Risks of Prefabricated Panel Structure Houses

Prefabricated panel structure houses have multiple risks, as detailed below:

1. Low structural strength and poor earthquake resistance
Prefabricated panel houses are assembled from prefabricated panels, lacking overall robustness and toughness. They often feature a hollow design, with the quantity and distribution of steel bars being less scientific than those in cast-in-place structures. Their earthquake resistance is extremely poor; slight vibrations can cause the joints between floor panels to loosen, and over time, cracks can increase in number and size, potentially leading to the collapse of the entire building. Improper renovation (such as drilling holes or knocking down walls) can also damage structural stability, increasing safety hazards.

2. Short service life and high repair costs
The design life of prefabricated panel houses is typically shorter than that of cast-in-place concrete buildings, possibly only 20-30 years. Over time, issues such as material aging, construction defects, or cost-cutting measures can accelerate building deterioration, with many old prefabricated panel houses being classified as “dangerous buildings.” Repairs require professional reinforcement, which is costly and difficult, and some buildings may even need to be demolished and rebuilt.

3. Prominent issues with wall cracks and water leakage
Wall cracks and ceiling water leakage are common problems, with top-floor residents being particularly affected. During the rainy season, rainwater can seep into the interior through cracks, causing discoloration of walls, deformation of floors, water leakage from windows, and even affecting electrical safety. Poor sound insulation is also a typical defect, with neighbors' daily activities easily penetrating the walls, reducing living comfort.

4. Poor thermal insulation performance
Prefabricated panel buildings have insufficient thermal insulation capacity. In winter, cold air can easily infiltrate through gaps in walls and around doors and windows, requiring additional heating; in summer, indoor temperatures rise with the outdoor temperature, increasing air conditioning energy consumption. In extreme weather, large indoor temperature differences affect the living experience.

5. Limited internal structural adjustments
The walls of prefabricated panel houses often serve as structural supports, and large-scale modifications (such as removing non-load-bearing walls) can damage overall stability, making it difficult for residents to customize space layouts according to their needs, with flexibility far lower than that of modern commercial housing.

6. Vulnerable connection points prone to misalignment and loosening
Prefabricated panels are connected to walls and to each other through simple overlapping or filling, lacking the rigid support of ring beams and structural columns. Foundation settlement or wall cracking can cause panel misalignment and loosening, while long-term weathering or steel bar corrosion can further reduce connection strength. After two or three decades of use, floor panels may become precarious and even collapse due to local overloading.

7. High risk of brittle failure due to cost-cutting in materials
Some prefabricated panel production involves cost-cutting measures, such as using thin steel wires instead of steel bars, substandard concrete grades, or insufficient thickness, resulting in increased brittleness. Once the load-bearing limit is exceeded, the prefabricated panels may break instantly without warning, with accidents potentially triggered by stacking heavy objects, renovation impacts, or aging over time.