Going to go with the 1" protected/insulated wall design behind new Castine install to keep clearances down. Planning to put cement board on wall studs (not needed for specs) will then add a 1" spacer of some type (thinking ceramic spacer) then another cement board with a stone veneer to finsih. This will be a corner of room install. I am building a hearth out of 2x10's and will put a 1" flag stone on top of that that the stove will sit on. I understand that a 1" gap will be needed on all sides (bottom, sides and top - can't do corner). Looking locally for 1" ceramic spacers (Home Depot, Lowes, True Value) but no luck. Stove shop sells them but they are an hour away but at least available. Questions: 1. Anyone have a better idea? Maybe using a 1" piece of steel or alum. square stock will be easier to install and will give plenty of screwing surface for cement board that stone will be mounted on. 2. Anyone have another place to look for these? 3. If using these spacers, I will be putting these on my 16" on center studs from top of hearth to my mantle, what spacing should I use between each spacer going up and down stud?