Advantages and Disadvantages of Prefabricated Houses

The advantages of prefabricated houses include low cost, high construction efficiency, stable quality, environmental protection and energy saving, convenient maintenance, and room for improvement in seismic performance; the disadvantages involve insufficient seismic performance in the early stages, poor living experience, weak structural rigidity, weak integrity, and monotonous appearance.

Advantages

1. Low cost: The centralized production of components in factories and the economies of scale significantly reduce material costs by 20%-40% and labor costs by about 60%. For example, the cost per square meter of prefabricated houses in rural areas of Henan is only a little over three hundred yuan, much lower than that of traditional buildings.
2. High construction efficiency: Components are prefabricated in factories and then assembled on-site, shortening the construction period by 50%-70%. The main structure of a 100-square-meter house can be assembled in as fast as 2 hours, and the entire house can be completed within 1 day, greatly reducing the construction cycle.
3. Stable quality: High-precision molds and standardized production ensure that the concrete strength is better than that of traditional construction, and the foundation strength grade is guaranteed, reducing quality problems caused by human errors.
4. Environmental protection and energy saving: Concrete materials reduce construction waste, and the use of recyclable materials reduces construction waste by 80% and has a material recycling rate of over 90%, in line with the trend of green buildings.
5. Convenient maintenance: Damaged local components (such as leaks and breakages) can be replaced individually without large-scale rework, reducing later maintenance costs.
6. Improved seismic performance: New technologies use reinforced concrete integral pouring processes, achieving a seismic performance of up to magnitude 8 and passing magnitude 7 earthquake simulation tests, extending the service life to 70 years.

Disadvantages

1. Poor early seismic performance: Traditional prefabricated panel houses have weak seismic performance due to insufficient steel reinforcement ratios and hollow structures, making them prone to wall cracking or even collapse in earthquake-prone areas.
2. Living experience issues:
   • Ground cracking: Poor connection between walls and foundations and multiple construction joints cause ground cracks to expand over time, making it easy for dust to accumulate and for rodents to hide.
   • Poor sound insulation and heat insulation: Hollow designs and joints result in poor sound insulation, allowing external noise to easily penetrate; it is cold in winter and hot in summer, with high air conditioning energy consumption.
3. Weak structural rigidity: Walls mostly bear the load-bearing function, limiting the flexibility of decoration and making it difficult to carry out large-scale renovations.
4. Weak integrity: The component assembly method results in structural integrity that is inferior to that of cast-in-place buildings, with weaker impact resistance.
5. Monotonous appearance: Standardized design leads to a lack of diversity in appearance, making it difficult to meet personalized needs.
6. High long-term maintenance costs: After 20 years of use, annual maintenance costs increase by 1500-3000 yuan, and regular inspections of component connections and sealing are required.