Greetings from Vermont. I have been reading these forums since January and am now ready to have our Hearthstone Heritage installed in front of our existing brick fireplace, in our 1965 home. The hearth is flush, but needs a 1.2 r-value. I pulled up the corner 1/4" slate tile to find 1/2" cement board over the plywood. I would like to remove the cement board, put 1/2" Micore down (we are blessed to have a local dealer in our town!) and wondered if I could re-use the cement board over top, or if I should replace it with new. Either way, that will mean that with 1/4" tile, I will have a 1/2" - 3/4" rise above the wood floor. So my questions are: Can the cement board be reused (then I don't have to deal with trying to cut a new piece to fit into recess over micore)??? And if not, could we use 1/4" cement board over the micore, which will make it flush with wood floor, then only a 1/4" rise when tile is installed? Or, should we use new 1/2" cement board so we don't run into rigidity issues for the new 1/4" ceramic tiles? I have read that 1/4" cement board has a .1 r-value, so that will meet requirement. I apologize for all the newbie questions, but if I ever want to sleep soundly with the woodstove going, I just have to know my options for our specific situation We live in a very wooded setting (free wood!) and want to significantly reduce our heating bill. Thank you in advance! If I have missed a thread that covers these specifics, please let me know!