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Abstract
Roof Cleaning is one of the means adopted by different steel plants throughout the world for increasing the roof life of open hearth furnaces. With the adoption of basic roof in TISCO, it was observed that the roof was getting over-heated and the tabs holding the bricks were getting cut. This resulted in premature failure of roof requiring frequent hot repairs. It was presumed that the dust accumulation in the roof was acting as insulation altering the thermal gradient and enhancing the liquid migration deeper in the brick. Laboratory investigation confirmed this assumption. In TISCO, roof cleaning has been undertaken regularly to overcome this problem which has resulted in improving the roof life considerably. The practice has been extended to the silica roof also with considerable success.