I was thinking about putting Durock up my wall above my fireplace. I noticed the sheet rock above my stove gets pretty hot above my hearth-mount stove. To hot to touch it. I have been reading that Durock isn't as heat resistant as it was/or could lead to gasses being emitted. I want to do some tile work around the stove and also put a wood beam mantle a little higher up the wall away from the heat... Could Durock work in this situation or should I leave it alone? I attached a pic of the wall.