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Also to know is, is it OK to put a box spring directly on the floor?
You could also set a box spring directly on the floor and place your mattress on top, but most often people choose to put a box spring on a metal bed frame in order to lift the sleeping area higher off the ground. This makes getting in and out of bed easier. It also creates a nice little storage space under the bed.
Secondly, what do you put under a box spring?
A thin layer of sheeting or cushion covers the box spring. You can find box springs made out of different type of materials, but the most durable one you will find has a wood box base. The benefits of a box spring are that they can provide more bounce, durability and height to your bed.
Steel Slats Used to Support Mattresses They are built to be placed underneath a box spring / foundation but not directly under a mattress. Steel slats are so strong it is common to only need 3 or 4 to get the job done and support a foundation / box spring.