Can I put a box spring on top of slats?
Beside this, can you put a box spring on a slat bed?
In most cases, you do not need a box spring if you're using a bed with built-in wood slats, like those commonly used in a platform bed. However, some metal slat kits are designed to act as a bed frame and support for a box spring and mattress set.
Similarly, can I put a box spring on a platform bed?
Universal Compatibility. Every mattress and box spring should work on a platform bed, though box springs are not necessary like they are with normal beds.
Plywood. Lay a sheet of plywood down on the slats of your bed frame, and place the mattress on top of it. It will support the mattress from beneath, stopping it from sagging. If the issue is an older mattress, plywood can give you a temporary solution.