Greetings from Asia's wild West
Just finished our 3rd RMH experiment (2 8" systems and 1 4" system in a yurt) before the winter gets started. I've made several small adaptations from Ianto's book for using locally available materials and burning coal (thank you Wisners!), but my one MAIN question at this point is:
What could be a good non-manufactured substitute for perlite/vermiculite as the heat riser's insulation?!
In the first two I used coal dust with a clay slip (packed into a sheet metal sleeve around the brick riser, which I left in), and in the 3rd we got a pick-up load of "slag" from the local heating plant - broke up the lighter stuff and packed it in the same way. Any thoughts on which is better, what else might work, or if I should just try to import something fancier?
