A variable modular support system for use in a kiln, as well as a method of constructing such a support system in a kiln, comprises plurality of refractory blocks each having an upper surface and a lower surface and at least one transverse recess in either the upper or lower surface, the plurality of refractory blocks comprising a first base refractory block and a second base refractory block spaced from the first refractory block by a variable and selectable distance. Connecting rods extend from the recess of the first base refractory block or a refractory block stacked thereon to the recess of the second base refractory block or a refractory block stacked thereon, the connecting rods forming a rack or shelf located between the first base refractory block and the second base refractory block.