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How to Measure Mattress Sag for Warranty Claims

How to Measure Mattress Sag for Warranty Claims

Mattress Resources
Read Time: 7 minutes

  • Mattress warranties typically range from 5 to 25 years but may not reflect the mattress’s actual lifespan.
  • Prorated warranties decrease in coverage over time, requiring the mattress owner to pay a percentage of the replacement cost for claims made after a certain period.
  • Proper maintenance, including using a mattress cover, selecting a suitable foundation, and following care instructions, is crucial to maintaining mattress warranty validity.

When purchasing a new mattress, understanding the warranty is crucial. Mattress warranties protect against defects or workmanship issues with the mattress. However, if you experience significant sagging in your mattress, you may be eligible for a warranty claim. To ensure your claim is successful, it’s important to measure the depth of the sag accurately. This comprehensive guide will take you through measuring mattress sag for warranty claims.

Understanding Mattress Warranties

Before diving into the measurement process, it’s essential to understand the basics of mattress warranties. Most mattress warranties offer coverage for a period, typically between 5 and 25 years. However, the warranty length does not necessarily reflect the mattress’s lifespan.

Warranties can vary between manufacturers, so it’s important to familiarize yourself with the specific terms and conditions. Some warranties may require using a proper foundation or void the warranty if the mattress is damaged during transportation.

Prorated vs. Non-Prorated Warranties

Many warranties are prorated, which means the coverage decreases over time. If a warranty claim is filed after a certain period, the mattress owner may be responsible for part of the replacement cost. In contrast, non-prorated warranties provide full replacement coverage throughout the warranty period.

Warranties also differ in what they cover. While some warranties only cover sagging defects, others may include broken coils, manufacturing defects, or other issues that may arise over time.

Implied and Limited Warranties

It’s important to understand the difference between implied and limited warranties. Implied warranties are not directly mentioned but are understood to be present. Limited warranties have specific terms and conditions outlined by the manufacturer.

When filing a warranty claim, reading and understanding the warranty terms and coverage is crucial. This information will help you prevent any warranty claim problems and keep your mattress in excellent condition.

Components of a Mattress Warranty

Understanding the components of a mattress warranty is crucial for making a successful warranty claim. While most warranties cover manufacturing defects and excessive sagging, none are the same. Some warranties may have specific terms and conditions impacting your coverage.

Prorated Warranties

Mattress manufacturers often offer prorated warranties and cover the cost of a defective mattress on a sliding scale based on the warranty length. In the early years of the warranty, the manufacturer typically covers the full cost of replacing a defective mattress. However, as time goes on, the warranty coverage declines.

Non-Prorated Warranties

Non-prorated warranties provide full replacement costs throughout the entire warranty length. However, they may have specific terms and conditions impacting coverage, such as using a proper foundation.

Warranty Terms and Coverage

It’s important to review the warranty terms in detail, paying attention to the coverage duration, exclusions, and limitations. Some warranties may only cover specific defects, require a certain number of broken coils, or exclude normal wear and tear.

Additionally, warranties may have combination warranties that cover specific components of the mattress, such as a separate warranty for the mattress cover. It’s vital to understand your mattress warranty’s specific terms and coverage to ensure you’re eligible for warranty claims.

What Might Void a Mattress Warranty

Several factors can void a mattress warranty, including improper use and maintenance, improper foundation use or damage caused during transportation. Failure to follow the warranty terms could result in a voided warranty and denied claims.

For example, using an improper foundation, such as a box spring instead of a solid bed or a platform bed without enough surface area, could void your warranty. Similarly, the warranty may be voided if the mattress is damaged during transportation due to insufficient protection.

Additionally, not all mattresses will qualify for warranty claims. The manufacturer may not honour the warranty claim if the mattress has excessive sagging due to an improper sleep surface, such as a worn-out bed frame. Determining if your mattress is eligible for warranty coverage is essential before making a claim.

It’s crucial to grasp the elements of a mattress warranty to safeguard your investment and ensure you maximize the lifespan of your mattress.

Measuring Mattress Sag

Accurately measuring mattress sag is a critical step in making a warranty claim. To measure sag depth, follow these steps carefully:

  1. Begin by using a measuring tape or ruler.
  2. Place the measuring tool at one end of the sagging area.
  3. Run the tape along the surface of the mattress to the deepest point of sag.
  4. Note down the measurement.
  5. Repeat this process in different mattress areas to calculate the average sag depth.

The sagging must exceed the warranty threshold to qualify for a warranty claim. Excessive sagging can cause discomfort and poor sleep quality. Therefore, measuring the sag or body impression correctly is crucial to ensure your mattress meets the warranty requirements.

Remember, accurate measurements are essential for a successful warranty claim. Incorrect measurements can result in a denial of the claim. By following these steps closely, you can ensure your measurements are accurate.

Next, explore the warranty claim process and understand how to make a successful claim.

Understanding Warranty Claims

When making a warranty claim for your mattress, it’s important to understand the process and criteria for approval. Most mattress warranties cover manufacturing defects and broken coils, but normal wear and tear or damage caused by improper use may void the warranty.

To initiate a warranty claim:

  1. Contact the mattress retailer or manufacturer.
  2. Be prepared to provide accurate measurements of the sag and any necessary documentation.
  3. Follow the instructions provided by the warranty claim team for further assessment.

By familiarizing yourself with the warranty claim process, you can ensure a successful claim if required. Properly care for your mattress by using mattress protectors and ensuring it’s on a proper foundation or bed frame that provides adequate support. Failure to maintain your mattress properly may void the warranty coverage.

Initiating a Mattress Warranty Claim

If you believe your mattress qualifies for a warranty claim, contact the mattress retailer or manufacturer. This typically involves providing them with accurate sag measurements and any necessary documentation.

Remember that failure to maintain your mattress properly may void the warranty. Get to know the warranty terms to understand how to process the claims.

Be prepared to follow any instructions or requests the warranty claim team provides for further assessment. They may ask for additional information or schedule a warranty claim inspection.

Note that improper use and damage caused by you may void the warranty. If this is the case, the warranty claim team may deny your claim, even if the sagging of the mattress meets the threshold requirements. Therefore, it’s important to take proper care of your mattress to keep the warranty in effect and avoid any mishaps that could void the warranty coverage entirely.

Understanding Prorated Warranties

It’s essential to understand the terms of your mattress warranty, especially if it’s a prorated warranty. Prorated warranties decrease over time, meaning any claim made after the initial warranty period may require you to pay a percentage of the replacement cost.

For example, suppose your mattress warranty is ten years and has a prorated warranty after the first five years. Any claim made during the period may require you to pay a percentage of the replacement cost. Learn about the warranty terms and coverage for each warranty period to help you decide if you should make a claim and understand any extra costs involved.

Remember, maintaining your mattress properly throughout the warranty period is imperative to avoid mishaps that may void your warranty.

Tips to Maintain Your Mattress Warranty

To ensure your mattress warranty remains valid, follow these tips and recommendations:

  1. Use a mattress cover: A mattress protector helps keep your mattress clean and protects it from spills, stains, and dust mites. Select a cover compatible with your mattress materials to avoid voiding the warranty.
  2. Select a proper foundation: Every mattress has specific requirements for a bed foundation to keep the warranty valid. Ensure your foundation provides ample support and is compatible with your mattress’s size and weight. Avoid using an old or damaged foundation, as it could impact the mattress’s lifespan and void the warranty.
  3. Follow care instructions: Different mattress materials require different instructions to maintain quality and extend lifespan. Follow the manufacturer’s care instructions closely, including guidelines for cleaning and rotating/flipping the mattress.
  4. Be aware of warranty terms: Check the coverage and length to ensure your mattress is eligible for warranty claims. Not all warranties cover the same issues, and some may have clauses that void the warranty in specific situations.

Following these tips can avoid potential warranty issues and ensure your mattress’s warranty coverage. Proper care and cleaning of your mattress can also help extend its lifespan and provide comfortable sleep for years.


What type of mattress sags the least?

Choose a mattress type with high-quality materials and construction to minimize mattress sagging. Memory foam and latex mattresses are referred to for their durability and resilience, which provide better support and reduce the likelihood of sagging. Hybrid mattresses, which combine pocketed coils and memory foam, provide a balance of comfort and support, contributing to a longer mattress lifespan with minimal sagging.

How do you measure a dip on a mattress?

To measure a dip or sag in your mattress:

  1. Use a straight-edge tool or a taut string to span across the surface.
  2. Place a ruler or tape measure at the deepest point of the sag and measure the distance from the straight edge to the lowest point.
  3. Refer to your mattress warranty guidelines for accurate measurements, as they often specify the acceptable depth of sags.

Can a sagging mattress be fixed?

In some cases, a sagging mattress can be improved without replacing it. Regularly rotating the mattress, using a mattress topper for added support, or placing a piece of plywood or a bunkie board between the mattress and the box spring (if applicable) can help alleviate minor sags. However, investing in a new, high-quality mattress that better suits your comfort and support needs may be more effective for more severe sagging issues, especially in older mattresses with health issues.

How long should a mattress last before sagging?

The lifespan of a mattress before sagging depends on factors such as mattress quality, materials used, and usage patterns. A good-quality mattress lasts 7 to 10 years before significant sagging occurs. Regularly rotating the mattress, using a mattress protector, and following the manufacturer’s care guidelines can extend the mattress’s life and delay the onset of sagging.

Is it bad to sleep on a sagging mattress?

Sleeping on a mattress that sags can lead to discomfort, interrupted sleep, and possible back issues. A sagging mattress fails to provide adequate support, causing uneven pressure on the body and potentially contributing to poor spinal alignment. Over time, this may lead to aches, pains, and difficulty getting restful sleep. Address support issues promptly by adding mattress toppers to fix a saggy mattress. Consider a replacement mattress to ensure a comfortable and supportive sleep surface if necessary.


In order to maintain the warranty coverage of your mattress, it’s important to care for it properly. If you believe your sagging mattress meets the warranty criteria, don’t hesitate to contact the retailer to initiate the warranty claim process. Ensure you have all the necessary information and documentation required. If needed, you can make a successful warranty claim by accurately measuring mattress sag and following the steps provided in this guide. Understanding the terms and conditions of your mattress warranty is crucial to receiving the maximum benefit from the coverage.

Don’t forget to maintain your mattress properly to avoid any damage or wear and tear that may void the mattress warranty’s coverage. Even a mattress designed to resist sagging needs proper care to maintain its durability. 

Harrison Wall is Sleep Junkie’s business strategist and sleep analyst. He also authors posts on bedding and mattress accessories. Harrison regularly coordinates with new mattress companies and tests their products to determine what really helps you get better rest and have brighter mornings.

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