Robert Johnson wrote:I was planning on cutting a couple 55 gal barrels in half long ways and filling with perlite to set the rmh on and everything will be set on concrete blocks. Everything will be centered on the house support frames. I'll have corrugated steel covering the walls behind it to reflect the heat into the room. Those will be mounted on 2x4's screwed into the studs and rock wool between the wall and steel. I'll add one barrel of mass at a time to see how much mass I actually need as my house isn't that big.