Now it is time to put the mattress support(s) on the inner bed frame.
You will need two mattress supports for a queen or double size Murphy bed and one piece for a twin size.
We recommend 1/4″ plywood or Masonite, but any thin wood that is smooth would work.
The mattress support will let the mattress to slide easily and provides a good flat support for your mattress.
You will also need some wood screws according the construction guide to attach the mattress supports to the bed frame.