Disadvantages of Prefabricated Houses

The disadvantages of prefabricated houses are mainly reflected in insufficient seismic performance, poor sound insulation and thermal insulation, difficulty in adjusting internal structures, high risk of water seepage, short service life, poor structural strength, and frequent cracks.

1. Insufficient Seismic Performance Prefabricated houses primarily rely on the assembly of cement components. Although a small amount of steel reinforcement is added, their overall seismic resistance is significantly lower than that of cast-in-place reinforced concrete structures. The joints between components lack toughness, making them prone to fracture or collapse during natural disasters such as earthquakes or floods, posing a much higher safety risk than modern buildings.

2. Poor Sound Insulation and Thermal Insulation The walls of prefabricated houses are usually thin, and there are gaps between components, resulting in inadequate sound insulation. Residents often report being able to clearly hear their neighbors' conversations or footsteps, affecting privacy and living comfort. Additionally, the thermal insulation performance is weak, making indoor temperatures susceptible to external heat in summer and difficult to retain heat in winter, leading to increased energy consumption.

3. Difficulty in Adjusting Internal Structures The walls of prefabricated houses are mostly load-bearing structures, and large-scale modifications are almost not allowed. If residents need to adjust the spatial layout (such as removing non-load-bearing walls), they may face safety risks due to potential damage to the overall structural stability, limiting the possibility of personalized renovations.

4. High Risk of Water Seepage As the service life increases, cement components are prone to cracking due to thermal expansion and contraction or foundation settlement, and the gaps between components gradually widen. This allows rainwater or domestic water to easily seep in through the gaps, causing water leakage between floors, which not only damages the building structure but may also lead to neighborhood disputes.

5. Short Service Life The design service life of prefabricated houses is typically 30 to 50 years, and houses built earlier (such as those from the 1970s to 1990s) are approaching or have exceeded their service life. Aging phenomena are common, such as carbonization of components and rusting of steel reinforcement, further shortening the actual service life and requiring frequent repairs or reconstruction.

6. Poor Structural Strength Prefabricated panels often adopt a hollow design, with a lower density of steel reinforcement compared to cast-in-place structures, and the joints between components lack integrity. Under external forces (such as earthquakes or impacts), they are prone to severe cracks or even collapse, with significantly lower structural safety than cast-in-place buildings.

7. Frequent Cracks Cracks are a common problem in prefabricated houses, not only weakening the wall strength but also potentially leading to structural instability. The damp environment caused by long-term water seepage can also breed mold and bacteria, posing health risks to residents and increasing medical costs and living risks.