Is Prefabricated Panel Housing Unsafe?

Prefabricated panel housing does indeed have unsafe factors, mainly reflected in aspects such as seismic performance, connection stability, material quality, and service life. Risks need to be evaluated based on specific circumstances.

1. Insufficient Seismic Performance
   Prefabricated panel houses have relatively poor integrity and are prone to collapse during earthquakes. Their designs often adopt hollow structures, and the quantity and distribution of steel bars are not as scientific as those in cast-in-place houses. Even slight vibrations can cause the joints between floor slabs to loosen, resulting in a high risk of collapse and short escape times. For example, in earthquake-prone areas, the damage rate of prefabricated panel houses is significantly higher than that of cast-in-place structural houses.

2. Weak Connection Points
   The connections between prefabricated panels and walls, as well as between panels themselves, are simple and lack rigid framework support. When foundation settlement or wall cracking occurs, the connection points are prone to misalignment and loosening. After long-term use, weathering and steel bar corrosion will further reduce strength. This structural defect is particularly prominent in old houses and may lead to overall instability due to local damage.

3. Substandard Material Quality
   Some prefabricated panels use thin steel wires instead of steel bars, and the concrete grades do not meet standards, making them brittle and prone to fracture. When the load exceeds the designed bearing capacity, they may suddenly collapse, posing serious safety hazards. Such problems are more common in houses built with non-standard construction practices in the early days, and professional testing is required to confirm the material strength.

4. Short Service Life
   The designed service life of prefabricated panel houses is about 30 - 50 years. Houses built in the 1970s - 1990s are approaching or have exceeded this lifespan, and problems such as wall cracks, ceiling water leakage, and structural looseness are common. Some have been identified as dangerous houses. These houses need regular structural safety assessments and timely reinforcement or renovation.

5. Poor Thermal Insulation and Sound Insulation
   Prefabricated panel houses are cold in winter and hot in summer, and the sounds of neighbors can be clearly heard, affecting living comfort. Although they do not directly threaten safety, long-term residence may reduce the quality of life, and improvements can be made by adding thermal insulation layers or sound insulation materials.

6. High Risk of Water Seepage
   Cracks and gaps in cement components increase, leading to water seepage between upper and lower floors. Indoor water leakage is common on rainy days. Water seepage not only damages the decoration but may also corrode steel bars, further weakening the structural stability. The waterproof layer needs to be repaired in a timely manner.

7. Limited Internal Structure Adjustment
   Walls may bear structural functions, and large-scale modifications (such as removing non-load-bearing walls) may damage the overall stability and pose safety hazards. Before decoration, the nature of the walls needs to be confirmed to avoid unauthorized modifications.