Is the House Structure Mixed with Prefabricated Panels?

The term 'mixed structure' on a property certificate does not directly indicate whether the floor panels are prefabricated. Here is a detailed explanation:

'Mixed structure' is a broad category in building structure classification, referring to houses constructed using multiple building materials, such as brick walls paired with reinforced concrete components (beams, panels, columns, etc.). The core characteristic of this structure is the mixed load-bearing of different materials. However, when it comes to the specific form of the floor panels (prefabricated or cast-in-place), it is usually not explicitly stated on the property certificate and requires comprehensive judgment based on other information.

The 'mixed 1' structure generally refers to brick-concrete structure, where brick walls (or columns) serve as vertical load-bearing components, and reinforced concrete beams and panels serve as horizontal load-bearing components. Brick-concrete structures do not exclude the use of prefabricated panels:

• In early buildings, prefabricated panels were often used for non-load-bearing partitions or some floor panels due to their high construction efficiency and low cost;
• Load-bearing floor panels may also use prefabricated panels, but structural measures (such as setting ring beams and structural columns) are required to enhance overall integrity;
• With technological advancements, cast-in-place floor panels have gradually become mainstream due to their good overall integrity and superior seismic performance, especially in multi-story buildings in the Shanghai area after 2007, where cast-in-place floor panels have been widely promoted and are more common in relocation housing.

To confirm the specific form of the floor panels, the following methods can be used:

1. Review the original design drawings: The construction drawings will clearly indicate the type of floor panels (prefabricated or cast-in-place) and construction methods;
2. Conduct on-site inspections: Observe whether the floor panels have joint seams (characteristic of prefabricated panels) or signs of integral pouring (characteristic of cast-in-place panels);
3. Consult the property management or construction unit: Obtain technical documents or construction records from the time of the building's construction;
4. Professional testing: Commission a structural testing agency to directly determine the material of the floor panels through methods such as core drilling.

Summary: The form of floor panels in mixed-structure houses requires comprehensive judgment based on the construction era, local regulations, and specific design. The information on the property certificate can only provide the structural type and cannot directly determine whether the floor panels are prefabricated.