1. First of all, we must find out who this management responsibility belongs to. Public facilities shall be paid from the maintenance fund by the property; Non-public facilities depend on whether they are exclusive or * * *. If there is an agreement between the parties, such agreement shall prevail. If there is no agreement, the owner of the proprietary part shall be responsible for the management and maintenance. However, there is controversy about who is responsible for the management and maintenance of some parts of * * *. If the waterproof layer has facilities as * * *, as it belongs to concealed works, it is generally believed that the upstairs residents, as the actual users, should bear the behavior obligation of reasonable use, and the downstairs residents, as the beneficiaries, also have corresponding obligations, mainly reflected in the cost commitment.

2. Developer's responsibility: During the warranty period, the developer shall take full responsibility for water leakage caused by non-human reasons. According to Item (2) of Article 1, Article 7 of the Measures for Quality Assurance of Building Engineering, it covers the roof waterproof project, the leakage prevention of toilets, rooms and external walls with waterproof requirements. The installation of electrical pipes, water supply and drainage pipes and equipment in Item (4) is two years, counting from the date when the project is completed and accepted.

3. Fair liability: for the house that has passed the warranty period, the parties are not at fault (or there is no evidence to prove that they are at fault). If the waterproof layer naturally ages, the maintenance cost at this time will be shared by the parties according to the provisions of Mintong 132 and the realization situation, generally half for one person.

4. Responsibility of the property: The water leakage is definitely not caused by the property, but if the property is neglected in management, or problems are not handled in time, resulting in increased losses or more serious problems, then the property should bear the responsibility. The former, such as pipeline blockage, is not caused by the property, but according to the property management contract and relevant regulations, the property company should regularly check and clean up, and if it fails to do so, the property responsibility can be investigated; The latter, such as illegal decoration upstairs, the property has not been stopped, then you can find the property to claim compensation for losses.