Houses with Prefabricated Floors Are Not Necessarily Dangerous Buildings

Houses with prefabricated floors are not necessarily dangerous buildings.

Prefabricated floor buildings have shortcomings but are not equivalent to dangerous buildings: Prefabricated floor buildings do have some shortcomings in construction technology. For example, the joints between prefabricated panels are prone to water leakage because there may be gaps at these joints, which are susceptible to rainwater erosion after long-term use. Additionally, their seismic performance may be slightly inferior to that of cast-in-place floors because cast-in-place floors form a monolithic structure during the pouring process, whereas prefabricated panels are assembled through joints. However, these shortcomings are not sufficient to directly classify prefabricated floor buildings as dangerous buildings. The determination of dangerous buildings requires a comprehensive consideration of multiple factors and cannot be made solely based on the type of floor.

Whether a house is dangerous depends on the appraisal result: The safety of a house is not determined by its age but rather by evaluation by a professional appraisal agency. Based on the appraisal results, houses are classified into different grades. Among them, Grade D dangerous buildings refer to those with serious problems such as foundation settlement and cracking of load-bearing walls. These houses can no longer meet the requirements for safe living and need to be demolished. Most old buildings, however, may only exhibit normal aging phenomena such as water leakage and cracking. These issues can still allow for safe living after proper waterproofing and repair measures are taken.

Conditions for including prefabricated panel houses in the demolition scope: For prefabricated panel houses, they may only be prioritized for inclusion in the demolition scope if they are appraised as having damaged main structures and being unable to withstand natural disasters. This means that even if a house uses prefabricated panels for its floors, as long as its main structure remains intact and capable of withstanding natural disasters, it will not be easily demolished. Therefore, prefabricated panel houses cannot be equated with dangerous buildings, nor can it be generalized that all prefabricated panel houses need to be demolished.