Is Plywood Under Mattress a Good Alternative to Box Springs?

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James Miller
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James is an environmentalist, sustainability expert and senior editor at TheRoundup, specializing in testing non-toxic, organic and eco-friendly products. James, his wife and two daughters believe in chemical-free and zero-waste living. They aim to leave the planet in a better state than we found it, for future generations to enjoy.
James Miller
Updated: December 1, 2023

I've seen it all as a seasoned eco-friendly writer and bed connoisseur.

And let me tell you, box springs are so last century. They're bulky, lack support, and are often not very eco-friendly, and there are many box spring alternatives around that do a much better job.

So, is it any wonder that DIY plywood under mattress solutions are becoming a popular way to fix sagging mattresses?

If you're looking for a cost-efficient way to get comfortable without compromising on sustainability and quality, read on for helpful tips on how plywood can breathe new life into your old mattress.

Can Plywood Really Support a Mattress?

Why should you even consider plywood under your bed?

Well, for starters, it's a versatile, sturdy, and cost-effective option that can improve the comfort and longevity of your sustainable mattress.

Let's explore the world of plywood and why it might be the answer to your bedtime prayers.

Plywood Picks: The Good, The Bad, and The Ugly

Not all plywood is created equal.

Some types are better suited for your mattress than others.

Here's a quick rundown of what to look out for:

  • Good: Go for furniture-grade plywood made with glues and resins free of formaldehyde
  • Bad: Avoid flimsy, low-quality plywood that may warp over time
  • Ugly: Steer clear of pressure-treated plywood containing chemicals that could off-gas and harm your health

There are also many telltale signs indicating whether the plywood you're buying is good or poor.

Signs of Good Quality Plywood

  • Smooth and even surfaces: High-quality plywood should have a consistent, smooth texture without any rough patches or splinters
  • Minimal knots and defects: Fewer knots and defects indicate better quality wood has been used in the manufacturing process
  • Straight edges: Good plywood should have straight edges, making it easier to align and install under your mattress
  • Even layers: When looking at the edge of the plywood, the layers should be uniform and evenly spaced
  • No gaps between layers: High-quality plywood will have no visible gaps between its layers, ensuring better strength and durability.

Signs of Poor Quality Plywood

  • Rough and uneven surfaces: If the plywood feels rough to the touch or has visible splinters, it's likely of lower quality
  • Excessive knots and defects: Too many knots and defects in the wood can weaken the plywood and make it less durable
  • Warped or bowed edges: Poor-quality plywood may have edges that are not straight, making it difficult to install and less supportive of your mattress
  • Inconsistent layers: If the layers of the plywood are uneven or irregularly spaced, it's a sign of subpar manufacturing
  • Gaps between layers: Gaps between the layers of plywood can compromise its strength and lead to warping over time
  • Smells and mold: It's advisable to steer clear of plywood with a foul odor or mold growing on it. Such plywood may not be good quality, and its unpleasant smell might taint your mattress.

Plywood Pros & Cons: A Balanced Look

Sure, plywood has significant benefits, but it also has some drawbacks.

Let's weigh the pros and cons:

Pros

  • Affordable
  • Easy to install
  • Excellent mattress support
  • Help prevent sagging and extend the life of your mattress
  • Plywood is often made from sustainable wood sources, making it a greener choice than some alternatives
  • You can easily cut plywood to fit all bed frames, giving you the perfect fit every time
  • Unlike some box springs, plywood doesn't harbor dust mites or allergens, making it a great choice if you have allergy sensitivities

Cons

  • You may find plywood to be too firm
  • Minimal shock absorption
  • Potential for breaking if you have children who jump on your bed
  • May void your mattress warranty (more on that later)
  • Not be the most visually appealing option, especially if it's visible beneath your bed
  • Plywood can be heavy, making it difficult to move or adjust once in place
  • Low-quality plywood may have splinters or rough edges, which could cause injury or damage to your mattress
  • Plywood can reduce airflow, potentially leading to mold and mildew damage to your mattress

Sagging Mattress SOS: Alternative Solutions

If placing a slab of plywood under your mattress isn't your cup of tea, fear not!

Here are some of my favorite solutions to support a sagging mattress.

Toppers: A Comfy Boost for Your Mattress

One good way to reduce the effects of a sagging mattress (if you can't afford to replace it) is to place a supportive mattress topper on top.

They come in various materials, like memory foam, latex, wool, and organic cotton, and are designed to add extra support, enhancing the comfort of your existing mattress.

When shopping for an eco-friendly topper, look for natural materials and certifications like GOTS (Global Organic Textile Standard) and OEKO-TEX.

Buy a Sturdy Solid Wooden Bed Frame

A solid wood bed frame with slats provides even support and improves air circulation around your mattress.

Slats made of solid wood from sustainable sources, such as FSC-certified timber, are an excellent eco-conscious choice.

Ensure your slats are spaced no more than 2-3 inches apart for optimal support.

Adjustable Bases: The Future of Sleep Support

An adjustable base allows you to customize the angle of your head and feet, offering personalized support and pressure relief.

Opt for an adjustable base made from sustainably sourced materials and energy-efficient motors to keep your carbon footprint in check.

Platform Beds: Style Meets Sustainability

Platform beds are another fantastic alternative to box springs.

They offer sturdy support, ample storage space, and a sleek, modern look.

Keep your eyes peeled for platform beds made from eco-friendly materials like bamboo, reclaimed wood, or certified timber.

Or, follow my DIY guide and turn a regular bed frame into a platform bed.

Other DIY Solutions: Get Creative!

You can create an eco-friendly support system for your mattress using materials like milk crates, wooden pallets, or even cinder blocks.

Just ensure they're clean, safe, and offer even support for your mattress.

Warranty Woes: Tread Carefully

Before you go all in on plywood, it's essential to consider your mattress warranty.

Some manufacturers may void the warranty if you use plywood sheets instead of a box spring or their recommended foundation.

Be sure to check the fine print!

The Great Mattress Sag Mystery: Unraveling the Truth

Why do mattresses sag in the first place?

Let me unravel the mystery by exploring the factors contributing to mattress sagging and how to prevent them.

  • Age: Mattresses have a lifespan. Over time, materials break down, and the mattress loses its ability to provide support.
  • Wear and tear: Constant pressure from our bodies can cause the mattress materials to compress, leading to sagging.
  • Lack of proper support: A weak foundation (like an old box spring) can't provide adequate support, causing the mattress to sag.
  • Temperature and humidity: Extreme temperature changes and high humidity can affect the materials in your mattress, causing them to expand, contract, or deteriorate, resulting in sagging.
  • Poor manufacturing: Sometimes, it's just a case of bad craftsmanship. Low-quality materials or manufacturing defects can cause premature sagging.

Now that we know the culprits behind mattress sagging let's dive into some strategies to keep your sleep sanctuary in tip-top shape.

Rotate Regularly

Regularly rotating (and flipping if applicable) your mattress every few months helps distribute wear evenly and prevent sagging.

Most modern mattresses are one-sided and can be rotated but not flipped.

Check the manufacturer's guidelines if you're unsure.

Clean Regularly

Regularly cleaning your mattress (vacuuming, spot cleaning, and airing it out) can help maintain its integrity and prevent the buildup of dust, allergens, and moisture that could contribute to sagging.

Arabella has written excellent articles on cleaning memory foam mattresses and cleaning latex mattresses.

Invest in Quality

While it may cost more upfront, a well-made mattress is more resistant to sagging and can save you money in the long run.

My number one mattress shopping tip is to stretch your budget as far as possible.

Time for a New Mattress: Knowing When to Say Goodbye

As much as we'd like our mattresses to last forever, they do have an expiration date.

If your mattress is around 8-10 years old, it may be time to consider a new one.

Signs of a worn-out mattress include persistent discomfort, sagging, and visible wear and tear.

Frequently Asked Questions

How thick should my plywood be?

For optimal support, use plywood that's at least ¾" thick. Thinner plywood won't provide enough stability and could cause your mattress to sag even further.

Can firm pillows support a sagging mattress?

Yes, firm supportive pillows can be used as a temporary solution for a sagging mattress by filling the gaps and holding it tight in place with a mattress cover.

Is BC softwood plywood high-quality?

BC softwood plywood is high-quality and cost-effective, making it one of the best choices for mattress support.

Will plywood offer enough support for an old spring mattress?

Yes. A plywood board is supportive enough for spring mattresses.

The Final Word

When it comes to supporting your mattress, plywood can be an effective and budget-friendly solution.

Mattress toppers and slats made from sustainable sources can help provide extra support and improve air circulation around the bed.

Adjustable bases allow you to customize your sleep experience, while platform beds offer style and sustainability in one package.

If DIY is more your thing, consider using milk crates or wooden pallets for added support.

Before making any changes, however, check with the manufacturer, as some warranties may be voided if you don't use their specified foundations.

Finally, remember that mattresses do have an expiration date. If yours is past its prime, it might be time for a change!

With all these tips in mind, you should have no trouble finding an eco-friendly solution that fits your lifestyle and budget needs.

Get In Touch

Are you struggling to get your recommended sleep hours due to an old and unsupportive box spring? Are you a fan of box springs? Or is a platform bed or traditional bed frame more your thing? Do you have any additional tips for a good night's sleep? Drop me a line and let me know.

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James Miller
James Miller
James is an environmentalist, sustainability expert and senior editor at TheRoundup, specializing in testing non-toxic, organic and eco-friendly products. James, his wife and two daughters believe in chemical-free and zero-waste living. They aim to leave the planet in a better state than we found it, for future generations to enjoy.
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