Hi! My husband and I have decided to try to build a Rocket Mass Heater and we don't have a clue!!! We are not very good with building anything at all but our wood burning stove did not do a good job this winter and we are tired of being cold! So we want to spend this summer getting one built and ready for next winter. My husband has been watching video after video and reading anything he finds about these heaters but still we have not found the answer to the start... What do we need to put on the floor? Like under the pipes? Here's what I have going on in my house... I live in a old church that we are SLOWLY turning into our home, It is four feet off the ground the floor is a little old and weak... There is the plywood subflooring then carpet pad and carpet (which we want to tear out) I know we need to sturdy up the floor inside and out and we know what to do for that but after I get rid of the carpet and pad and there's just the plywood what type of material do I lay on top of that to be safe? I was wondering about cement board? Fire bricks? Please help.
