I am planning an outdoor installation of a modular WFO which will weigh less than 1,000 lb. The oven will be next to an elevated deck, and the base will sit about 10 feet off the ground. I'd like to avoid the traditional method of pouring a concrete base, building up with concrete block, then pouring another concrete base for the oven. The site is remote, and everything would have to be hauled in and mixed by hand. It would be far easier to build a base from framing lumber, say 6" x 6" posts 0n concrete bases, and 4" x 8" beams under the oven. Assuming it was engineered properly, it would hold many times the weight of the oven.
I'd love to hear from anyone who may have done this. The main question is how to finish the top of the tower. What should the modular oven rest on? Assuming I build a solid deck of 2" x lumber on top of the beams, could I just put down 2" or 3" of insulating board on my wood top, and assemble the oven directly on it? Is there any fire hazard? Is there any issue with loss of heat out the bottom of the oven?