1. property management company's approval: before hammering the roof, the construction drawings given by the designer must be submitted to the property management company, and the construction can only be started after approval.
2. The top beam can't be disassembled: some houses have beams at the top, and the key load-bearing parts have played a stabilizing role.
3. Don't knock on the wall connecting the balcony: this wall is a load-bearing wall, and it is risky to make a hole in it to open a window.