what are bunkie boards used for
Bunkie boards (aka bunk boards) are the flat inserts that sit on the bed frame under the mattress to hold the mattress up. They are our preferred substitute for what the mattress stores sell -- a shallow box spring which can sell for up to $60- $70 each.
Bunky (or bunkie) boards are cloth-covered pallets that provide a solid foundation in lieu of a box spring or base.