Specification for Repair of Prefabricated Houses

The specification for the repair of prefabricated houses covers four core aspects: renovation methods, construction standards, approval procedures, and construction management, as detailed below:

I. Renovation Methods and Standards The renovation of prefabricated houses should be selected based on the degree of danger and the condition of the main structure:

1. Demolition and Reconstruction: Suitable for houses that are entirely dangerous and have no repair value. They should be completely demolished and rebuilt according to current standards to ensure the structural safety and functional completeness of the new building.
2. Repair and Reinforcement: For houses that are partially dangerous but have a usable main structure, the aim is to restore functionality by reinforcing load-bearing components and repairing damaged parts, focusing on addressing structural safety hazards.
3. Relocation: For dilapidated houses located in areas unsuitable for habitation, such as geological hazard zones or ecological protection areas, they should be relocated as a whole to safe areas for reconstruction, with supporting infrastructure provided. After renovation, houses must meet basic living needs and safety requirements, including structural safety (meeting seismic and wind resistance standards), good lighting and ventilation (compliant with the Residential Design Code), complete living facilities (water, electricity, and gas supply), and priority should be given to using energy-saving and environmentally friendly materials and green building technologies (such as thermal insulation and solar energy utilization).

II. Construction Standards The construction of prefabricated house repairs must strictly adhere to the industry standard 'Construction Standard for Repair of Civil Buildings' (JGJ/T112-2019), which came into effect on March 1, 2020, replacing the original 'Construction Regulations for Repair of Civil Buildings' (CJJ/T53-93). The new standard imposes stricter requirements on construction processes, material selection, and quality acceptance, for example:

• Structural reinforcement must use materials that meet design strength requirements, and load-bearing capacity calculations must be performed before construction.
• Waterproofing works must be carried out in layers, with a closed water test lasting no less than 24 hours.
• Electrical wiring renovation must use flame-retardant piping, with wire diameters meeting electrical load requirements.

III. Approval Procedures Repair projects must be submitted for approval according to the following process:

1. Residents submit a written application, along with a house danger assessment report, property ownership certificate, and other materials, to their local community (village) committee.
2. The community (village) committee conducts an initial review and then submits it to the township (street) government for a secondary review.
3. The county-level housing and urban-rural development department conducts a final review, focusing on the rationality of the renovation method, compliance of the construction plan, and feasibility of the budget.

IV. Construction and Management Renovation projects must be subject to full supervision:

• The construction unit must carry out construction according to the approved plan and is strictly prohibited from making unauthorized design changes.
• The supervision unit must conduct on-site supervision of material quality and construction techniques, with visual records kept for key processes.
• After project completion, the county-level housing and urban-rural development department shall organize an acceptance inspection, focusing on structural safety, functionality, and environmental indicators. The project can only be handed over for use after passing the acceptance inspection.