Abstract
The purpose of this research is to gain a standard of repair, suitable periods and rates for intended repair. At first, as I must know how wearing of buildings change with age or etc., I investigated several researches about wearing of every part of buildings : that is, 1) Research on the Wear of buildings. 2) On the Wear of Asphalt-Built up Roofs. 3) Research on Wearing of Steel Sash. 4) Research on Wearing of the Former Osaka. Central Telegraph Office Building Then, I applied the economical theory of facilities investment and calculated the economical repair time. At last, from those practical researches and economical calculations, I gained the standard of suitable repair periods and rates of every building part and every finishing.
