We set the (8" x8"x 16") concrete blocks in mortar. They go around 3 sides, with the chimney at the back. The walls of the kiln will be built on top of these. We were careful to level each block, and allow a brick width of space between the top of each block, and the middle layer of soft brick, to create the lower ledge for the car to slide along. The accuracy of this is vital to building a straight, tightly sealed kiln.
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