Day four was a quick, 3-hour work day. Concrete was mixed and poured into the block voids and slab form. At this point had hadn't decided if I should go with ceramic board or vermiculite concrete for the insulating layer. The surface was left rough for application of another layer if needed. The finished slab is 56" square and about 4" thick over the block and 3.5" over the span.. The target is to get the oven floor to 40" above the patio; the existing block base is 32 inches, the slab adds 4 inches, the insulation layer will be 1.5 inches thick and the bricks are 2.5 inches thick. That adds up to 40 inches -- right on target!
I eased all of the edges of the slab -- this isn't really necessary, as this is going to be covered with other materials eventually -- but it's a very satisfying task.
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