Renovation of Old Prefabricated Panel Houses

Renovation of old prefabricated panel houses requires careful planning, integrating professional assessment, structural reinforcement, functional upgrades, and policy requirements for comprehensive handling.

1. Professional Assessment and Inspection as a Prerequisite
   Before renovating old prefabricated panel houses, it is essential to commission a qualified inspection agency to conduct a comprehensive check, focusing on issues such as wall cracks, steel bar corrosion, and foundation settlement. Approximately 60% of old prefabricated panel buildings nationwide can opt for reinforcement rather than complete demolition after assessment, saving resources and extending the building's lifespan. If the building has exceeded its designed service life (typically 30-50 years), priority should be given to assessing whether it meets the criteria for dangerous buildings to avoid safety hazards caused by blind renovation.

2. Developing Targeted Reinforcement Plans
   Based on the inspection results, take targeted measures:

• Wall Cracks: Minor cracks can be repaired with grouting; severe cracks require reinforcement with steel plates or carbon fiber sheets to prevent further structural deterioration.
• Roof Leakage: Remove the original waterproof layer and lay weather-resistant waterproof materials, ensuring the drainage system is unobstructed.
• Unstable Foundation: If uneven foundation settlement occurs, reinforcement methods such as piling or grouting should be employed to prevent building tilting or collapse.

3. Functional Upgrades to Address Residential Pain Points
   Prefabricated panel houses commonly suffer from poor sound insulation, cramped spaces, and lack of elevators, which can be improved through the following methods:

• Sound Insulation: Use soundproof panels, acoustic cotton, and double-glazed windows to enhance sound insulation by approximately 70%.
• Space Optimization: Reconfigure space by removing non-load-bearing walls and customizing storage furniture to improve living comfort.
• Age-Friendly Renovation: For elderly households, install handrails, non-slip floor tiles, and plan barrier-free access.

4. Seismic Resistance and Safety as Key Considerations
   Prefabricated panel houses have weak seismic performance, so avoid damaging load-bearing structures (such as arbitrarily removing or modifying walls or creating openings) during renovation. If the building's seismic rating is inadequate, reinforce it by adding structural columns and ring beams to ensure compliance with current seismic codes.

5. Balancing Policy and Cost
   According to the 2022 renovation policy, existing prefabricated panel houses are primarily repaired and renovated, with only buildings identified as dangerous being demolished. Reinforcement costs are generally lower than demolition and reconstruction (e.g., in one case, reinforcement costs were less than half of demolition costs), and the construction period is shorter, minimizing disruption to residents' lives.

6. Rational View of Historical Limitations
   Prefabricated panel houses were widely used to address housing shortages due to their fast construction and low cost but have defects such as poor thermal and sound insulation and outdated layouts. During renovation, address these shortcomings through material upgrades (e.g., adding insulation layers) and layout adjustments rather than pursuing extensive demolition and reconstruction.

If the building has severe issues (such as extensive wall peeling or numerous cracks), weigh the feasibility of reinforcement or reconstruction in conjunction with policy and professional advice to ensure both safety and cost-effectiveness.