Grouting
The process of pouring a thin mixture of kaolin or fire-clay betwixt the cupola shell and the fire-bricks, as well as at the joints of the bricks, during the operation of lining. By building the bricks in as close contact with the shell as possible and filling the remaining spaces with the grout, the brick is permanently fixed, and all possibility of air escaping through the joints of the shell obviated. See CUPOLA; REPAIRING THE CUPOLA.