Building roofs do not need maintenance and protection. Unattended roof is a technical term of building roof engineering, which is formed according to whether building roof engineering needs building roof maintenance, maintenance and other projects. If maintenance is needed, the roof project will be designed as the main building project when it is under construction, otherwise it will not be the main building project. The common roof construction forms are mainly bricklaying and cast-in-place concrete, which are used to protect the roof quality.