A bunkie board is thin

mattress A mattress is a large, usually rectangular pad for supporting a lying person. It is designed to be used as a bed, or on a bed frame as part of a bed. Mattresses may consist of a quilted or similarly fastened case, usually of heavy cloth, conta ...

support originally intended for a

bunk bed A bunk bed is a type of bed in which one bed frame is stacked on top of another, allowing two or more beds to occupy the floor space usually required by just one. They are commonly seen on ships, in the military, and in hostels, Dormitory, dor ...

. It was invented in the early 20th century to provide a thinner platform support than box-springs, and more uniform support than slats.

Construction

A DIY bunkie board might consist of plywood, but commercially-made versions can be made of wood or metal, and are often covered in fabric.

References

Bedding Furniture {{furniture-stub