The average age of residential houses in Taiwan is as high as 32 years, and the total number of old houses in Taiwan has exceeded 4.5 million. Most of these old houses are made of reinforced brick or reinforced concrete, with a ratio of 51.1%. The early concrete buildings have gradually become old and It will increase year by year. At present, the biggest problem in buildings is leaking wall cancer. At the same time, the problem of water leakage in existing houses has been the first place in real estate transaction disputes for many years. Therefore, whether it is a new or old building, house leakage is a big problem for buildings. question.