dave marth wrote:Satamax,
Not sure what you meant by this paragraph.
"Dave, heavy dense firebricks is what was used at the begining of rocket mass heaters, and then the insulation was lousy! And they worked, may be not testo sniffing performance, but well enough."
What do you mean the insulation was lousy?
And Big Al, no problem, glad you caught that though. I may just drop the whole burn box in another box of perlite. I'll still brainstorm insulating the riser firebricks.
dave marth wrote:I heard terracotta chimney liner can Crack easily with the heat. How about the recipe of 4:1 perlite to furnace cement? Anyone ever try that formula?