Hey guys I 'am fixing to start working on my hearth pad , I plan on using slate tile and cement backer board. How thick should i build my hearth pad, It will be a corner insatllation. should I frame up with studs and layer of plywood then put down my backer board and tile or just screw my backer board to my existing floor. does my corner walls have to be tile for the alderlea T6 any information you could share with me would be of a great help.