What Are the Disadvantages of Prefabricated Houses

The main disadvantages of prefabricated houses include the following points:

1. Poor Seismic Performance
   Prefabricated houses are assembled from prefabricated panels, resulting in insufficient integrity and a lack of firmness and toughness. Their structures do not form a rigid framework through integral pouring. Even slight vibrations can cause the joints between floor panels to loosen, making them prone to sudden collapse during earthquakes, with rapid collapse speeds and high casualty rates. For example, some old prefabricated panel houses have suffered structural damage even in low-intensity earthquakes.

2. Short Service Life
   The designed service life of prefabricated houses is typically 30 to 50 years, but the actual lifespan may be shorter. Many houses built in the 1970s to 1990s are approaching or have exceeded their service lives, experiencing issues such as material aging and reduced structural strength. Some houses have even been classified as “dangerous buildings” within 20 to 30 years, with high repair costs and difficulties.

3. High Risk of Wall Cracks and Water Leakage
   Over time, cement components are prone to developing cracks, and the gaps between components widen, leading to frequent water leakage problems. Common issues include wall cracks, ceiling leakage, floor deformation, and window leakage, affecting living safety and comfort.

4. Poor Thermal Insulation Performance
   The wall materials of prefabricated houses have insufficient thermal insulation properties, causing indoor temperatures to be significantly affected by the external environment. In winter, cold air easily seeps in through gaps in the walls or around doors and windows, while in summer, high outdoor temperatures make the interior stuffy, resulting in a poor living experience during extreme weather conditions.

5. Inadequate Sound Insulation
   The prefabricated panel structure has weak sound-blocking capabilities, allowing sounds from neighbors' activities to easily penetrate the walls, affecting living privacy and quality of life, especially in densely populated areas.

6. Limited Internal Structure Adjustments
   The spatial layout of prefabricated houses is fixed during design, with walls often serving as structural supports, making it difficult for residents to carry out large-scale renovations or personalized adjustments, resulting in far less flexibility compared to modern commercial housing.

7. Vulnerable Connection Points
   Prefabricated panels are connected to walls and to each other through simple overlapping or filling, lacking reinforcing structures such as ring beams and constructional columns. Foundation settlement or wall cracking can cause panel misalignment and loosening. Over time, weathering at the connections and steel bar corrosion further reduce structural strength, potentially triggering a chain collapse.

8. High Risk of Substandard Materials
   During the production process of some prefabricated houses, there are instances of cutting corners, such as using thin steel wires instead of steel bars, non-compliant concrete grades, or insufficient thickness. Such houses are brittle and prone to fracture, potentially collapsing instantly under overload without any warning signs.