I am off to a non-re-treatable start. I am building a 36" Pompeii in the corner of our kitchen. The kitchen is on the second floor. I channeled out a 5" deep ledge into the wall to carry the mass of the oven in the corner. The chimney which extends to footings some 14' feet below also helps carry some of the load. The front of the oven is slightly cantilevered over a 5" steel I Beam which is planted on the 2 concrete posts which extend down to a the bond beam that caps the first floor walls and carries the second floor walls and part of the roof load. The first floor walls are 14" thick. I placed the 4" reinforces structural slab on corrugated tin roofing and used the extra roofing material to form the irregular front of the slab. I tried using masonite, but some of my bends were a little tight. The next phase is to poor the insulated slab. I plan on using a mix of perlite and Portland Type II mixed 8:1. It will be 4" thick. I have some mineral wool on hand and was wondering if it would be advisable or not to place it between the structural slab and the insulated slab as a thermo break. I am trying to build this project with minimal cost and am not totally convinced that using the FB insulation on the bottom buys me much since I can get Perlite fairly inexpensively locally. Any comments?
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