Hello all, new poster here and I really need help. In my last house I had two Breckwell inserts (P2000I and P23). When we moved I saved both stoves and now having purchased a new house I would like to use one of them. In my new house I have a firebox that the previous owners demolished the front of the hearth and closed in the box in the wall. I exposed the firebox itself and now am looking to build just a face that the insert will be set into. I have seen people build a box in a wall and ran a pellet stove however I cant find ANY information on R Value of what the stove sits on. Will I be able to get away with wood 2x6 construction holding up one or two layers of Durock and the stove sitting on that or do I need to frame in all metal studs 12 inches in either direction? Will one layer or Durock suffice or do I need two? There is NO information on this type of application that I can find.