Items such as large plates benefit by being in the center of the shelf for even heating. This helps reduce warpage.
Plates fired on edges may be supported at the bottom with large spur stilts which can also be used to separate adjoining plates. Tall posts can be used to separate plates from the walls.
Plate holders insure even firing of china painted plates
Larger pieces that take all of the kiln dimensions should be placed so that the projecting edges are between coils.
Glazed pieces may be prevented from sticking to the bottom of the kiln if you remove the glaze. This is called ‘dry footing'.