Is Prefabricated Housing Safe?

The safety of prefabricated housing cannot be generalized; it has both potential safety hazards and safety guarantees, requiring a comprehensive assessment based on multiple factors.

Situations with Safety Hazards

• Foundation Issues: If the foundation is not properly handled and uneven settlement occurs, it can be fatal to prefabricated houses, leading to irreversible tilting and cracking. Due to the relatively poor integrity of prefabricated housing, the instability of the foundation directly affects the structural stability of the house.
• Construction Height: In terms of construction height, the higher the building, the greater the load borne by the prefabricated parts at the bottom. If the bottom is not reinforced, it is prone to being crushed, leading to continuous collapse. This requires that when designing prefabricated housing, the bottom structure must be reasonably designed according to the height to enhance its load-bearing capacity.
• Joint Treatment: If the joints of prefabricated components are not properly treated, the roof and walls will continuously leak water. Joints are the weak links of prefabricated housing. If not tightly sealed, rainwater and other substances can seep into the interior, not only affecting living comfort but also potentially corroding the internal structure and reducing the safety of the house.
• Issues with Traditional Prefabricated Panel Houses: Traditional prefabricated panel houses in the past had poor integrity and almost zero earthquake resistance. During earthquakes, the floor slabs and walls were prone to instant separation and collapse. The connection points were fragile, and foundation settlement and wall cracking could cause the panels to shift and loosen. Over time, the connection points would weather, and the steel bars would rust, reducing strength. Additionally, the materials were often shoddy, with high brittleness and a tendency to break. Exceeding the load capacity could result in instant and unforeseen breakage.

Situations with Safety Guarantees

• New-type Prefabricated Housing: Some new-type prefabricated houses now offer safety guarantees. For example, the cement 'prefabricated houses' that have emerged in Henan are manufactured in factories using precise calculations and molds for the prefabricated components. The main body of the house is a reinforced concrete structure, which is solid and reliable, with a quality guarantee period of up to 70 years. It has wide applicability and can be built up to 5 stories high.
• Some Prefabricated Panel Buildings: Not all prefabricated panel buildings are dangerous. A large number of prefabricated panel buildings in China have been safely inhabited for 40, 50, or even longer years, and they do not automatically collapse after 30 years. This indicates that as long as they are constructed in accordance with relevant standards and properly maintained afterward, prefabricated housing can also have a long service life and a certain degree of safety.