Do I Need a Box Spring or Foundation for My Mattress?
Box springs and foundations are base components designed to support mattresses and protect them from wear. Most box springs and foundations are less expensive than other base types (such as platform beds or adjustable bases), and they also satisfy the warranty requirements of most mattress manufacturers. However, in most cases, you do not necessarilyneeda box spring or foundation to support your mattress.
What Are Box Springs and Foundations?
Box springs and foundations support mattresses by providing a buffer between the bottom of the mattress and a bed frame made of metal or wood. In some cases, a box spring or foundation may be placed between the mattress and the floor, as well. The terms ‘box spring’ and ‘foundation’ are often used interchangeably, though both terms are associated with different types of overall construction.
A traditional box spring consists of a wooden frame, steel support springs, and a cloth cover. Some newer models feature frames made of metal, rather than wood. In addition to supporting the mattress, box springs absorb shock from sleeper’s bodies and distribute weight to help prevent wear.
In recent years, foundations have overtaken box springs as the standard mattress base. Rather than springs, foundations feature evenly spaced wooden slats designed to reinforce the mattress and prevent it from crashing through the base; the closer the slats are spaced, the more supportive the platform bed will be. As a result, foundations do not absorb as much shock as box springs. However, they tend to be more suitable for mattresses that require higher levels of support and less weight distribution, such as memory foam and latex models. Foundations, like box springs, are usually encased in cloth.
|Size||Height (in.)||Height (cm.)|
|Standard/High-Profile||9 in. or taller||23 cm. or taller|
|Medium-Profile||6 to 8.5 in.||15 to 21.5 cm.|
|Low-Profile||5.5 in. or lower||14 cm. or lower|
Common Mattress Sizes
In order to provide optimal support for the mattress, box springs and foundations are constructed with the same size specifications as mattresses. A general size chart is found below; please note that some manufacturers use slightly different measurements for their mattresses and box springs/foundations.
|Size||Typical Dimensions (Width x Length)|
|Twin||39W" x 75L"|
|Twin Extra Long (XL)||39W" x 75L"|
|Full/Double||54W" x 75L"|
|Queen||60W" x 80L"|
|King||76W" x 80L"|
|California King||72W" x 84L"|
Additionally, some mattresses are available in split Queen, King, or California King models; these consist of two separate mattresses that fit together in the middle to form a complete size. Box springs and foundations may be sold in split models; however, standard box springs and foundations are usually sufficient for split-style Queen, King, or California King mattresses.
Advantages and Disadvantages of Using a Box Spring or Foundation
Some benefits associated with using a box spring or foundation include:
- Easier on and off:Due to their height, box springs and foundations allow users to get on and off the bed more easily.
- Extended mattress lifespan:Using a box spring or foundation can minimize deterioration and help the mattress last longer.
- Minimal sagging:Sagging and indentation is an issue with many mattresses, but box springs offer a flush surface to help the mattress maintain its shape over time.
- Lower price-point:Compared to other base types, box springs and foundations tend to be less expensive (see pricing chart below for more information).
There are some notable disadvantages of using a box spring or foundation, as well:
- Regular rotation:Box springs can lose their supportive qualities after too much use, requiring owners to rotate them (which can be tiring and time-consuming).
- Occupying space:Unlike platform beds (see below), box springs do not have any space for personal storage underneath the base.
- Extra costs:Although some box springs may be used on flat floors, many are designed for use with an additional frame or foundation.
Alternatives to Box Springs and Foundations
Alternatives to standard box springs and foundations include the following:
Bed Frames and Platform Beds
A bed frame provides sturdy support mattresses and sleepers. Depending on the type of bed frame, it might also include a foundation or support a box spring off the ground. Bed frames are often made of a combination of wood and metal, with foam or fabric upholstery. The most common type of bed frames include:
- Canopy beds:Frame with four posts connected to an overhead frame (or canopy) from which you can hang curtains, drapes, etc.
- Four-poster beds:Frame containing four posts which are not connected using an overhead canopy.
- Panel beds:Also called “box spring beds,” these include flat wooden panels for the headboard and footboard as well as side rails to support both a mattress and base.
- Sleigh beds:A bed with a curved headboard and footboard that resembles a wooden sleigh.
Aside from using bed frames, a platform bed is another possible choice. These are designed to support a mattress without the use of a base. Platform beds use evenly spaced wooden or metal slats or lattices in place of a foundation.
Adjustable bed bases feature foundations that can be raised at the head or foot (or both) to create different angles for sleeping. Some adjustable beds are split lengthwise to allow both halves of a mattress to operate separately.
These beds can relieve a variety of ailments while promoting an increase is overall sleep quality. For example, adjustable beds typically allow the top half of the bed to be raised, elevating the head. Sleepers often snore due to poor head elevation. By providing upper body elevation, their airways open up and snoring ceases.
Some adjustable beds include massage functions and even a zero-gravity feature that creates an S-shaped sleep surface, which is ideal for those with lower back pain or high blood pressure. It’s even possible to find adjustable beds that come with silent alarms that vibrate the bed, gently waking you each morning.
Putting a mattress on the floor
Some sleepers choose to stack their mattresses directly on the floor, although whether it’s a good idea is a hot topic. There are some positives to simply forgoing a bed frame. For instance, putting your bed on the floor allows cool air to move across the surface of the bed, helping you sleep cool and comfortable all night. As bed frames can run $150 to $200, skipping on buying one can save money.
That said, there are important drawbacks to acknowledge, such as issues with insects, dust mites, or other pests. Additionally, keeping your mattress on the floor could lead to abnormal wear and tear that might void its warranty. Make sure to carefully consider the type of mattress you buy and whether just placing it on the floor is worth it.
How Much Do Box Springs, Foundations and Other Bed Bases Cost?
Like mattresses, the cost of a box spring, platform bed or adjustable base will vary by manufacturer. It’s important to note that some mattress brands price their foundations by height, while others price according to size.
The table below features the average price for box springs, foundations, and different bed base types. Please note it’s priced for Queen-size beds, the most commonly purchased type of bed.
|Bed Base Type||Average Price Range (Queen)||Description|
|Box spring||$100 to $300||A bed base with a sturdy wooden frame, containing springs with a cloth cover on top|
|Foundation||$200 to $500||Reinforced slats that support the mattress and protect it from falling through the base|
|Platform bed||$400 to $800||Raised bed base that uses slats or lattice-structure to support bed without a foundation|
|Adjustable bed||$900 to $1,500||Bed base with adjustable head and foot that can raise or lower the body into multiple positions|
The vast majority of mattresses sold today come with warranties that generally range from 10 to 25 years in length. In most cases, the warranty will specify certain types of bases that may — and may not — be used to support the mattress. Specifications vary from brand to brand, but the following guidelines are common in most mattress warranties:
- Foundational support:Most mattress warranties allow any type of base — including box springs, foundations, platforms, and adjustable bases — as long as they provide adequate support for both the mattress and its sleepers.
- Frame Construction:Although this is not always stressed, some brands require certain types of frames for mattresses based on their size. Commonly, a frame with at least four legs is needed for Twin- and Full-size mattresses; and a frame with five to six legs is needed for Queen-, King- and California-King-size models. Strong center support is also required for all sizes.
- Slat dimensions:The warranty may require certain slat measurements if a foundation or platform bed is used to support the mattress. In most cases, slats may not be spaced further than 2 to 3 inches apart.
If a mattress owner does not abide by these terms, then their warranty will be voided if improper foundational support leads to sagging, indentations, or other types of premature wear. It’s important to note that relatively old box springs or foundations — generally speaking, those that have been in use for more than three years — may not provide the ‘adequate support’ listed in mattress warranties. If a claim is filed for a damaged mattress, then the box spring or foundation may be inspected by the manufacturer — and if it is found to be faulty, then the warranty will be voided.
Bottom line: mattress owners do not necessarily need to buy a matching foundation, platform, or adjustable base for their new mattress — but if their original box spring or foundation has been in use for more than three years, then it may not satisfy the support requirements laid out in the mattress warranty.
A box spring, foundation, or other type of base (such as a platform bed or adjustable base) is generally recommended for most mattresses sold today — and in many cases, a suitable base will be required to keep the warranty valid.
If you need to decide whether to purchase a base with your new mattress or continue using your current model, here are a few things to ask yourself:
- Have I owned/used the box spring or foundation for more than three years?
- Have I experienced sagging, indentations, or other types of wear on my current mattress using the same box spring or foundation?
- Are the slats on my foundation evenly spaced to meet the warranty terms of the mattress I want to buy?
- Is a new box spring, foundation, or other mattress base in my shopping budget?
How long does a mattress last?
My mattress is getting on in years. In fact, Bill Clinton was in his first term as president when I last bought a new one. Is it time for me to replace my mattress?
You’ve probably logged more than 30,000 hours in your bed, and your mattress has likely become less comfortable and less supportive. But there’s no set formula for determining when you need to replace a mattress. It might be time to buy one if:
•You regularly wake up tired or achy—you make Oscar the Grouch seem as cheerful as Mr. Rogers.
•You tend to sleep better away from home, than in your own bed. Are you planning unnecessary business trips or looking for any reason to go on a weekend getaway?
•Your mattress looks or feels saggy or lumpy—it needs go on the Abs Diet.
•You’re over age 40 and your mattress is five to seven years old. Remember, your body tolerates less pressure as it ages. As if getting older weren’t tough enough . . .
A mattress can be an expensive investment—we’ve tested models that cost in excess of $4,000—but if you treat your new one properly, it could easily last 10 years. Our advice:
•Don’t let your kids use your bed as a trampoline.
•Rotate your mattress. If you have a single-sided mattress (you sleep on only one side), rotate the mattress from end to end—that is, move the mattress 180 degrees. The foot of the mattress is now at the head, and vice versa.
If you have a double-sided mattress, rotate it as above, then turn it over so the bottom is now on top.
Perform these steps every two weeks for the first three months you have your new mattress, then once every two months thereafter. You’ll find illustrated instructions on a number of different Web sites.
• Use a bed frame that has a center support.
Essential information:See “How to buy a mattress without losing sleep” for detailed advice on finding the perfect bed. And watch our video buying guide.
How Long Do Mattresses Last?
Mattresses are an integral part of our nightly routines, but when is the right time to replace them? Many mattress owners wonder this question and many most. How long are mattresses good for? How long should your mattress last? To answer how long do mattresses last, it is important to examine the multitude of factors that contribute to the lifespan of mattresses. There is no simple answer to these questions as it can vary significantly based on the type of mattress, the quality of the materials used in its construction, the materials it is made out of, and many more variables. This makes determining the lifespan of a mattress difficult, but there are a number of general rules of thumb you can use when analyzing a mattress to determine roughly how long it will last for. To help you determine how long you can expect a natural mattress to last for you, we have put together a guide that delves into the main factors that contribute to the lifespan of a mattress and broken it down into sections that will make evaluating your mattress much simpler.
Signs That You Need to Replace Your Mattress
Before we delve into specific factors to analyze to determine the lifespan of your mattress, it is important to consider some of the main signs that you need to replace your mattress. These warning signs will help let you know that it is time for you to purchase a new mattress, regardless of what type of mattress you have, the quality of materials, or how long you have had it. These are helpful to keep in mind and identify when you notice them so that you do not unintentionally disrupt your sleep schedule, slip into the habit of getting a poor quality of sleep, or exacerbate muscle and joint aches by sleeping on a mattress that is past its prime. Below are a few warning signs that you need to replace your mattress.
– If your mattress is developing sags, indentations, or you can feel springs in your back, then it is extremely important that you replace your mattress.
– If you are feeling irritated, achy, or in pain when you wake up a from a night of sleep, then you are not getting the quality of sleep you need and your mattress may be causing you pain.
– If you feel that you can get a better night of sleep when you are sleeping somewhere other than your mattress, such as on the couch, in a hotel room, or at the home of friends or family.
– If you have had the same mattress for six to eight years and you are over the age of forty, then it is likely that you need to replace your mattress. As you age, your body becomes more sensitive to your mattress and less able to adjust to pressure increases that can occur in mattresses that are this age.
With these warning signs in mind, it is now important to analyze one of the most important factors that will contribute to the lifespan of your mattress: the type of mattress it is.
Consider the Type of Mattress
The type of mattress you have is the most significant determinant of how long your mattress will last. Over time, the mattress industry has developed a number of different types of mattresses that have continually been updated and innovated as technology and research have progressed. This has allowed individuals to select a mattress that is uniquely tailored to their body and sleeping habits to give them the best night of sleep possible. While the plethora of mattress options available have given individuals the ability to choose from a range of different mattresses, it also requires consumers to become educated about what types of mattresses are available and their respective benefits and disadvantages in order to make an educated and informed decision. Below is a breakdown of a few of the most popular types of mattresses available and how long their lifespan is expected to be based on their composition and features.
If you own an innerspring mattress, it is likely that you have asked yourself, “How long does a spring mattress last?” For consumers that are looking for a long-lasting mattress, then it may be best to stay away from innerspring mattresses as they are often known to develop indentations and sags over the course of time. To understand how this occurs, it is important to understand the constructions of an innerspring mattress. An innerspring mattress may use a traditional coil system or a pocketed coil system. In a traditional coil system, the coils are wired together. This can make it more difficult for the mattress to counteract motion transfer as it occurs. On the other hand, a pocketed coil innerspring mattress is constructed using steel coils that are independently wrapped in fabric and function independently.
As you look for an innerspring mattress, it is likely that you will encounter two main specifications: the coil number and the coil gauge. The higher the number of coils in the mattress, the more supportive it will be. As you consider the coil gauge, keep in mind that the higher gauge actually is a thinner coil, which can be counterintuitive. The most common coil gauges used in innerspring mattresses range from twelve to fifteen with firmer mattresses falling at a fourteen gauge and higher and softer mattresses falling at a thirteen gauge and lower. When assessing the durability of the mattress, thinner coils often offer less durability than a thicker gauge coil. On top of the coils, many mattresses have layers of different materials to create a soft and supportive top surface. The quality and type of materials utilized in this top comforter layer can also affect the longevity of the mattress, with cheaper materials, like polyester, lasting a shorter duration than higher-quality materials. On average, it is recommended that an innerspring mattress is replaced within eight years as the coils will often come loose over time, which can result in body aches and pains. An innerspring mattress may need to be replaced sooner than eight years as well, depending on the type and quality of its materials.
Foam mattresses are one of the most popular options available on the mattress market, but not all-foam mattresses are created equal. There is a significant variance in the type of foam used and each type can affect the longevity of the mattress. One of the most commonly utilized types of foam is polyurethane. Polyurethane is also usually the cheapest option and with its lower price tag comes a decreased durability. When looking at a polyurethane foam mattress, it is important to look at the foam density to get a better sense of how long the mattress will last. A polyurethane foam mattress that does not mention density, will likely not last long. The higher the density is, the longer you can anticipate the mattress will last. It is important to keep in mind that many polyurethane foams are laced with harmful chemicals and toxins that are used to boost its flame retardancy and are a byproduct of its manufacturing process. Not only does this option not give you durability, but it can also be exposing you to toxins. Warning signs that you need to replace a polyurethane foam mattress are that the foam is sagging or that when you lay on the mattress you feel as if you are sinking into the bed.
Another type of foam mattress to consider is a convoluted foam mattress. If you are unsure what a convoluted foam mattress is, it is likely you will recognize its shape, but not its name. Convoluted foam is a foam that resembles the inside of an egg carton, like the ones you see in the grocery store. However, similar to polyurethane foam mattresses, convoluted foam mattresses are also not known for being extremely durable. Convoluted foam mattresses can give you support and comfort in the short-term, but unfortunately, this often does not last long before the foam begins to sag and needs to be replaced. To stretch the longevity of a convoluted foam mattress, make sure there is only one convoluted later and target a high-density foam construction.
While polyurethane and convoluted foam mattresses do not possess notable durability, memory foam mattresses are a much better option when comparing longevity. One of the main reasons for this increased longevity is that memory foam mattresses often have a much higher foam density than lower-quality foams mattresses. Many consumers like memory foam mattresses because they contour to the body, but this also means that body weight is a significant factor that can impact how long a memory foam mattress will last. When selecting a memory foam mattress, make sure you target a higher density as this will increase its durability and be sure to research the type of memory foam as some memory foams may contain harsh chemicals. A high-quality memory foam mattress can last between eight and ten years, depending on the other factors at play. However, if you notice your memory foam mattress is developing lumps, is sagging, is retaining impressions longer than it previously did, or if you notice an increase in allergic symptoms, then it is time to replace your mattress.
The most durable among the foam mattress options are latex foam mattresses. If you are looking for a durable mattress that will stay supportive and comfortable throughout the years, then a latex foam mattress is likely the right choice for you. Latex foam mattresses are extremely durable. As with the other foams, the higher density the latex foam is, the most durable it will be and the longer it will last you. It is important to understand that latex foam mattresses are broken down into two main categories: natural and synthetic blends. The names may give you an indication of the main difference between these two types of latex foam mattresses, but to understand the significant it is important to compare them.
Synthetic latex foam mattresses are manufactured using petrochemicals, which can expose you to harsh chemicals and toxins that can adversely affect you. You sleep on your mattress every night for a long period of time, making this exposure significant to note. In addition, synthetic latex foam mattresses are less durable than a natural latex foam mattress, which is why they often come at a lower price tag. On the other hand, natural latex foam mattresses are made using a natural resource, the rubber tree. Natural latex foam possesses a significantly higher level of elasticity, which boosts its durability and longevity considerably. While a natural latex memory foam mattress may cost more, it is an investment into a quality mattress that will be the healthiest and most long-lasting choice and will not require the frequent replacement that other lower-quality, toxin-laden mattresses do. Look for a natural latex memory foam mattress that is certified organic to find the ideal mattress for both comfort and durability. Essentia’s mattresses are made using natural and organic materials to form a durable, supportive mattress that will give you a better night of sleep and the durability you are looking for. The majority of Essentia’s mattresses come with a twenty-year warranty, making them a reliable investment into a great night of sleep.
Other Factors that Can Affect Mattress Longevity
While the type of mattress is the most important factor in determining how long your mattress will last, there are many other factors that should be considered when determining the longevity of your mattress. Below are a handful of other factors that can affect how long your mattress will last.
If you’re ready for a replacement, don’t forget to check out these 5 things you need to know about natural mattresses before you take the plunge!
How Long Does a Latex Mattress Last?
People love latex mattresses for many reasons.
They are comfortable, incredibly durable, hypoallergenic, mold-resistant, and don’t make you sleep hot. What else do you need from a mattress?
Now, latex mattresses are alsothe most expensive option on the market, so it’s totally natural to have concerns about durability and lifespan. After all, you surely want your purchase to eventually pay off.
So, let’s see how long latex beds can last and what factors impact their lifespan in the long term.
What Makes Latex Beds Durable?
Latex mattresses have the longest lifespan among all types of mattresses available today. They can serve for at least 12-15 years while maintaining their supportive properties. Some latex beds can make it even up to 20 years.
But what makes natural latex so durable?
Well, there are at least three reasons for that:
- Foamy cell structure.Latex foam is made of the sap of rubber trees through the process of vulcanization. This results in a stable foamy structure with a specific latex-like feel. However, the cells of the latex foam are very tiny and have rigid membranes, which doesn’t allow the debris and organic particles to build up there, which means dust mites, bed bugs, and other nasty creatures won’t be tempted to reside in your bed.
- Breathability.Even though latex cells are densely packed, they have an open structure, which means that each of them has tiny pores to connect with the others. This makes latex very breathable (and hence cool to sleep on) and protects it from mold development.
- Rebound.This refers to how quickly a mattress will regain its shape after you remove the pressure. Latex has a great rebound, which allows it not only to cradle your body and relieve your pressure points but also to restore cell structure and keep it more consistent.
Note that even though latex is claimed as hypoallergenic material, some people still may have a hypersensitive reaction to it (also known as latex allergy).
Factors That Can Impact the Lifespan of a Latex Mattress
Now, even though every mattress type has its expected lifespan, certain factors can add or subtract a couple of years from that estimated time frame.
In the case of latex beds, here are the main factors.
Type of Latex
When purchasing a latex mattress, you will be choosing among the three possible types:
- Dunlop Latex.Dunlop latex is manufactured through a more energy-efficient process. To put it simply, latex sap is foamed, poured in a mold, then vulcanized, washed, and dried. This results in the density gradient from top to bottom — the bottom is denser, whereas the top is foamier and less dense. Thanks to that, Dunlop latex layers are more resilient and durable.
- Talalay latex.Talalay manufacturing process involves roughly the same steps as the Dunlop process, but with additional stirring and filtering stages that allow making a more homogeneous structure. Surprisingly, Talalay latex may be less durable and resilient compared to Dunlop, but some users mention that it’s more cradling. Nevertheless, the differences in the feel and durability will be hardly noticeable for an average user.
- Latex blend.This is basically natural latex blended with chemicals in different proportions. Even though this material isn’t completely natural, some additives can make latex more long-lasting and capable of withstanding more active exploitation.
The differences in manufacturing processes might affect the lifespan of your latex mattress, but it won’t be dramatic.
If you want to make the right purchase, check out this review of latex mattresses at Latex Mattress Buyers Guide .
Your Bedroom Conditions
The climate you live in, as well as the microclimate in your bedroom, may also affect the durability of the mattress you choose. For example, high humiditymay lead to moisture build-up inside the mattress, so even a latex mattress might develop mold and funky odors when used in a humid environment.
If you live in higher temperatures or use the heater during cold months and place it close to your mattress, latex resiliency may suffer. While this material is naturally fireproof, it might still be affected by higher temperatures andlose its rebound.
So, make sure your bedroom offers proper conditions for your latex mattress.
Aside from all-latex mattresses, there are mattresses that have one or two latex layers along with foam or other materials. This is abudget-friendly solutionfor those who want the benefits of latex but cannot afford to buy a 100% natural latex mattress.
But here’s the tricky thing about this solution:
Some manufacturers might advertise such models as being “latex”. So, less attentive customers could be deluded into thinking they are buying a product that will outlive its owner.
In reality, though, other materials are likely to reduce the overall durability of the mattress. For example, polyurethane or memory foam might start sagging sooner, so your mattress will no longer offer uniform support.
So, be careful and shop smart. It’s the only way to get a mattress that will last.
How Long Does A Box Spring Last?
Shop Boxsprings by Clicking on Photo.
Do you knowHow Long Does A Box Spring Last?Interestingly nearly one half of the people shopping for new beds opt to purchase just a new mattress. They do this because they believe that their existing box spring is fine without having inspected it for problems first. Squeaking noises, sagging mattress, popping noise, lack of support, and not sleeping well. The signs are there unfortunately too many shoppers are missing them even though their bed is terribly uncomfortable. Are you missing the signals of a bad boxspring? Do you know what they are?
So How Long Does A Box Spring Last?
It depends on its original construction and depending on which of the following questions applies to yourbase. The fact is a box spring could last just a couple of years or up to and in excess of 20 years. There are high quality box springs and poor quality box springs some are wooden foundations that can be built mearly to hit a cheap retail price point, while others are built to the highest quality standards available. We tell people if you are unsure the rule of thumb these days is 8-10 years.
What do I need to know about my old foundation?
First and formost was it built well using solid construction? Did the manufacturer cut corners by using cheap softer weaker lumber or use hardwood . Does the foundation have plenty of wood slats? Is there more than one support beam running head to toe especially of queen size bases? Is it constructed using any steel? Were coil springs or torsion bars added to absorb energy and extend box spring life?
How can I tell if my box spring is bad?
Does the box spring squeak?Squeeking is a sign of weak joints that are beginning to loosen up.
Are there broken slat?Sometimes this is obvious other times the dust cover on the bottom must be be taken off most are only held in with staples that must be removed.
Is the box spring sagging or bowed?Remove the mattress and lay a straight edge across the surface. If their is a sway throw it away. Set it on a level floor if there is a bow it must go.
Are the coils over 10 years old?If it has steel coil springs these support bases are typically worn by 10 years of age or have begun to fatique and loose there ability to properly spring back properly or give adequate support to the mattress.
Look for broken or loose springs.This is a sure sign or a boxspring that will not last under another mattress.
Is the steel grid bent or broken?The grid surface used on some box springs is the level support a mattress rests upon without a level sturdy support suftace the mattress will wear prematurely.
Author: Douglas Belleville
Doug Belleville and his father Dave own and run STLBeds – a specialty sleep store located in Arnold, MO. The staff at STLBeds is highly educated about sleep, comfort and their special sleep products. STLBeds only carries high quality mattresses and bed-related products. You won’t find the brand names here – click here to find out why!
I have my mattress set for 10 years now and the foundation is a split box spring for a Queen. The mattress is done for and I am in the market to buy a new one. However, I am unsure if I can trust my split box spring set and just buy a mattress, or if I should buy another split box spring set with the new mattress.
The mattress set was an American Signature.
Do you think it would be worth it to buy a new split box spring?
Thanks for your input,
Sarah, Box Springs include springs and springs flex and fatigue. Replacing is a must. High quality foundations are nothing more than a pallet. If it is still structurly solid, does not squeak or have give you should be good. If you do not know, do not chance it. Replace it. Hope this helps Doug