An attempt was made to improve the conventional technology in terms of both materials and construction methods with the aim of saving the fire-resistant covering work using the winding type fire-proofing covering materials for steel beams. Specifically, we examined the effective use of the heat capacity of steel beams, the thickening of only the lower flange covering, and the densification of heat-resistant rock wool. As a result, it was confirmed that the thinning of heat-resistant rock wool by increasing the density was the simplest and most effective from the viewpoint of fire resistance and labor saving.
