Whether the 7th-Floor House Built 20 Years Ago Is a Prefabricated Panel Structure
Houses on the 7th floor built 20 years ago are not necessarily of prefabricated panel structure. Here is a detailed explanation:
Overall, a significant proportion of 7th-floor houses built 20 years ago adopted prefabricated panel structures. In past construction practices, prefabricated panels were widely used in multi-story residential construction due to their relatively simple construction process and lower cost. Therefore, a considerable number of 7th-floor houses built during that period used prefabricated panels as floor materials.
However, there are also a small number of 7th-floor houses built 20 years ago that are not of prefabricated panel structure. Houses marked as 'mixed structure' on their property certificates cannot be simply equated with prefabricated panel floor houses. 'Mixed structure' mainly describes the load-bearing structural system of a house, usually referring to a brick-and-concrete structure, where brick walls and concrete beams and columns jointly bear the weight of the house. 'Floor house', on the other hand, emphasizes the construction technique of the floor. Houses that use prefabricated panels as floors are called prefabricated panel floor houses, but mixed-structure houses have diversity in floor construction techniques.
Mixed-structure houses may use either prefabricated panels or cast-in-place floors formed by pouring concrete directly onto molds at the construction site to create an integral floor structure. Compared with prefabricated panels, cast-in-place floors have advantages such as better integrity and stronger seismic performance, but their construction process is relatively complex and the cost is higher. In some projects with high requirements for house quality and seismic performance, or when owners have special needs, cast-in-place floors may be chosen. Therefore, one cannot simply determine that 7th-floor houses built 20 years ago are definitely of prefabricated panel structure based solely on the floor level and the 'mixed structure' label.
