Hello. I live in a condo and have recently removed the old carpet in order to install radiant heating and either a tile or wood floor. Before installing the heating element and tiling. I would like to put down a sound absorbing underlay such as rubber or similar product then cover with a layer of plywood and then continue with the heating element and tile on top. Does this make sense? I don't have a construction background. Any suggestions or insight into products would be much appreciated.