It goes without saying that waterproofing work is one of the most important works in architecture. In today's world where reinforced concrete non-combustible buildings are increasing, waterproofing work is one of the most difficult works, and everyone involved in construction must admit it. As a result of thinking only to prevent rain and dew as the first principle of building a house in ancient times, what was a long-sloping roof form has reached modern times, and the tendency to use a flat roof is economically or fire-preventive. It is increasing year by year for the reason. Waterproofing work has become more and more important here, and the use of underground is increasing in urban areas, which also results in the increasing importance of waterproofing work. Even in the construction of sloped roofs, those suffering from rain leaks are in a state where waterproofing work must be given particular importance when it comes to taking basements and making flat roofs. However, recently, waterproof materials, construction, and structures have become diversified, and it is very difficult to select the right material and construction method in the right place. Many of the lectures and books by the late Professor Toji Yoshida, a professor at Waseda University and a doctor of engineering, on asphalt waterproofing work for more than 20 years still serve as a standard reference for selecting materials and construction methods related to waterproofing. According to this, we are convinced that our copper waterproof band, OAM asphalt compound, copatite, Okuyama type thermal method and normal temperature method integrated waterproof layer constructed by applying river sand are the closest to the ideal. ■ Click here for technical introduction of Okuyama Kagyo ■ Click here for Okuyama Kagyo's construction results and personal menu 8-4-9 Ginza, Chuo-ku, Tokyo 1040061 Copyright (c) 2010 OKUYAMA KAKOGYO CO., LTD. All Rights Reserved