Abstract: The supporting structure of a technical installation made from a material that is not resistant to corrosion and whose inner wall at least temporarily contains a corrosive and abrasive gas-vapor mixture and is protected from acid corrosion by a gas-vapor mixture barrier. This barrier is either placed between a refractory coating (6) and a thermal insulating layer (7) or is integrated into the refractory layer (6) or in the thermal insulating layer (7). The mechanical protection from the permeation of the gas-vapor mixture though the thermal insulation (7) up to the inner wall of the supporting structure allows a thermal insulating material to be selected that has a distinctly reduced thermal conductivity and thus allows the temperature on the exterior of the supporting structure to be lowered reducing energy consumption and improving occupational safety.