Disadvantages of Concrete Prefabricated Houses
The disadvantages of concrete prefabricated houses are mainly reflected in the following aspects:
Insufficient seismic performance: Concrete prefabricated houses have poor integrity, with a structure similar to "building a house with building blocks". The connections between panels and walls, as well as between panels themselves, are not strong enough. During an earthquake, the floor slabs and walls can easily separate instantly, and the collapse process is sudden, lacking crack warnings and deformation buffering mechanisms, leading to severe collapses and high casualty rates.
Poor sound insulation and thermal insulation: Prefabricated houses perform poorly in terms of thermal and sound insulation. Due to the material properties of the walls and floor slabs, the interior is hot in summer and cold in winter, and the sounds of neighbors can be clearly heard, seriously affecting the quality of life of occupants.
Difficult to adjust internal structure: Unlike modern commercial housing, the internal structure of concrete prefabricated houses is almost not allowed to be significantly altered. Every wall may be related to the stability of the overall structure, making it difficult for residents to customize or adjust their living space according to personal needs.
High risk of water seepage: Over time, cement components may develop cracks, and the gaps between components may also increase, increasing the risk of water seepage between floors, affecting the durability and living experience of the house.
Short service life: The design life of concrete prefabricated houses is about 30 to 50 years. Many houses built in the 1970s to 1990s are approaching or have exceeded their intended service life, showing signs of aging and requiring more maintenance and repairs.
Vulnerable connection points: There is usually only simple overlapping between prefabricated panels and walls, and simple filling between panels, lacking reinforcing structures such as ring beams and structural columns. The entire house lacks a rigid framework. When the foundation settles or the walls crack, the panels are prone to misalignment and loosening. Over time, the connection points weather, the steel bars rust, and the strength decreases.
Substandard materials: Some prefabricated houses have problems with substandard materials, such as high brittleness and easy fracture. The steel bars in regular prefabricated panels are thin, and small workshops even use thin steel wires instead of steel bars. The concrete grade does not meet the standards, and the thickness is insufficient. When exceeding the load-bearing capacity, it can break instantly without warning.
Low structural strength: Prefabricated houses with hollow designs have a less scientific and reasonable distribution of steel bars compared to cast-in-place houses, lacking firmness and toughness. Even slight vibrations can cause the joints between floor slabs to loosen, with cracks increasing in number and size. Eventually, the entire house may collapse, and improper decoration can also easily lead to safety hazards.
