What should I do if the roof in Guangzhou cracks and leaks?

Because the roof of the building is exposed all the year round, it is easy to leak due to external factors such as wind, sun and snow, which leads to the paint layer on the roof of the building falling off, moldy or the ceiling leaking; The wall surface flows from top to bottom (this phenomenon may also be the leakage of the external wall), or the coating layer falls off and becomes moldy. Generally speaking, roof leakage is caused by the following reasons: 1, roof cast-in-place slab cracking caused by improper construction and other factors; 2. The roof is not waterproof or the original waterproof layer has failed; 3. Human factors; 4. Quality defects caused by force majeure. In order to let people know more about the causes of roof leakage, Kangbao Building Materials listed the following roof structures from bottom to top (note: the roof structures I listed are only common practices, which does not mean that all roof structures are like this): 1, concrete slab, also known as cast-in-place slab, structural slab, roof slab, etc. 2. Waterproof layer. Including base treatment, coating waterproofing and coiled material waterproofing. 3. Insulation layer. 4. Isolation layer. 5. protective layer. 6. Non-slip floor tiles. In addition, the state clearly stipulates that the leakage prevention of roof waterproofing works, toilets, rooms and external walls with waterproof requirements is 5 years. If there are quality defects in the housing construction project during the warranty period, the construction unit or the owner of the housing construction shall issue a warranty notice to the construction unit. After receiving the warranty notice, the construction unit shall go to the site to check the situation and guarantee it within the time specified in the warranty. In case of emergency repair accident involving structural safety or seriously affecting the use function, the construction unit shall immediately arrive at the scene for emergency repair after receiving the warranty notice.