a coolable arched roof for a high - temperature melting furnace having a furnace interior . at least the following layers are present on that side of a layer of refractory bricks , which is remote from the furnace interior : a sealing layer , which is used to seal the furnace interior against the leakage or penetration of gas ; an insulation layer having a thermally insulating action ; and a cooling layer , which is designed to carry a cooling fluid . the arrangement of layers results in an increased gastightness and prevents premature aging of the refractory bricks .