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A foundation or box spring supports your mattress, while a bed frame is the outer structure that holds everything in place and defines your bed’s style. Many foundations fit inside bed frames; some platform beds combine both into one.

It depends on your mattress and setup:

• Foam, latex, and hybrid mattresses: Need a firm, solid, or slatted foundation.
  
• Innerspring mattresses: May work with a traditional box spring or a solid foundation.
  
• Adjustable bases: Replace the need for a foundation altogether.

Not always. Platform beds often include built-in slats or panels that replace a separate foundation. Metal frames and upholstered frames usually need one, while adjustable bases act as both in a single piece.

An adjustable base lets you customize your sleeping position at the touch of a button—raising your head, legs, or both for better comfort, reduced snoring, and improved circulation. It replaces a box spring or foundation entirely and pairs beautifully with most foam or hybrid mattresses.

A Euro-slat foundation (also called a European-style slat base) uses flexible wooden slats that curve slightly upward to contour to your body and mattress. Unlike a solid foundation, these slats provide gentle give and enhanced airflow under the mattress. This design offers adaptive support and helps extend mattress life by reducing moisture buildup.

Euro-slat foundations are a great match for foam, latex, and hybrid mattresses, and they’re often found on adjustable bases or platform-style beds. If you prefer a little flex rather than a completely solid feel, a Euro-slat foundation can be an excellent choice.

A Bunkie board is a thin, solid platform—typically made of wood, metal, or plywood and covered in fabric—designed to provide a flat, supportive surface beneath your mattress. Originally created for bunk beds (where box springs wouldn’t fit), they’re now commonly used with platform beds, daybeds, and trundle beds to add extra firmness and stability.

If your bed frame has widely spaced slats or you want to lower your bed height, a Bunkie board can help create even support—especially important for foam or hybrid mattresses that require a solid surface.

Note: You do not need a Bunkie board with an adjustable base. Adjustable bases already act as the foundation, and adding a Bunkie board can interfere with the base’s movement and functionality.

If you prefer a lower bed height or have limited space, a Bunkie board can replace a standard foundation while still giving your mattress the support it needs.

No — adjustable bases act as both the support system and the foundation for your mattress. You don’t need a separate box spring or foundation underneath. Just make sure your mattress is adjustable-base compatible (most foam, latex, and hybrid models are).

Usually yes, as long as your frame has enough clearance. Many adjustable bases are designed to fit inside decorative headboards and footboards once slats or center rails are removed. Always measure first to ensure compatibility.

The right foundation keeps your mattress level and prevents sagging, helping it last years longer. An unsupportive base can cause uneven wear and may even void your mattress warranty.