Which Houses Are Prefabricated Panel Houses

Prefabricated panel houses were mainly constructed in a concentrated manner from the 1970s to the 1990s, using prefabricated cement components for assembly and factory-made cement panels for floors, with some extending to around 2000. They can be identified by the following characteristics:

I. Construction Era and Background
The peak construction period for prefabricated panel houses was from the 1980s to the 1990s, with some extending to around 2000. During this time, to address the housing needs of employees, a large number of such residences were built using industrialized rapid construction methods. If a house was built during this period, especially if it was a unit welfare housing allocation or in an old residential area, it is important to check whether it has a prefabricated panel structure.

II. Structural Characteristics and Material Forms

1. Assembled Floor Panels: The floor panels are made of factory-prefabricated cement panels (solid or hollow) that are transported to the site and assembled, rather than being cast as a whole. This structure results in poor overall integrity of the house, making it prone to issues such as water leakage through floor panel seams and wall cracking.
2. Material Types: Prefabricated panels are mainly made of concrete, with a minority being steel or wooden. Concrete prefabricated panels are widely used due to their low cost and fast construction, but they have relatively weak durability and are prone to aging after long-term use.
3. Risk Levels:
   • Dilapidated Houses: Prefabricated panel houses that have been professionally assessed as Grade D dilapidated houses (e.g., with foundation settlement exceeding 5 cm or load-bearing wall cracks exceeding 1 mm) pose serious safety hazards.
   • Poor Disaster Resistance: Houses with earthquake resistance levels 70% below current standards and weak flood resistance are often found in early-designed prefabricated panel structures.
   • Impact on Urban Planning: Prefabricated panel houses located in municipal engineering planning areas or commercial development zones in urban core areas may be included in renovation plans due to planning adjustments.

III. Simple Identification Methods

1. Observe the Construction Era: Prioritize checking residential buildings constructed in the 1980s to 1990s, especially old residential areas or unit dormitories.
2. Inspect the Interior of the House: If cracks appear along the panel seams on the ceiling or if the roof frequently leaks, it may be due to water leakage through the seams of the prefabricated panel assembly.
3. Consult Archival Materials: Check the house structure type through property certificates, construction archives, or the housing and construction department of the community to confirm whether it is a prefabricated panel building.

Due to structural limitations, prefabricated panel houses have shortcomings in terms of safety and durability. A comprehensive assessment should be made based on the construction era, structural characteristics, and professional evaluations. If a house exhibits the above characteristics, it is advisable to further contact the housing and construction department or a professional organization for a safety assessment.