How to Measure Mattress Sag for Warranty

By Geoff McKinnen Certified Sleep Coach

Last Updated On May 28th, 2024
How to Measure Mattress Sag for Warranty

Key Takeaways

  • Understanding Mattress Warranties: Familiarize yourself with the basics of mattress warranties, including the coverage period, prorated vs. non-prorated warranties, implied and limited warranties, and specific terms and conditions. This knowledge is crucial for determining whether your mattress qualifies for a warranty claim.
  • Measuring Mattress Sag: Accurate measurement of mattress sag is essential for a successful warranty claim. Use a measuring tape or ruler to determine the depth of sag by measuring from the surface to the deepest point. Repeat the process in different areas and calculate the average sag depth.
  • Initiating a Warranty Claim: If you believe your mattress qualifies for a warranty claim, contact the mattress retailer or manufacturer to initiate the process. Be prepared to provide accurate measurements, follow instructions for further assessment, and understand the terms and conditions of the warranty to ensure a smooth claim process.

If you have experienced a significant sag in your mattress, you may be eligible for a warranty claim. However, to ensure your claim is successful, you need to accurately measure the depth of the sag.

In this guide, we will take you through the steps of how to measure mattress sag for warranty claims. Understanding the correct measurement process and the warranty terms and conditions is crucial to determining whether your mattress qualifies for a claim.

Save $450 On Any Mattress

Plus free shipping

Get $450 OFF Mattresses

By following the instructions carefully, you can make sure you get the maximum benefit from your mattress warranty. Read on to learn more about the prerequisites you need to prepare and the steps you need to follow to complete the process smoothly.

Quick Guide: A 30-Second Summary

Best Mattress with Warranty Amerisleep AS3

Understanding Mattress Warranties

When purchasing a new mattress, it’s essential to understand the basics of mattress warranties. Mattress warranties are agreements between the manufacturer and the buyer that protect against defects or workmanship issues that may arise with the mattress.

Warranties vary between mattress manufacturers, but most offer coverage for a set period, typically between 5 and 25 years. However, the warranty length does not necessarily reflect the mattress’s lifespan.

It’s important to note that not all warranties are the same. Some may have specific terms and conditions, such as requiring the use of a proper foundation or voiding the warranty if the mattress is damaged during transportation.

Prorated vs. Non-Prorated Warranties

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

In addition, mattress warranties differ in what they cover. Some warranties may only cover sagging defects, while others cover broken coils, manufacturing defects, or other issues that may arise over time.

Implied and Limited Warranties

It’s also important to understand implied and limited warranties. Implied warranties are warranties that are not explicitly stated but are assumed to exist. Limited warranties, on the other hand, have specific terms and conditions.

When filing a warranty claim, make sure to read and understand the warranty terms and coverage. Knowing your mattress’s warranty can help you avoid any potential warranty claim issues and keep your mattress in top condition.

Components of a Mattress Warranty

When it comes to mattress warranties, it’s essential to understand what’s included and what might void the warranty. In general, mattress warranties cover manufacturing defects and excessive sagging, but not all warranties are the same. Some warranties have specific terms and conditions that could impact your warranty coverage.

Prorated Warranties

Prorated warranties are often offered by mattress manufacturers 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, but as time goes on, the warranty coverage declines.

Non-Prorated Warranties

Non-prorated warranties, on the other hand, provide full replacement costs throughout the warranty length, but they might have specific terms and conditions that could impact coverage (e.g., 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. For example, some warranties only cover specific defects, may require a broken coil count, or may not cover normal wear and tear.

Some warranties may also cover shipping or transportation costs to replace a defective mattress, while others may require you to cover the transportation and handling fees. Additionally, warranties may have combination warranties that cover specific components of the mattress (e.g., a separate warranty for the cover).

What Might Void a Mattress Warranty

Several factors can void a mattress warranty, including improper use and maintenance, not using a proper foundation, or damage caused during transportation. If you don’t follow the warranty terms, your warranty could be voided, and your claims could be denied.

For example, if you don’t use a proper foundation (e.g., using a box spring instead of a solid bed, or a platform bed without enough surface area), it could void your warranty. Similarly, if the mattress is damaged during transportation because it’s not adequately protected, it could also void the warranty.

Additionally, not all mattresses will qualify for warranty claims. For instance, if the mattress has excessive sagging due to an improper sleep surface, like a worn-out bed frame, the manufacturer may not honor the warranty claim. Make sure you know if your mattress is eligible for warranty coverage before making a claim.

Understanding the components of a mattress warranty is essential for protecting your investment and ensuring you get the most out of your mattress.

Measuring Mattress Sag

Measuring mattress sag accurately is a crucial step in making a warranty claim. You do so much as you might measure a mattress.

To get started, use a measuring tape or ruler. Place the tape at one end of the sagging mattress and run it along the surface to the deepest point of sag. Note down the measurement. Repeat this process on different areas of the mattress to get an average sag depth.

If the sagging is more than the warranty threshold, it may qualify for a warranty claim. Excessive sagging can lead to discomfort and poor sleep quality. Therefore, it’s important to measure the sag or body impression correctly so your mattress complies with the warranty requirements.

Remember, the measurements must be accurate for the warranty claim to be successful. Incorrect measurements can lead to a denial of the warranty claim. Follow these steps carefully to ensure your measurements are precise.

Next, let’s dive deeper into the warranty claim process, as understanding the terms and conditions is crucial in securing a successful claim.

Understanding Warranty Claims

When it comes to 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 it’s important to note that normal wear and tear or damage caused by improper use may void the warranty.

This is why it’s crucial to read the warranty terms carefully and make sure you meet all the requirements.

If you believe that your mattress qualifies for a warranty claim, you’ll need to initiate the process with the mattress retailer or manufacturer. Be prepared to provide them with accurate measurements of the sag and any necessary documentation, and to follow their instructions for further assessment.

By familiarizing yourself with the warranty claim process, you can ensure that you’re able to make a successful claim if required. Take proper care of your mattress by using mattress protectors and making sure it’s on a proper foundation or bed frame that provides adequate support.

Failure to maintain your mattress properly may lead to the warranty coverage being voided.

Initiating a Mattress Warranty Claim

If you experience sagging in your mattress and believe it qualifies for warranty coverage, initiate a warranty claim by contacting the mattress retailer or manufacturer. This usually involves providing them with accurate measurements of the sag and any necessary documentation.

Keep in mind that failure to maintain your mattress properly may void a mattress warranty. In addition, familiarize yourself with the warranty terms to understand the claim process.

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

Note that improper use and damage caused by you, such as jumping on the bed, may void a mattress warranty. If this is the case, the warranty claim team may deny your claim, even if the sagginess 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 otherwise void the warranty coverage entirely.

Understanding Prorated Warranties

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

For instance, if your mattress warranty is ten years, and it has a prorated warranty after the first five years, any claim made in the prorated period may require you to pay a percentage of the replacement cost.

Therefore, it’s vital to familiarize yourself with the warranty terms and the coverage you have in the different warranty periods. Knowing this information in advance will help you make informed decisions about when to initiate a claim and what to expect in case you have to pay extra.

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

Tips to Maintain Your Mattress Warranty

To make sure your mattress warranty remains valid, you need to take proper care of your mattress. Here are some tips and recommendations:

  • Use a mattress cover: A mattress protector helps to keep your mattress clean and protects it from spills, stains, and dust mites. Remember to select a cover that is compatible with your mattress materials to avoid voiding the warranty.
  • Select a proper foundation: Every mattress has specific requirements for a bed foundation that must be met to keep the warranty valid. Make sure 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.
  • Follow care instructions: Different mattress materials require different care instructions to maintain their quality and extend their lifespan. Follow the manufacturer’s care instructions closely, including guidelines for cleaning, rotating and flipping the mattress.
  • Be aware of warranty terms: Check the warranty coverage and length to ensure your mattress is eligible for warranty claims. Be aware that not all warranties cover the same issues, and some may have voiding clauses for specific situations.

By following these simple tips, you can avoid potential warranty issues and ensure the warranty coverage of your mattress. Proper care and cleaning of your mattress can also help extend its lifespan and provide comfortable sleep for years to come.


What type of mattress sags the least?

To minimize mattress sagging, we suggest choosing a type of mattress with high-quality materials and construction. Memory foam and latex mattresses are known for their durability and resilience, providing better support and reducing the likelihood of sagging.

Additionally, hybrid mattresses, combining various materials such as pocketed coils and memory foam, can offer a balance of comfort and support, contributing to a more extended mattress lifespan with minimal sagging.

How do you measure a dip on a mattress?

To measure a dip or sag in your mattress, use a straight-edge tool or a taut string to span across the surface. Place a ruler or tape measure at the deepest point of the sag, measuring the distance from the straight edge to the lowest point. This measurement will help you determine the extent of the dip.

Keep in mind that mattress warranties often specify the acceptable depth of sags, so refer to your mattress warranty guidelines for accurate measurements.

Can a sagging mattress be fixed?

In some cases, a sagging mattress can be improved without replacing it. Rotating the mattress regularly, using a mattress topper for added support, or placing a piece of plywood or bunkie board between the mattress and the box spring (if applicable) can help alleviate minor sags.

However, for more severe sagging issues, especially in old mattresses with health issues, it may be more effective to invest in a new, high-quality mattress that better suits your comfort and support needs.

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 your usage patterns. On average, a good-quality mattress can last between 7 to 10 years before significant sagging occurs.

Regularly rotating the mattress, using a mattress protector, and following the manufacturer’s care guidelines can contribute to extending the mattress’s life and delaying the onset of sagging.

Is it bad to sleep on a sagging mattress?

Sleeping on a sagging mattress can lead to various issues, including discomfort, disrupted sleep, and potential back problems. 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. We suggest you address support issues promptly through measures like adding mattress toppers to fix a saggy mattress. If need be, consider a replacement mattress to ensure a comfortable and supportive sleep surface.


Remember to take care of your mattress properly to maintain the warranty coverage. If you believe your saggy mattress meets the warranty criteria, don’t hesitate to contact the manufacturer or retailer to initiate the warranty claim process. Just make sure you have all the necessary information and documentation required.

By following the steps provided in this guide, you can accurately measure mattress sag and make a successful warranty claim if needed. Understanding your mattress warranty terms and conditions is crucial for ensuring you receive the maximum benefit of the coverage.

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

About the author

Geoff McKinnen is a writer focusing mainly on the healthcare industry and has written articles on everything from foods to help you lose weight to the connection between Alzheimer’s and sleep. Geoff’s passionate about helping readers improve their well-being to lead happier lives. Outside of work, Geoff enjoys cycling and hiking and believes that by leading a healthy lifestyle, he can help others do the same.

View all posts

Discover the ultimate sleep system

Choose your mattress

Shop top-rated mattresses with proven sleep-boosting materials.

Get a pillow

We have the perfect pillow to pair with your mattress.

Browse Pillows

Pick out bedding

Bring out the best in your mattress with our soft and breathable bedding.

Browse Bedding