Okay, I've almost finished welding the combustion chamber to the charcoal chamber, now I face a new question : How thick to make the insulation ? To save money I'm considering making 1" / 25mm kaowool and 4-6 inches of rockwool on top of that, should i use more insulation ? I just need enough to keep the retort/oven around 5-600 centigrade for making charcoal. So what do you say ? Should I use more thank 4-6 inches ontop of the kaowool ? To keep it from caving in or bulge I've installed 3 cross bars in the tank to keep the sides together. Should I use firebricks instead?
Bear with me, the contraption isn't pretty - but hopefully it works