Hey all! I'm looking for a little direction regarding building my own Type 2 UL1618 hearth with pedestal. I've been told to just stick a couple layers of 1/2" durock on top of plywood and tile over the top... is that sufficient? Others have mentioned adding 1/2" MICORE 300 and/or sheet metal? I'm sure plenty of people here have plenty of experience doing this themselves... anyone out there able to help me out? What materials should I use and how should I stack them to achieve sufficient coverage?