How Can I Fix A Dip In A Mattress?

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Discover how to effectively fix your mattress's sinking problem and ensure a comfortable, restorative night's sleep every night. Whether it's a memory foam, hybrid or gel memory foam mattress, we offer expert guidance and practical tips to help you tackle mattress sagging and enjoy a healthy night's sleep.

Over time, whether it's a memory foam mattress, a hybrid mattress, a gel memory foam mattress or even one of those convenient mattress in a box products, sinking can occur. The problem. Choosing a firm mattress that fits your sleeping position may help extend the life of your mattress and improve the quality of your sleep. In this article, we'll explain how to repair mattress indentations to help restore comfort and support to your mattress.

1. Repairability of mattress dents

Mattress dents are more than just an aesthetic issue; they are directly related to the quality of your sleep. Understanding the common causes of mattress dents is the first step in solving the problem. Usually, mattress dents are caused by compression of materials, prolonged exposure to heavy pressure, or insufficient support from the bed frame. In the case of memory foam mattresses, hybrid mattresses, or gel memory foam mattresses, their material properties dictate that a certain amount of indentation is normal, but excessive indentation requires measures to repair.

Next, let's explore the commonness and acceptance of mattress sagging and how it affects our sleep.

2. Mattress Sagging Common and Acceptable

It's normal for mattresses to sag slightly in the early stages of use, especially for memory foam mattresses and gel memory foam mattresses. They adjust to the contours of your body to provide personalised support. However, when mattress sagging affects the quality of your sleep, such as by causing back pain or interrupted sleep, it's time to take action.

Understanding the normal extent of mattress sagging is critical to maintaining your mattress. A good rule to follow is that if a mattress sinks more than 1.5 inches (about 3.8 cm), it may be time to consider repairing or replacing the mattress. For those looking for firmer support, choosing a firm mattress or choosing the right mattress for your sleeping position can be effective in reducing sagging problems.

Next, we'll detail how to fix the collapsed side of your mattress to ensure you enjoy an even and comfortable sleep environment.

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3. How to fix a sagging side of the mattress

A collapsed side of your mattress not only affects the quality of your sleep, but can also lead to long-term discomfort. Fortunately, there are several ways to help fix this problem:

  • Rotate and flip the mattress regularly: for mattresses that are not used on one side, rotating or flipping the mattress every three to six months can help even out wear and reduce the amount of sinking.
  • Use a mattress topper: A high-quality mattress topper can help balance the surface of the mattress by providing extra support on the sunken side.
  • Adjust your sleeping position: Try changing your sleeping position to spread out the pressure on your body and avoid sleeping in the same position on the mattress for long periods of time.

If you have a memory foam mattress, hybrid mattress or gel memory foam mattress, the adaptive characteristics of these materials make them more prone to collapse. In such cases, regular maintenance and appropriate repair measures are particularly important.

Now, let's explore whether plywood underneath the mattress is a viable solution and how it can help with mattress sagging.

4. Should I put plywood under my mattress?

Plywood underneath the mattress is a common solution to mattress sagging, especially if the sagging is caused by inadequate support from the bed frame. Plywood provides a firm, flat support surface that helps distribute body weight and reduce uneven wear and tear on the mattress.

Benefits of using plywood:

  • Enhanced support: plywood provides additional support to help prevent further denting of the mattress.
  • Extends the life of the mattress: By improving the support structure of the mattress, plywood can extend the life of the mattress.
  • Affordable: it is a less costly restoration option compared to purchasing a new mattress.


Ensure that the plywood is the right size for your bed frame to avoid discomfort or damage to your mattress.

Consider using breathable plywood to keep your mattress ventilated and prevent mould growth.

Before considering using plywood, it is important to assess the cause of mattress sagging. If the sinking is caused by damage to the mattress itself, simply putting plywood underneath may not solve the problem completely. For memory foam mattresses, hybrid mattresses, or gel memory foam mattresses, making sure they are properly supported is key to maintaining mattress performance and comfort.

Next, we'll look at why mattresses collapse and delve into the various causes of this problem.

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5. Why is my mattress caving in?

Mattress collapse can be caused by a variety of factors, and understanding these causes will help us take effective measures to prevent and repair the problem. The main causes include:

  • Long-term use and material deterioration: Over time, the filling material in a mattress may compress due to long-term load bearing, especially for materials such as memory foam mattress and gel memory foam mattress, which are more prone to deformation over time.
  • Uneven loading and pressure: If you always sleep in the same position on the mattress, or if the mattress fails to support your body weight evenly, this can lead to excessive sinking of this part of the mattress.
  • Inadequate support from the bed frame and base: Unstable or worn out bed frames and bed boards that are spaced too far apart can lead to a mattress that is not adequately supported, which in turn can lead to sinking.
  • Quality issues: Low-quality mattresses made with inferior materials may develop sinking problems more quickly, especially some of the less expensive mattresses that come in a box.

Understanding the causes of mattress sinking allows us to take more targeted measures, such as choosing a firm mattress that suits your sleeping position or regularly checking the stability of your bed frame to minimise the risk of sinking.

Now, we will introduce some effective preventive measures to help you extend the life of your mattress and keep it in the best condition.

6. Preventive measures: prolonging the life of your mattress

To minimise the risk of mattress denting, it is vital to take effective preventative measures. Here are some tips to help you keep your mattress in tip-top shape:

  • Rotate and flip your mattress regularly: Unless your mattress is designed for single-sided use, it is recommended to rotate or flip it every three to six months to promote even wear.
  • Choose the right frame: Ensure that your frame or bed base is firm and provides even support, especially for memory foam mattresses, hybrid mattresses and gel memory foam mattresses that require extra support.
  • Distribute the load: Avoid prolonged sitting and lying in the same position on the mattress to spread the pressure caused by use.
  • Use a mattress protector: A mattress protector prevents stains and liquids from penetrating the interior of the mattress, reducing the risk of material damage.
  • Consider sleeping position and weight: Choosing the right type of mattress for your sleeping position and weight can help reduce over-compression and indentation.

By taking these precautions, you'll not only extend the life of your mattress, you'll also be able to enjoy a more comfortable and supportive sleep environment. Remember, choosing the right type of mattress for your needs is key to maintaining a good night's sleep.


Mattress depressions can be a headache, but by understanding their causes and taking the proper preventative and restorative measures, you can effectively address the problem and ensure that your quality of sleep is not compromised. Whether it's flipping your mattress regularly, using plywood for added support or choosing the right type of mattress for you, each step is an important part of ensuring a comfortable night's sleep.


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Q1: Can I fix a dent in my mattress?

A1: Yes, you can fix a dent in your mattress. Methods include rotating or flipping the mattress regularly, using a mattress topper for additional support, or placing plywood beneath the mattress for firmer support.

Q2: Is it normal for a mattress to dip?

A2: It's normal for mattresses, especially memory foam and hybrid types, to show some level of dipping over time due to regular use. However, significant dips can affect sleep quality and should be addressed.

Q3: How do you fix a collapsed side of a mattress?

A3: To fix a collapsed side, rotate your mattress 180 degrees to distribute wear evenly. Consider using a mattress topper or pad to even out the surface, or adjust the underlying bed frame for better support.

Q4: Should I put plywood under my mattress?

A4: Placing plywood under your mattress can provide additional support and help prevent sagging, especially if your bed frame slats are wide apart. Ensure the plywood is breathable to prevent moisture build-up.

Q5: Why is my mattress collapsing?

A5: Mattresses can collapse due to wear and tear, poor quality materials, inadequate support from the bed frame, or consistent pressure on the same spot. Upgrading the support structure or replacing the mattress may be necessary.

Q6: How often should I rotate my mattress to prevent dips?

A6: It's recommended to rotate your mattress every 3 to 6 months to ensure even wear and extend its lifespan, thereby preventing dips from forming too quickly.

Q7: What's the best way to support a sagging mattress?

A7: The best way to support a sagging mattress includes using a supportive bed frame, adding a plywood board between the mattress and the frame, or using a mattress topper to improve surface evenness.

Q8: Can a mattress topper help with mattress dips?

A8: Yes, a good-quality mattress topper can help level out dips and provide additional comfort and support, extending the life of your mattress.

Q9: How can I tell if my bed frame is causing my mattress to sag?

A9: Check if the bed frame or slats are uneven, too far apart, or damaged. A stable and supportive frame should not contribute to mattress sagging.

Q10: Is it worth repairing a sagging mattress, or should I replace it?

A10: If the mattress sagging is severe or the mattress is old, replacing it might be a more cost-effective solution. However, minor sags can often be remedied with support adjustments or a mattress topper.

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