I am building an earthen floor RMH. What are my options for insulating the mass from Mother Earth on the cheap? Foam? Can it handle the heat? Sawdust?? Air space? Is heat loss to Mother so great that she steals the heat continuously or would she eventually warm up to be a helpful heat sink and return heat to me? Perimeter Insulation? Infloor exhaust pipes combined cross sectional total should have same cross sectional areas as heat riser ect? I am thinking of more than one exhaust pipe. I am located in the windy wet PNW coast of Canada. Oh boy! the questions keep coming!!
