How to write to the property management company when the roof of the company leaks?

Waterproof 5-year warranty, which is not the responsibility of the developer, has expired. If you can't apply for maintenance fund, the maintenance cost should be shared upstairs and downstairs, because it is a public part! Look at the property contract, if there is no agreement, they are not responsible and can help with the maintenance, but the charge is normal! Don't write anything, just go to the property. If it is within the warranty period, they have the responsibility to contact the developer for you. It has expired, so we should discuss with upstairs and downstairs how to deal with it! Provide professional technical consultation on waterproof and leakage repair of concrete free of charge, so as to avoid the troubles of repairing today, leaking tomorrow, repairing every year and leaking every year.