Snooze Blog

Box Spring Vs Slats. What's The Difference?

Written by National Mattress Canada | June 27, 2025 2:00:00 Z PM

If you're shopping for a new bed or looking to enhance the support of your current mattress, you might be considering a box spring or slats. But which one is the better choice? Both options have their own advantages and drawbacks, so understanding how they work can help you make the best decision for your comfort and needs.

 

What is a Box Spring?

A box spring is a sturdy foundation that provides support for your mattress. Traditionally made with a wooden or metal frame and covered with fabric, older box springs contained actual springs inside for added bounce. However, modern box springs are often hollow, offering firm and stable support without internal springs.

Box springs are commonly placed on a bed frame and secured in place to prevent shifting. Some people also choose to place them directly on the floor or atop an existing bed base. A box spring’s primary function is to provide a strong, even foundation, which can help extend the life of your mattress.

Pros of a Box Spring:

  • Elevates your mattress – Adds height, making it easier to get in and out of bed.

  • Improves mattress longevity – Prevents excessive sagging by offering even support.

  • Cost-effective solution – A box spring can enhance the support of your mattress without needing a new bed frame.

  • Reduces strain on joints and muscles – Especially helpful for individuals with back pain or mobility challenges.

Cons of a Box Spring:

  • Bulky and heavy – Can be difficult to move or transport, especially during a move.

  • Limited under-bed storage – Unlike slats, a box spring takes up more space and may not leave much room for storage beneath the bed.

  • Assembly required – Some box springs require installation, which may take additional time and effort.

 

What Are Slats?

Slats are horizontal beams, typically made of wood or metal, that provide a mattress foundation within a bed frame. They are placed a few inches apart and can either be rigid (flat and firm) or sprung (slightly curved for added flexibility).

Slats work well for people who prefer either a firmer sleep surface or a bit more flexibility, depending on the type they choose. Standard slats offer solid, even support, while sprung slats provide more bounce and contouring.

Pros of Slats:

  • Better air circulation – Gaps between slats promote airflow, reducing heat buildup while sleeping.

  • Lightweight and easy to install – Slats are typically easier to assemble and move compared to box springs.

  • Cost-effective option – Often more affordable than box springs, especially for platform beds.

  • Aesthetic appeal – Slats are hidden within the bed frame, giving a more minimalist look.

Cons of Slats:

  • Potential sagging – If slats are spaced too far apart, some mattress types (like memory foam) can sink through over time, reducing support and durability.

  • Requires secure installation – If slats shift or become loose, they can cause an uneven sleeping surface and potential discomfort.

  • Not ideal for all mattress types – Heavier mattresses may not perform as well on slats unless they are reinforced.

 

Can You Use Both a Box Spring and Slats?

While it’s generally unnecessary to use both, certain situations may call for an extra layer of support. If your mattress lacks proper reinforcement on slats, you could place a thin plywood board over them for added stability. However, stacking a box spring on slats is not recommended as it may compromise structural integrity and lead to excessive height.

 

Choosing Between a Box Spring and Slats

  • Mattress type – Check your mattress manufacturer’s recommendations to see which foundation is best suited.

  • Personal preference – Do you prefer a firmer or softer sleep surface?

  • Room aesthetics and storage – If under-bed storage is a priority, slats might be the better choice.

  • Ease of assembly and mobility – If you move frequently or need an easy setup, slats are generally more convenient.

 

Final Thoughts

Both box springs and slats play a crucial role in ensuring a comfortable and supportive sleep environment. Box springs offer a sturdy, elevated foundation, while slats provide breathability and flexibility. Ultimately, your choice should be based on your mattress type, sleep preference, and bedroom setup.

If you're still unsure which option is best for you, consult a mattress professional to get expert recommendations based on your specific needs. Investing in the right foundation will not only improve your sleep but also extend the life of your mattress!