Quality Assurance for Prefabricated Houses

The quality assurance of prefabricated houses covers multiple aspects, including material performance, warranty period, usage and maintenance, and assembly technology, as detailed below:

Material and Structural Performance

The main components of prefabricated houses (such as prefabricated wall panels, floor slabs, roof panels, beams, and columns) are typically made of high-quality materials, offering high compressive, tensile, and seismic resistance. For example, the quality assurance period for prefabricated houses with reinforced concrete structures can reach 70 years (as promised by some manufacturers), and their structural safety and durability can meet national standards under normal use and maintenance. However, it should be noted that compared to cast-in-place houses, the seismic performance of prefabricated houses may be slightly weaker. They can meet requirements in non-seismic zones or low-rise buildings, but for high-rise buildings or those in earthquake-prone areas, reasonable design is necessary to ensure structural safety.

Warranty Period and Scope

The warranty period for prefabricated houses is generally five years (from the date of delivery). During this period, the manufacturer is responsible for free repair or replacement of damages caused by material defects or construction quality issues. The warranty scope includes:

• Structural Safety: No deformation of prefabricated beams and columns, and no cracks in walls;
• Functional Performance: Waterproofing (e.g., no leakage on the roof), thermal insulation, fire resistance, etc.;
• Component Installation: Well-sealed doors and windows, flat stair treads, intact roof waterproofing layers, etc.

Usage and Maintenance Requirements

Users must comply with national regulations and industry standards, use the house correctly, and perform regular maintenance, such as:

• Avoiding severe impacts, collisions, or fires;
• Preventing long-term exposure to harsh environments (e.g., strong corrosive gases, extreme temperature differences);
• Regularly inspecting structural connection points (e.g., bolts, welds) for looseness or corrosion. Damages caused by improper user handling may not be covered under the warranty.

Assembly and Connection Technology

The core quality of prefabricated houses depends on the assembly and connection between modules. Proper splicing and reasonable design can ensure that the overall building functions (such as airtightness, watertightness, and seismic resistance) meet standards. For example, using high-strength bolts or welding processes to connect beams and columns can enhance structural stability; filling wall joints with sealant can improve waterproofing performance. The assembly quality directly affects the lifespan of the house and must be carried out and inspected by a professional team.

Limitations

Although prefabricated houses offer modular advantages (factory prefabrication, controllable quality), the number of floors and seismic requirements must strictly match design specifications. For example, high-rise buildings or those in earthquake-prone areas require more complex connection technologies (such as seismic dampers) or increased structural reinforcement; otherwise, they may not meet seismic requirements.