7.5-Meter-Height Prefabricated House

Currently, there is no specific information directly about the '7.5-meter-height prefabricated house', but prefabricated houses have some common drawbacks that require evaluation of their applicability based on actual conditions.

Common Drawbacks of Prefabricated Houses

1. Poor Seismic Performance
   The components of prefabricated houses are usually prefabricated in factories and then assembled on-site, resulting in weaker overall integrity compared to cast-in-place structures. Under external forces such as earthquakes, stress concentration is prone to occur at the joint connections, leading to structural damage. If a 7.5-meter-height prefabricated house does not adopt reinforced design or special connection techniques, its seismic capacity may not meet the requirements of high-intensity seismic areas.

2. Ground Cracking and Water Leakage
   There are gaps between the prefabricated panels. If proper waterproofing is not carried out during construction or if there is uneven settlement later, cracks may appear on the ground, leading to rainwater leakage. High-rise houses are more sensitive to foundation settlement due to their greater self-weight, and the risk of cracking may further increase.

3. Insufficient Sound and Heat Insulation
   The hollow structure or lightweight materials of prefabricated components may result in poor sound insulation performance, allowing external noise to easily enter the interior. At the same time, their high thermal conductivity makes winter insulation and summer heat insulation ineffective. If a 7.5-meter-height house is used for living or office purposes, additional sound and heat insulation layers are required, increasing costs.

4. Difficulty in Structural Modifications
   The load-bearing structures of prefabricated houses are usually fixed designs. Later, if walls need to be removed, doors and windows need to be added, or the layout needs to be changed, the overall stability may be compromised. Structural modifications to high-rise houses require professional evaluation; otherwise, safety hazards may arise.

Policy and Safety Recommendations

• Renovation and Demolition Standards: According to current regulations, prefabricated houses that have been formally assessed as structurally intact and meeting living standards can be included in renovation plans to extend their service life through reinforcement and waterproofing modifications. If the structural damage meets the criteria for dangerous houses, they should be promptly cleared and demolished. For 7.5-meter-height prefabricated houses, key indicators such as joint connections and foundation settlement should be prioritized for inspection.
• Safety Hazard Investigation: In rural areas, if prefabricated panels are used for house construction, it is necessary to avoid turning new houses into dangerous houses due to non-standard construction. It is recommended to prioritize cast-in-place structures or prefabricated systems that have undergone seismic design and ensure that construction complies with regulations.