Prefabricated Panel Flat Roof

Prefabricated panel flat roofs were once widely used in rural self-built houses, offering advantages such as low cost and fast construction, but they also have drawbacks including poor waterproofing, earthquake resistance, thermal insulation, and load-bearing risks.

Advantages:

1. Low Cost: The cost of a prefabricated panel flat roof is significantly lower than that of a cast-in-place concrete roof. For example, for a 40-50 square meter auxiliary building, the total cost of using prefabricated panels is about 800 yuan, while the cost of a cast-in-place concrete roof exceeds 3,000 yuan. This cost advantage makes it the preferred choice for rural self-built houses with limited financial resources or tight budgets.
2. Fast Construction: Prefabricated panels are produced in a standardized factory setting and only require lifting and assembly on-site, resulting in a short construction period. Rural self-built houses can typically complete roof installation in one day or half a day, significantly shortening the construction timeline and reducing labor costs.

Disadvantages:

1. Prominent Waterproofing Issues: There are gaps at the joints of prefabricated panels, and if waterproofing is not handled properly, the probability of leakage is extremely high. In rural areas, it is commonly reported that "8 out of 10 houses leak," and the waterproofing industry cannot guarantee 100% leak-proofing, requiring regular maintenance or secondary treatment.
2. Poor Earthquake Resistance: Prefabricated panels are assembled as a whole, with a low earthquake resistance coefficient, and are prone to collapse in earthquake-prone areas. Therefore, such roofs are not suitable for earthquake zones or areas with frequent geological activity.
3. Insufficient Thermal Insulation: Prefabricated panels are about 12 centimeters thick and, although hollow-designed, have limited thermal insulation effects. Indoor temperatures are high in summer and low in winter, necessitating the use of secondary thermal insulation materials (such as foam boards or tiles) to improve thermal performance.
4. High Load-Bearing Risks: Rural self-built houses are often designed without considering additional roof loads (such as solar equipment or brackets). If the house is old or has not undergone structural calculations, an increase in weight of 15-25 kilograms per square meter may cause the prefabricated panels to crack or collapse, posing safety hazards.

Summary: Prefabricated panel flat roofs are suitable for rural self-built houses with limited budgets, tight construction schedules, and outside earthquake zones, but their drawbacks in terms of waterproofing, earthquake resistance, thermal insulation, and load-bearing must be weighed. If choosing such a roof, it is recommended to strengthen waterproofing measures, avoid adding heavy objects, and regularly inspect the structural safety.