Many kinds of components, materials and building systems are changing according to the alteration of building systems due to several reasons. However, the changes of ordinary components are rarely recorded in detail. In this study, we grasped the outline of development of sound proofing, especially corresponding with reflection of sound transmitting in the air. In Japan, it is in the 1920s that sound absorbing materials began to be used. At first, there was much what was made for organic fiber. However, they are easy to burn and deficient for absorbing sound, inorganic fiber material came to be used.
