Hello there folks, so today I took the day to go for a drive to the local stone supplier to get this project started! I was pleased with the massive selection he had, I had intended on just buying some flagstone and doing the project! However I was sent there by the fireplace people who are installing my stove and the stone guy showed me some stuff that the fireplace company buys for there pads! So black limestone is what I ended up getting! Looks real nice! So now the next step is to get cutting and lay it all out! I have the raised pad already framed with 2x4's on there side framed all up on 12" centers, and blocked up really well,topped off with 3/4" forming plywood! So once I'm ready to set the stone all in place what mortar/ thinset should I be using? Can I just lay it right on the plywood! I see some people use durrock then lay! I was told you could get special stuff to bond to plywood or just use steel lathe on top of the plywood! Also what should I use to make my "grout" joints In between stones! Also what did everyone else use for a stone sealer if anyone used one at all?