Prefabricated Panels for Rural House Roofs
There are numerous issues with using prefabricated panels for rural house roofs. If economically feasible, it is recommended to use cast-in-place concrete for roofing. Detailed analysis is as follows:
Poor Waterproof Performance: Roof leakage is a prominent issue with prefabricated panel roofs, with 8 out of 10 households experiencing leakage. The main reason is that prefabricated panels are assembled in sections, and the joints between two panels are prone to cracking due to material shrinkage, construction errors, or foundation settlement, leading to water infiltration. Over time, the aging of waterproof materials at the joints also exacerbates the risk of leakage.
Inadequate Thermal Insulation: Prefabricated panels have a low material density and strong thermal conductivity, resulting in high indoor temperatures in summer and low indoor temperatures in winter. To improve living comfort, additional insulation layers or secondary roofing (such as tiles or color steel plates) are usually required on the panels, which increases construction costs and roof loads.
Insufficient Seismic Resistance: The connection between prefabricated panels and walls is often rigidly fixed, making them prone to collapse in earthquake-prone areas due to poor structural integrity. Their seismic coefficient is significantly lower than that of cast-in-place concrete roofs, failing to meet modern building seismic design standards and posing safety risks.
Poor Sound Insulation: Prefabricated panels have a hollow or low-density internal structure, resulting in weak sound insulation capabilities. Noise from daily activities upstairs (such as walking or moving furniture) can easily transmit downstairs, affecting living privacy.
Limited Service Life: Prefabricated panels are exposed to natural elements for extended periods, and factors such as weathering and corrosion can reduce their design life to typically only 30 years. Over time, structural strength gradually decreases, requiring regular maintenance or replacement.
Policy Adaptability Risks: Affected by policy adjustments from the Ministry of Housing and Urban-Rural Development, urban village renovations, and new safety regulations for rural self-built houses, prefabricated panel houses may face demolition or renovation requirements. Using prefabricated panels for roofs may increase the risk of non-compliance in the future, affecting long-term use value.
