Ministry of Housing Prefabricated Panel House Structure

The Ministry of Housing has not proposed unified requirements for the reconstruction or demolition of prefabricated panel house structures, instead adopting the principle of 'adapting measures to local conditions and implementing differentiated strategies' to take repair and renovation or demolition and reconstruction measures based on the actual condition of the houses.

Repair and Renovation: For Houses with Undamaged Main Structures

For prefabricated panel houses with undamaged main structures, policies clearly require addressing issues through old house renovation rather than direct demolition. Renovation focuses include improving seismic performance and enhancing sound and thermal insulation. For example, adding seismic support structures and reinforcing wall connection joints can significantly improve the house's seismic capacity; using new thermal insulation materials or soundproof layers can compensate for the deficiencies of prefabricated panel structures in thermal and sound insulation. Such renovations can extend the service life of the houses and reduce residents' living costs, aligning with the construction requirements of a 'resource-conserving society'.

Demolition and Reconstruction: For Houses with Serious Safety Hazards

If a prefabricated panel house exhibits the following conditions, it needs to be demolished and reconstructed:

1. Irreparable damage to the main structure: Such as broken prefabricated panels, severely cracked walls, or failed load-bearing components, leading to the loss of overall stability of the house.
2. Inability to withstand natural disasters: After professional assessment, the house's seismic and flood resistance capabilities do not meet standards, posing a risk of collapse. For example, prefabricated panel houses located in earthquake-prone zones or flood-prone areas that do not meet local seismic fortification standards need to be prioritized for demolition.
3. Located on municipal planning land: Due to public interests such as urban renewal and road expansion, houses that need to vacate the land may be included in the demolition scope even if their structures are safe.

Limitations and Replacement Trends of Prefabricated Panel Structures

Prefabricated panel house structures have inherent defects:

• Short service life: Typically 30-50 years, much shorter than the 70-100 years of cast-in-place concrete structures.
• Weak seismic performance: Connection joints between prefabricated panels are prone to failure during earthquakes, leading to the collapse of the entire structure.
• Poor sound and thermal insulation: The hollow panel structure results in rapid heat and sound conduction, reducing living comfort.

With the advancement of construction technology, cast-in-place concrete and prefabricated buildings (such as steel-concrete integrated casting modules) are gradually becoming mainstream. Prefabricated buildings, through factory-prefabricated components and on-site assembly, not only shorten the construction period but also improve seismic performance through standardized design, making them ideal alternatives to prefabricated panel structures.