How to fix a sagging mattress with plywood?

How to fix a sagging mattress with plywood?


If you find yourself dealing with a sagging mattress, you may be wondering how to fix it. One solution that many people have found effective is using plywood to provide additional support. In this article, we will explore the steps and materials needed to fix a sagging mattress with plywood.

Why Does a Mattress Sag?

Before we delve into the solution, it’s important to understand why mattresses sag in the first place. Over time, the materials within a mattress can break down, leading to a loss of support. This can result in uncomfortable sleeping positions and back pain. Additionally, heavier individuals or those who frequently sit on the edge of the bed may experience sagging more quickly.

Materials Needed

To fix a sagging mattress with plywood, you will need the following materials:

1. Plywood: Choose a sturdy plywood sheet that is at least ½ inch thick. The size of the plywood will depend on the dimensions of your mattress.

2. Measuring tape: Use a measuring tape to determine the dimensions of your mattress accurately.

3. Saw: A saw will be needed to cut the plywood to the correct size.

4. Sandpaper: Sandpaper can be used to smooth out any rough edges on the plywood.

Steps to Fix a Sagging Mattress with Plywood

Now that you have gathered the necessary materials, follow these steps to fix your sagging mattress:

1. Measure your mattress: Use a measuring tape to determine the length and width of your mattress.

2. Purchase plywood: Based on the measurements, purchase a plywood sheet that matches the size of your mattress.

3. Prepare the plywood: If the edges of the plywood are rough, use sandpaper to smooth them out.

4. Place the plywood under the mattress: Lift the mattress and position the plywood sheet evenly underneath it. Ensure that the plywood covers the entire sagging area.

5. Test for comfort: Lie down on the mattress and assess if the sagging has been adequately addressed. If necessary, adjust the plywood’s position or consider adding additional support.


Fixing a sagging mattress with plywood can provide a cost-effective solution to improve your sleeping comfort. By following the steps outlined in this article and using the recommended materials, you can effectively address the issue of a sagging mattress and enjoy a more supportive sleep surface.


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