I'm about to install my first insert. I have a cultured stone fireplace surround. I believe the cultured stone was installed on 1/2'' sheet rock with wire lathe. In the past if I burnt a hot fire for 8 to 10 hours the stones just above the fireplace opening got pretty warm. Do I have an issue with the stone over heating the dry wall directly above the insert? Thanks for all the help this site can literally be a life saver. Ken