Ask for help from professionals: the top floor, kitchen flue and rainwater pipe will drip when it rains, regardless of the property or upstairs. Who is in charge, can you block or lead at home?

Property over five years is definitely not guaranteed, and waterproof is generally guaranteed for two years. If the external wall leaks, you can only find the property to coordinate or do it yourself or be waterproof at that position. In addition, look at this location upstairs and see if there are any structural changes. If you can prove that his house is like this, you can explain that there is a part of water leaking upstairs, so the upstairs will also help you bear part of it. There is nothing good about other methods, mainly because it takes a long time.