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How to Fix a Sagging Mattress With Plywood?

A sagging mattress can disrupt your sleep quality and negatively impact your overall well-being. But fear not, because there’s a simple yet effective solution: using plywood to fix a sagging mattress.

In this post, we’ll walk you through the process of restoring your mattress’s support, enhancing its comfort, and ultimately reclaiming your peaceful slumber.

Table of Contents

Benefits of Using Plywood for Mattress Support

plywood for mattress

Using plywood to fix a sagging mattress offers several advantages that can transform your sleep experience. Here’s why this simple solution is worth considering:

  • Cost-Effective: Purchasing a new mattress can be a significant expense. Plywood provides an affordable way to enhance your mattress’s support and extend its lifespan.
  • Customizable Support: By choosing the thickness and type of plywood, you can customize the level of support you need for your mattress.
  • Even Support: Plywood ensures uniform support across the entire mattress surface, eliminating sagging areas and promoting better spinal alignment.
  • Improved Comfort: A firmer mattress surface can alleviate pressure points, contributing to a more comfortable and restful sleep.
  • Easy Implementation: The process of adding plywood to your mattress is straightforward and doesn’t require specialized tools or skills.

How to Fix a Sagging Mattress With Plywood?

Sagging mattresses can lead to restless nights and discomfort. Fortunately, rejuvenating your mattress using plywood is an affordable and straightforward solution. Here’s a step-by-step guide to help you achieve a revitalized sleeping surface:

1. Choosing the Right Plywood


It’s crucial to choose the right type of plywood. You can opt for plywood that is smooth, splinter-free, and of appropriate thickness. A ½-inch thick plywood sheet is generally recommended for most situations. 

Meanwhile, you should make sure to select plywood with minimal voids or imperfections to ensure optimal support.

2. Measuring and Cutting the Plywood

In the start, you need to measure the dimensions of your mattress accurately. You want the plywood to fit snugly beneath the mattress without overhang. 

Once measured, you need to carefully cut the plywood to match the mattress size. A circular saw or jigsaw works well for this task. Remember, precision is key to achieving the best results.

3. Preparing the Mattress and Bed Frame

Before placing the plywood, you can remove all bedding and clean both the mattress and the bed frame. A clean and level surface can ensure that the plywood sits evenly beneath the mattress.

4. Placing the Plywood Under the Mattress

Position the cut plywood on the bed frame and ensure it aligns correctly with the edges of the mattress. This provides consistent support across the entire sleeping surface. 

In this process, you should take your time to make adjustments as needed to achieve the desired fit.

5. Securing the Plywood in Place


There are various methods for securing the plywood in place. You can use strong adhesive tape, straps, or grippers designed for this purpose.

You can choose a method that suits your preferences and ensures that the plywood remains stable throughout the night.

6. Testing and Adjusting

After placing the plywood, you should test the mattress by lying down on it. Assess the level of comfort and support it provides. If needed, you can make slight adjustments to the positioning of the plywood.

In order to continue to provide desired results, you need to check the plywood’s placement regularly.

When to Consider a New Mattress?

Although plywood can be a great solution, there comes a point where replacing the mattress is a better choice.

If your mattress shows signs of severe wear, has broken springs, or is over a decade old, it might be time to invest in a new one. You should prioritize your sleep quality and well-being above all else.


Will using plywood make my mattress feel too firm?

While plywood does provide added support, its impact on mattress firmness can be adjusted by choosing the right plywood thickness. You can make experiment with different thicknesses to find your desired comfort level.

Is plywood suitable for all types of mattresses?

Plywood can work well for most mattress types, but it’s important to adapt the thickness and size of the plywood to suit your specific mattress.

Will adding plywood void my mattress warranty?

It’s essential to check your mattress warranty terms. Some manufacturers might consider the use of plywood as a modification that could void the warranty.

Can I use multiple layers of plywood for extra support?

Yes, you can use multiple layers of plywood for extra support. Adding layers of plywood can increase the overall strength and stability of a structure. 

How often should I check and replace the plywood?

You can check the plywood periodically for any signs of wear or damage. If it needed to maintain consistent support, then replace it.

Can I use plywood to fix sagging on both sides of a double-sided mattress?

No, using plywood to fix sagging on both sides of a double-sided mattress might not be the best solution. Plywood can provide temporary support, but it won’t address the underlying issue causing the sagging.

How long does this plywood fix typically last?

With proper care, the plywood should provide effective support for several years. Regularly checking and adjusting its position can prolong its lifespan.

Are there any risks or potential downsides to using plywood?

When using plywood of appropriate quality and thickness, the risks are minimal. You should avoid using plywood with sharp edges or splinters.

Can I apply this method to a memory foam mattress?

No, using plywood to fix sagging in a memory foam mattress is not recommended. Memory foam mattresses require a supportive and even surface to properly contour and support the body. 

Adding plywood may alter the original intended support and negatively affect the performance and comfort of the mattress. 


Don’t let a sagging mattress steal your sleep quality and comfort. With the simple solution of using plywood, you can revitalize your mattress and enjoy a supportive sleeping surface once again.

By understanding the process, choosing the right materials, and following the steps, you can fix a sagging mattress with ease.

Author: Jessica

Jessica is a lover of both life and gardening. She loves to share his passion for both on social media. He often posts about his latest gardening projects, as well as tips and tricks for others who might be interested in starting their own gardens. She also frequently posts about the different aspects of his life that he enjoys, from spending time with friends and family to exploring new places.

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