How to Fix a Saggy Mattress with Plywood?

About one-third of our entire 24 hours in a day is spent in bed. Therefore, it is important to get the best of these hours. This might prove impossible if your mattress is sagging. Sagging is known to cause backaches, stiff spine and several other health problems.

You wonder if that means the end of your mattress once it starts sagging. Considering how expensive good mattresses can be, you want to seek other alternatives. There are simple solutions to this problem. The use of plywood is one of them.

To fix your mattress with plywood, ensure your bed is the type that can be fixed with plywood. Measure the depth of the sinking and cut the plywood to size. You can then place the cut plywood under the area that is sinking.

Picture of How to Fix a Saggy Mattress with Plywood


Let us take a step by step walk through the process of fixing your mattress with plywood.

Step by Step on Fixing a Saggy Mattress with Plywood

The process of fixing your mattress with plywood is quite simple. You can actually do it yourself if you have a strong arm. You might need assistance lifting your mattress though if it is a heavy one.

This is the short procedure on ensuring you have a great sleep;

  • Mattress Type: You need to determine if the type of mattress you are using can be fixed by using plywood. Not every type of mattress can be fixed with plywood. If you make use of innerspring, waterbed or air mattresses, you might just have to get a new one.
  • Measure Depth: You need to know the depth of the sinking. You could feel around it, noting areas that are softer than others. One easy way is to get a yardstick and tape measure. Place the yardstick vertically on the bed and measure using the tape, the level of the sinking of the mattress from the yardstick.
  • Cut the plywood: You should then cut the plywood to the size of the sagging area. You can also use plywood to support the entire weight of your mattress. You just have to cut the plywood to the size of your mattress. Depending on the size of your mattress and the plywood, you might have to join two to cover the entire mattress area.
  • Put the Plywood in the Spring Box: Place the cut plywood in the spring box of your mattress. If you do not use a spring box, you can place the plywood under your bed frame. Make sure you cut the plywood within one inch of your mattress width in the case. This will prevent the plywood from sticking out from under the mattress.

Plywood might also make your bed firmer than you are used to. It also cuts off air circulation to the bottom of the bed which might lead to the presence of mildew.

Note that using plywood is only a temporary measure. You might still have to replace the mattress eventually. You could be wondering as to the cause of sagging.

Why is My Mattress Sagging?

It is said that knowing the problem or the cause of the problem is half the solution. I think it is also true concerning mattresses. There are a few reasons why your mattress might be sagging other than a long period of use.

There are some mattresses in the market that are of poor quality. This cause sagging quite early in the use of the mattress. Some manufacturers also unscrupulously use bad materials in their production.

If the spring box of your mattress is broken or it is no longer as firm as it should be, your mattress tends to sag in those areas. If you start to experience sagging in a relatively new mattress, you can check your spring box for weak spots.

You can have your small children walk on it and tell you the areas that sink. It is quite easier and cheaper to replace a spring box. If you continue to use the spring box in that condition, you invite sleep troubles. You can also lose your mattress to poor maintenance.

If you do not talk proper care of your mattress, you might come to find that the mattress might not use up to a quarter of its lifespan. You can prevent sagging by regularly rotating your bed or flipping it. It is also advised that you do not sleep on only one side of the mattress.

Are There Other Alternatives to Plywood?

There are other alternatives to the use of plywood. You might have come to the conclusion that the depth of the sagging of your mattress is not serious enough to require plywood.

If your mattress is a memory foam mattress or a pillow top mattress, I have a few suggestions for you. You can first try rotating your bed 180 degrees. This changes the area you sleep on often and reduce pressure on those areas.

Sleep experts also advise that you rotate or flip your bed at least once in a month or two. If you use a two-sided mattress, you just have to flip the bottom up. You could also get a memory foam topper if your mattress is made of memory foam.

These toppers are cheap and they do not change the feel of your mattress.  For pillow-top mattress users, if rotating does not work for you, you can add a one-inch wooden board to your mattress for better support.

When Should I Get a New Mattress?

You should definitely get a new mattress if;

  • You have been using your mattress for 10 years or more.
  • If the sagging is up to 1.5 inches or more.
  • Your mattress springs are coming out and the sewing is coming loose.