Im building a RMH for the first time. I live in rural northern India and finding any type of building materials here is a challenge. I am wondering if there is any other way to insulate the heat riser than to use oerlite, pumice, etc. WE do have lots of clay soil though. Is is possible to use any type of vegetative material covered with clay slip? such as cron husk, paper, bamboo. etc? . Glass bottles covered with clay? What about long thin glass strips? An engineer visiting from the city gave me a sheet of 1/4 inch Nitryle rubber foam that they claim is used for insulating rockets. I have no idea what this is really. Could this be used as the outer layer of the insulation, with a clay wood chip mixture inside? Just trying to find a solution in a difficult place.
Getting ducts is another problem. Straight lengths are easy, but t's elbows etc are not. The local metal fabricators can make straight pieces easily but not bends and angles. Again someone suggested that in the city we can get flexible lightweight duct. Is this suitable if I can obtain it?
Trying to assemble materials here for any project is always difficult. We must think very simply. Any suggestions are welcome.
spero
PS. Ive searched for the answer but cant find it, if it has been given before my apologies.