Pitfalls of Concrete Prefabricated Houses

The potential pitfalls of concrete prefabricated houses mainly focus on structural integrity, earthquake resistance, leakage, and appearance defects, requiring special attention to the following issues:

1. Structural Form and Construction Process Defects

Prefabricated panels are hollow concrete components produced in factories in a standardized manner, relying on on-site assembly and laying, with joints filled with mortar. Although this process can shorten the construction period, it poses a risk of weak overall integrity. Due to the combination of prefabricated panels with brick wall load-bearing systems, there is a lack of steel reinforcement connections between the panels and walls, as well as between the panels themselves, making them prone to misalignment or even collapse under external forces such as earthquakes. For example, some older prefabricated panel houses have suffered severe damage in earthquakes due to their loose structures, leading many local housing and construction departments to list them as priorities for earthquake resistance renovation or demolition.

2. Insufficient Earthquake Resistance and Structural Integrity

The earthquake resistance weakness of prefabricated panel houses stems from their modular structure. Independent panels lack steel reinforcement penetration and rely solely on mortar connections, resulting in poor overall integrity and difficulty in forming a continuous load-bearing system. In contrast, cast-in-place floors are poured as a whole with steel reinforcement mesh, forming rigid connections that effectively disperse earthquake energy and enhance structural stability. Therefore, prefabricated panel houses pose compliance risks in areas with high earthquake resistance requirements, with some cities explicitly restricting their new construction or requiring renovation.

3. Frequent Leakage and Crack Issues

Leakage in prefabricated panel houses follows a regular pattern, commonly occurring at panel joints, pipe roots, and where waterproofing layers have aged and failed. Since water can travel long distances through holes and joints within the panels, the leak source often does not match the visible location, making repairs difficult. In contrast, cracks in cast-in-place floors are mostly non-structural and concentrated at corners, caused by concrete shrinkage, temperature stress, or improper construction curing. However, their overall waterproofing performance is significantly better than that of prefabricated panels.

4. Appearance Defects of Concrete Structures Affecting Durability

Self-built prefabricated houses in rural areas are prone to appearance defects such as honeycombing, cracks, exposed reinforcement, color differences, sanding, and hollowing. These defects not only affect aesthetics but may also reduce structural safety. For example, honeycombing weakens concrete strength and accelerates steel reinforcement corrosion; excessive cracks can lead to water seepage, steel reinforcement corrosion, and even structural failure. Strict control over concrete mix ratios, vibration, and curing processes during construction is necessary to prevent these defects.

Summary: Concrete prefabricated houses have significant shortcomings in structural integrity, earthquake resistance, waterproofing, and appearance quality, requiring risk mitigation through optimized design, enhanced construction supervision, and regular maintenance. For use in earthquake-prone areas or high-demand scenarios, cast-in-place structures are recommended as a priority.