Hidden Dangers of Prefabricated Panel Structure Houses

The hidden dangers of prefabricated panel structure houses are mainly reflected in the following aspects:

1. Insufficient structural integrity and earthquake resistance
Prefabricated panel houses are assembled from prefabricated components, lacking the integrity of cast-in-place concrete, resulting in weak structural connections. In disasters such as earthquakes or floods, joints are prone to loosening, detachment, and may even trigger overall collapse, with significantly lower safety prevention capabilities compared to cast-in-place structural houses.

2. Short service life and prominent aging issues
The designed service life is typically 30-50 years, and houses built in the 1970s-1990s have mostly approached or exceeded this lifespan. Aging manifests as wall cracks, ceiling water leakage, concrete carbonization leading to steel bar corrosion, and even a decrease in structural load-bearing capacity.

3. High risk of wall cracks and water leakage
Cement components develop cracks due to thermal expansion and contraction or foundation settlement. As the gaps between components widen, water leakage between floors is prone to occur on rainy days, and long-term leakage accelerates structural deterioration.

4. Poor thermal insulation and sound insulation performance
The limited thickness of prefabricated panels and the lack of thermal insulation materials result in stuffy interiors in summer and cold interiors in winter; air leakage through wall gaps and around doors and windows intensifies in extreme weather. Additionally, the weak sound insulation effect of the floor slab makes neighbors' activities clearly audible, affecting living privacy.

5. Restricted internal structural modifications
The walls of prefabricated panel houses are mostly load-bearing structures, and large-scale demolition and modification (such as breaking through non-load-bearing walls) may damage overall stability, making it difficult for residents to adjust the spatial layout according to their needs.

6. Illegal modifications exacerbate safety hazards
Unauthorized actions such as demolishing load-bearing walls, adding floors on the roof, and stacking heavy objects on the floor slab can alter the structural force system; converting residential buildings for commercial use (such as increasing equipment loads) may also exceed the designed load-bearing capacity, further threatening safety.

7. Special hidden dangers in joint connections and components

• Joint connections: Prefabricated panels are prone to loosening at wall supports, and detachment or cracks may occur at wall corners and intersections.
• Prefabricated floor slabs: Common issues include transverse through-cracks at the bottom of the slab, joint cracking, deflection deformation, loose concrete at the ends, and exposed and corroded steel bars.
• Load-bearing walls: Vertical/diagonal cracks, cracking and downward pressure on door and window lintels, weathering and spalling of brickwork at the bottom of the ground floor walls, affecting structural stability.

Suggestions for hidden danger inspection: Preliminary inspections should focus on "structural integrity", "component condition", and "usage and modification conditions", with emphasis on checking joint connections, crack development, and traces of illegal modifications. If necessary, entrust a professional institution for appraisal.