeping posture. You can also opt to get the recommended bed frame by your mattress’s manufacturer so that it’s well-supported and won’t sink with daily use. 



If you can’t get a new mattress yet, you want to solve the issues in terms of comfort in the meantime. For example, you might benefit if you know how to fix a sagging mattress with plywood because it works as a quick solution. The plywood will lift the sagging part up to restore its firmness and support by putting it under the mattress. 

To get the most of this solution, please select the right size and thickness of plywood to do the job. It should also be smooth with rounded corners, so you won’t end up damaging the mattress. In some cases, you can even replace box springs with plywood!