Calculation method of public maintenance fund: 1. For commercial companies, the quality guarantee period of roof waterproof layer is 5 years, and it is the developer's responsibility to leak water on the top floor of the purchased building during the waterproof guarantee period. Developers are obliged to repair for free, and must contact the developers for immediate repair as soon as possible. 2. The current storage standard for the first-phase special maintenance fund of public maintenance fund is 90 yuan/m2 for high-rise buildings (including multi-storey buildings with elevators). Multi-storey (including villas) 50 yuan /m2. Measures for the administration of special maintenance funds for Huainan property seventh