6 Easy Steps To Fix A Sagging Mattress With Plywood

Plywood might be what you need to fix your sagging old mattress because it will provide direct support to the sagging spot.

After measuring the sagging area, cut plywood with one extra inch and fix it behind the sagging spot to raise the mattress and provide support.

It is easy to fix if you know how to go about it. But if you do not know, this article will teach you How To Fix A Sagging Mattress With Plywood and provide the best types of plywood to choose for your mattress.

Why do you need Plywood to Fix a Sagging Mattress?

Plywood is a great fix for a sagging mattress. Plywood is also a renewable resource, making it a sustainable repair choice.

With a little effort, you can install plywood sheets to support the mattress and provide extra support for your mattress.

Here are some reasons why plywood might be a good choice for fixing a sagging mattress:

  1. Plywood is a strong and durable material that can support a large weight, which is why it is a good option for fixing a sagging mattress.
  2. Plywood is inexpensive. You can buy plywood sheets in bulk and save money on the cost of repairs.
  3. Plywood is easy to work with, and you can easily cut the plywood sheets to the correct size and shape.
  4. Plywood is easy to install. You can attach the plywood sheets to the mattress using simple screws or nails.

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6 steps to fix a sagging mattress with plywood

If your mattress is starting to sag, you can try using plywood as support. Cut a piece of plywood the same size as your mattress and place it under the sagging area.

Plywood is a cheap and popular way to fix a sagging mattress and it’s simple and might work for you.

Here are six easy steps to fix a sagging mattress with plywood:

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1. Measure your mattress

Measure the width and height of your mattress and the base of your bed.

Use a carpenter’s level or other measuring tools to measure the sagging on your mattress. If the difference in thickness is 0.2 inches or more, plywood can help to fix it.

2. Calculate how many plywoods are required

To fix a sagging mattress, you will need to calculate the number of plywood sheets that will carry.

You need about two standard-sized plywood sheets for a California King size mattress.

3. Cut the plywood

Once you have the dimensions of your mattress, use a straight edge to draw a rectangle on the plywood that is the same size. Cut out the rectangle using a circular saw.

Cut the plywood to the same size as your mattress using a circular saw. Finally, attach the plywood to your bed frame by screwing it.

4. Make the holes in the plywood

The holes in the plywood will allow for better air circulation and help to protect the wood from rotting.

Make the holes in the plywood using a drill and a ruler. The distance between each hole should be 4 inches and drill on top of a rails system.

5. Put the plywood on top of bed slats

If you have a mattress that is sagging, you can try to fix it by putting plywood on top of the bed slats to add more support and stop it from sagging.

However, if your mattress is saggy, you may need to replace all your wooden slats with plywood.

6. Put the mattress on top of the plywood

1. Place the plywood on top of the sagging mattress and ensure it is level with both ends by measuring from one edge to another.

2. Mark where each side of the plywood touches the mattress.

3. Drill holes along those marks with a drill and 1/4 inch diameter bit to hold the screws securely in place when you put them through from the bottom

Make sure the plywood is sturdy and as stable as possible.

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The Best Types of Plywood to fix the Mattress Sagging

There are several different types of plywood that you can use to fix a mattress that is sagging. Some popular choices include:

1. Quarter-sawn plywood: You can cut quarter-sawn plywood into four equal panels and cut the middle to create two equal-sized panels. It is suitable for fixing a mattress that is only slightly sagging, as the panels are thin.

2. Half-sawn plywood: You can cut half-sawn plywood into two panels and cut the middle to create four equal-sized panels. It suits a significantly sagging mattress, as the panels are thicker and can be more challenging to fix.

3. Full-sawn plywood: You can cut full-sawn plywood into a single panel and cut down the middle to create two equal-sized panels. Full-sawn plywood is from multiple sheets of wood and it is a wood product that is more durable and less likely to crack or split.

When it comes time to replace your old mattress, you may wonder which plywood to use. Here are some recommendations:

  • LAMINET Deluxe Extra Thick Sagging Furniture Cushion
  • Curve-Max Mattress Sag Support
  • Under Mattress Support
  • SagsAway Under Mattress

If you are unsure what plywood grade to use, you can contact a plywood supplier or a lumberyard and ask for their advice.

Best Types of Plywood to fix the Mattress Sagging by Size

There are many plywood types to choose from when building a saggy mattress. The most common types are 2x4s, 2x6s, and 2x8s.

  • 2x4s are the simplest plywood type to use. They are cheap and easy to find but do not provide the best sagging resistance.
  • 2x6s are a good option for building a saggy mattress because they provide good sagging resistance and a slightly thicker thickness than 2x4s.
  • 2x8s are the best plywood type for building a saggy mattress because they have the best sagging resistance and a slightly thicker thickness than 2x6s.

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Benefits of Using Plywood To Fix Sagging Mattress

There are many benefits to using plywood to fix a sagging mattress.

  1. Plywood will help to reinforce the mattress, which should help to prevent it from sagging in the future.
  2. Using plywood will also help to keep the mattress cooler in summer and warmer in winter, which can be helpful if you have sensitive skin.
  3. Plywood will also help to protect your mattress from wear and tear.

Plywood vs. Other Sagging Mattress Fixes

Plywood is a practical and inexpensive fix for sagging mattresses. Depending on what you want, it can be cut to any length, width, or thickness.

Some people have found success with fixing a sagging mattress by adding plywood. However, plywood is not the only option when fixing a sagging mattress. Mattress toppers are also helpful in fixing sagging mattresses.

Mattress Toppers and Pillows vs. Plywood

Toppers are thin material placed on top of a mattress to make it more comfortable. They come in different materials, including memory foam and microfibre.

The Emma flip topper is one of the best mattress toppers on the market for sinking mattresses. This topper is 100% high-quality cotton and features a soft fabric for ultimate comfort.

Pillows are a popular and sustainable way to fix a sagging mattress, and plywood is also an option but not a popular choice. Regardless of the material you choose, adding extra support to your mattress can make all the difference.


How does plywood on box spring make mattress firm?

A box spring platform is a wood or metal that supports the mattress, so the plywood or metal board under the mattress can prevent sagging.

Where do you get a plywood mattress support board?

There are many places like lumber yards, home improvement stores, and furniture shops to get plywood mattress support boards, and it is the perfect solution for beds without adequate support.

How thick should plywood be under a mattress?

The thickness depends on how dip the mattress sinks. If the mattress is sagging more than an inch, you will need a thicker piece of plywood to provide adequate support.

What kind of plywood do you use under a mattress?

The best choice is 3/8 inch thick plywood, which is both thin enough and strong enough to support the weight of your mattress.

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