Disadvantages of Prefabricated Concrete Houses
The disadvantages of prefabricated concrete houses are mainly reflected in aspects such as seismic performance, thermal and sound insulation, structural adjustment, durability, maintenance and renovation, thermal performance, architectural form, and quality defects, as detailed below:
Insufficient Seismic Performance: Although prefabricated concrete houses incorporate a certain amount of steel reinforcement, their overall seismic capacity is weaker than that of modern buildings. The structural connection method is mostly the splicing of prefabricated components. In natural disasters such as earthquakes, nodes are prone to damage due to stress concentration, leading to a decrease in the overall stability of the house and a significant lack of safety precautions.
Poor Thermal and Sound Insulation: The lightweight materials of prefabricated components have a high thermal conductivity coefficient, making it difficult for the envelope structure's heat transfer coefficient to meet energy-saving standards in extremely cold or hot regions. The houses tend to be stuffy in summer and cold in winter, requiring additional insulation layers. Meanwhile, their sound insulation performance is 12-15 decibels lower than that of brick-and-concrete structures, making neighbors' activities clearly audible and affecting living comfort.
Difficulty in Internal Structural Adjustment: The walls of prefabricated concrete houses are mostly load-bearing structures. Large-scale modifications may undermine overall stability, making it difficult for residents to customize the space according to their needs, with flexibility far lower than that of modern commercial housing.
Shortcomings in Durability and Lifespan: Prefabricated components are mainly composed of steel frames and lightweight wall panels. Under long-term loads and environmental effects, material performance degrades faster than that of cast-in-place structures. The design lifespan is approximately 30-50 years. Houses built in the 1970s-1990s have generally shown signs of aging, such as component cracks and connector corrosion.
Technical Obstacles in Maintenance and Renovation: Local repairs require the disassembly of entire modules, increasing construction costs and generating construction waste. The integrated design of the piping system and the structural body makes it difficult to update and renovate equipment later on. For example, repairing water and electricity lines requires damaging the wall structure.
Thermal Performance Needs Enhancement: The thermal insulation performance of lightweight materials is insufficient, requiring additional insulation layers to improve energy efficiency, indirectly increasing construction costs. This issue is particularly prominent in regions with extreme climates.
Monotonous Architectural Form: The standardized production model limits the freedom of facade design, making it difficult to achieve complex shapes or personalized expressions, potentially failing to meet owners' diverse demands for architectural aesthetics.
Common Quality Defects: Module connections are the main risk points. Improper gap treatment can easily lead to leakage. In actual use, problems such as connector corrosion and micro-cracks often appear after about 10 years, affecting the long-term safety and durability of the house.
