Overall Prefabricated Housing Specification Standard

The specification standards for overall prefabricated housing cover fire safety, structural safety, fire resistance and durability, construction inspection and acceptance, as well as supplementary requirements for specific types, as detailed below:

1. Fire Safety and Building Materials

Prefabricated housing must strictly adhere to fire safety regulations. If flammable materials (such as polystyrene and polyurethane foam) are used, they must comply with Article 54 of the Fire Protection Law of the People's Republic of China, and fire hazards must be promptly eliminated; otherwise, temporary closure may be imposed. In crowded places, the use of flammable foam sandwich panels is strictly prohibited, and non-combustible or fire-resistant materials such as rock wool (Class A) must be used to ensure that the fire performance of key components such as walls and floors meets standards.

2. Structural Safety and Seismic Performance

The structural safety standards for modular buildings (the main form of overall prefabricated housing) are consistent with those of traditional cast-in-place buildings, with component production precision reaching the millimeter level, and quality stability superior to on-site operations. According to the Technical Specification for Steel Modular Buildings, their seismic performance can be adapted to seismic fortification zones of magnitude 6-9 in China, and mature products in the industry can even withstand magnitude 8 earthquakes and typhoons of force 12, meeting structural safety requirements in extreme environments.

3. Fire Resistance and Durability

In terms of fire resistance, the walls and floors of modular buildings must use Class A non-combustible materials, and their fire resistance performance must pass national regulatory tests. For durability, the production of prefabricated components must follow strict specifications to ensure dimensional accuracy, strength, and durability. Connection methods (such as bolts and welding) must be secure and reliable to avoid structural risks caused by connection failures.

4. Construction Specifications and Inspection

The construction process must be carried out in an orderly manner according to steps such as foundation treatment, foundation construction, installation of prefabricated components, and roofing and waterproofing works to ensure quality control at each stage. After the completion of the housing, a comprehensive inspection must be conducted, covering structural safety and usability (such as water and electricity supply, ventilation). If necessary, a third-party organization can be commissioned to conduct quality testing to ensure compliance with design and regulatory requirements.

5. Supplementary Requirements for Specific Types of Housing

• Rural self-built cement prefabricated houses: The foundation must have sufficient bearing capacity, and the foundation depth must be designed based on factors such as geological conditions and groundwater levels. The main structure must meet seismic requirements, and the connection of prefabricated components must use high-strength bolts or welding to prevent loosening.
• Modular buildings: Factory production and on-site foundation construction can be carried out simultaneously, shortening the construction period by more than 50% compared to traditional buildings. However, attention should be paid to limitations in personalized design (such as house type and appearance) and transportation costs (special logistics required for oversized and overweight components).