Bunkie boards are available in the same size as mattresses. The bunkie board (also known as Bunky Board) is constructed with solid plywood, metal or wooden slats, covered in fabric. The fabric is generally in a muted, flat color since the foundation is at the bottom of the bed. The thickness of each bunkie board is 1.5″ to 2 inches. The dimensions of each board are designed to fit platform beds, twin daybeds, metal bed frames, twin, full, and queen bunk beds.