I'm recreating the original constructional hearth ready for new fireplace and hearth. The last brick course of the CH is a joist depth below floor height. I intend to form the dims of the new superimposed hearth (smaller than CH) and ballast and concrete to floor level (or how much below?)
How thick should the concrete be? Don't want to make thicker than it need be
1" or 2"?Any other advice?
TIA