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Blog Lux Comfort

Plywood Under Mattress: Enhancing Comfort and Support

From the Puffy Editorial Team | 5 min read.
Plywood Under Mattress: Enhancing Comfort and Support

Finding the right setup for a comfortable and supportive sleep isn’t just about selecting the perfect mattress; it’s also about understanding what lies beneath. One often overlooked yet highly effective solution is the use of plywood under the mattress.

This blog explores the benefits, practicalities, and considerations of this approach, helping you decide if it’s the right choice for your bedding needs.

Can I Use Plywood Under My Mattress?

The Simple Answer: Yes

Using plywood under your mattress is a viable option, particularly if you have an older bed base or a slatted frame with wide gaps. Plywood offers a solid, even surface, preventing your mattress from sagging and extending its life.

Does Putting Plywood Under a Mattress Make It Firmer?

Understanding the Impact on Firmness

Indeed, adding plywood beneath your mattress can enhance its firmness. Plywood provides a sturdy, flat surface, preventing the mattress from bending or losing shape, which can be a boon for those preferring a firmer sleeping surface.

Many people wonder if adding plywood beneath their mattress can actually change the firmness level of their bed. The answer is a definitive yes. Plywood provides a sturdy, flat surface that affects the overall feel and support of your mattress. Here’s an in-depth look at how plywood can make your mattress feel firmer:

Increased Support

  • Uniform Surface: Plywood offers a consistent, solid base. This uniformity prevents the mattress from bending or dipping in areas where support might be lacking, particularly in older bed frames or those with wide slats.
  • Prevention of Sagging: Over time, mattresses can start to sag, especially in the middle. Placing plywood underneath counteracts this sagging, maintaining a level surface and, consequently, a firmer feel.

Impact on Different Mattress Types

  • Memory Foam and Latex Mattresses: These types of mattresses conform to your body’s shape. Without proper support, they can feel too soft, as they sink into gaps between slats or an unsupportive base. Plywood provides the needed flat surface to maintain the inherent firmness of these mattresses.
  • Innerspring Mattresses: While innerspring mattresses are generally firmer, older innerspring beds can benefit from plywood support. It prevents the springs from over-flexing, which can contribute to a firmer feel.

Enhanced Durability

  • Even Wear: Plywood support ensures that your mattress wears evenly. Without it, certain areas of the mattress bear more weight than others, leading to uneven firmness over time.
  • Longevity: By preventing sagging and uneven wear, plywood can extend the life of your mattress, maintaining its firmness for a longer period.

For those using memory foam mattresses like Puffy Cloud Mattress, adding plywood underneath can complement the mattress’s contouring and supportive features, ensuring a firmer feel without compromising comfort.

Should I Put Plywood Under My Mattress?

Assessing Your Needs

The decision to use plywood under your mattress should be based on your specific requirements. If your mattress tends to sag or if your bed frame lacks adequate support, plywood can be an effective solution. However, it’s crucial to consider factors like ventilation to prevent moisture accumulation.

Interested in how Puffy stacks up against other brands? Check out our mattress comparisons: Puffy vs Purple, Puffy vs Nectar, Puffy vs Casper, Puffy vs Leesa, Puffy vs Saatva, Puffy vs DreamCloud, and Puffy vs Tuft and Needle.

Plywood for Mattress Support

A Solid Choice for Various Mattresses

Using plywood for mattress support is particularly beneficial for:

  • Enhancing the structural integrity of your mattress
  • Providing a flat, uniform support surface
  • Preventing sagging and uneven wear

How Thick Should Plywood Be Under a Mattress?

Optimal Thickness for Support

The ideal thickness of plywood for under-mattress support generally ranges from 0.5 to 0.75 inches. This thickness offers sufficient support without being overly cumbersome or heavy.

How to Make Mattress Firmer with Plywood

A Step-by-Step Guide

  1. Measure Your Mattress: Accurately measure your mattress to ensure the plywood fits perfectly without overhanging.

  2. Select Quality Plywood: Choose smooth, ½ to ¾ inch thick plywood. Avoid plywood with splinters or rough edges.

  3. Cut to Size: If necessary, cut the plywood to match the dimensions of your mattress. Sand down rough edges after cutting.

  4. Position the Plywood: Place the plywood between the mattress and the bed frame or box spring, aligning it carefully with the mattress.

  5. Test the Firmness: Lie down on the mattress to feel the increased support and firmness.

  6. Optional Ventilation: For foam mattresses, consider drilling small holes in the plywood for better air circulation.

Following these steps can effectively make your mattress firmer, providing enhanced support and a more comfortable sleep experience.

Check out Puffy mattress reviews from real customers and see how we compare with other brands.

Additional Plywood Benefits and Considerations

Elevating Your Sleep Experience

  • Improved Airflow: Plywood can raise your mattress slightly, enhancing air circulation and reducing moisture and mildew risk.
  • Budget-Friendly: Plywood is an affordable way to modify your bed setup effectively.
  • Custom Fit: You can easily cut plywood to match any bed size.

Plywood for Specific Mattress Types

Memory Foam Mattresses

For memory foam mattresses, which require solid support, plywood can prevent them from losing shape and promote even wear.

Innerspring Mattresses

Even though innerspring mattresses are typically firmer, adding plywood can bolster support, especially in older beds with weakened springs.

Comparing Plywood and Box Springs

Box springs provide a bouncy, cushioned base, while plywood offers firmer and more uniform support. The choice depends on personal preference and mattress type.

Pairing plywood with a high-quality mattress like Puffy Lux Mattress can significantly enhance your sleep by providing additional support and extending the mattress’s lifespan.

Use our store locator to find the closest furniture or mattress store near you and feel the cloudlike comfort of our Puffy Mattress in person.


Incorporating plywood under your mattress is a straightforward yet impactful way to boost comfort and support. Whether you’re aiming to firm up a too-soft mattress, prolong its lifespan, or achieve uniform support, plywood proves to be a practical and efficient solution. Remember to account for factors such as thickness, air circulation, and the type of bed you have for the best results.

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