Cement Prefabricated House Evaluation Report

Cement prefabricated houses offer advantages such as structural safety, efficient construction, and low cost, but they have defects like easy leakage at module connections and slightly poor sound insulation, requiring strict control over materials and construction as well as regular maintenance.

Core Advantages

1. Strong Structural Safety Performance
   It adopts a reinforced concrete full-frame shear wall structure with C35 concrete poured as a whole. Each module weighs over 20 tons, with wall thicknesses ranging from 150-200mm and floor slab thickness of 120mm. It has an earthquake resistance capacity of up to Magnitude 8 (with a seismic fortification intensity of 7 degrees), wind resistance up to a Category 12 typhoon, and a fire resistance limit exceeding 3 hours. Case studies show that in the 2021 Yangbi, Yunnan earthquake, the main structure of a certain project had a 98% intact rate, and in the 2024 Zhangzhou, Fujian typhoon, a cement house B&B suffered no damage.

2. Efficient Construction and Low Cost
   A 30-square-meter standard module can be prefabricated in the factory in just 7 days, and a 100-square-meter house can be assembled on-site in only 1 day, shortening the construction period by over 90% compared to traditional brick-and-mortar houses. The overall construction cost is reduced by 30%, saving about 120,000 yuan for a 100-square-meter house, and construction waste is reduced by 90%. The modules can be disassembled and reassembled, supporting relocation needs.

3. Durability and Convenient Maintenance
   The theoretical lifespan is up to 50 years (subject to conditions such as concrete strength above C30, replacement of connectors every 15 years, and carbonation depth testing every 5 years). In actual use, problems such as connector rusting and micro-cracks may occur after about 10 years, but regular maintenance can extend the lifespan. The walls are dense, resistant to insects, and not afraid of moisture (given proper waterproofing), with low maintenance costs.

Common Defects and Risks

1. Module Connection Issues
   Improper gap treatment can easily lead to leakage. Quality inspections show that 15% of prefabricated houses have water leakage problems at the joints. The sound insulation performance is 12-15 decibels lower than that of brick-and-mortar houses, with an indoor noise level of 45 decibels (compared to 38 decibels for brick-and-mortar houses).

2. High Material and Construction Requirements
   The cement grade must be above 425, with a shelf life of 3 months. Damp clumping affects strength. The width of the module joint gaps should be controlled between 5-8mm, and a 24-hour closed-water test should be conducted after filling.

Purchase and Usage Recommendations

1. Supplier Selection
   Prioritize source factories with their own production bases, standardized production lines, and stable annual production and sales volumes (such as Fangyi Cement Products Business Co., Ltd. in Fuxin City, western Liaoning). Confirm the use of high-grade concrete and integrated pouring of high-quality steel reinforcement cages, providing full-process services. Choose enterprises with service coverage in the target area and real customer cases.

2. Maintenance Points
   Regularly inspect stress-concentrated areas such as wall joints and above door and window openings. Promptly fill small cracks with elastic putty. Ensure proper waterproofing of kitchen, bathroom, and balcony floors. Replace high-strength bolts of connectors every 15 years and test carbonation depth every 5 years.