I am just about ready to start building my WFO. I am not sure if I have the right amount (or ratio) of ceiling / floor mass and insulation. I have attached a file that shows my current plan... Anyy comments appreciated. I also have a few specific questions
1. Leca is a very cheap insulating material based on clay. λ = 0,079 to 0,12 W / mK (compared to Perlite which has a value of λ = 0,045 to 0,060 W / mK). Perlite is not readily available so thats why I am asking... Is Leca good enough or do I need to find Vermaculite or Perlite to fill the void around the oven?
2. The brick frame will be square and the dome of course circular. In the narrowest sections the distance from the dome to the brick wall is only 3-4". I plan to fill this section with multiple layers of the same insulating material that I will apply in two layers over the dome. Good enough or do I need a larger footprint to get more insulation in here?
3. Should I be concerned with the floor / ceiling mass and insulation ratios?