Rain Leakage in Prefabricated Panel Houses

The main causes of rain leakage in prefabricated panel houses are joint defects, weak waterproof layers, and material aging. Solutions include covering with color-steel roofs, repairing with waterproof membranes, or covering with plastic films, but costs and effects need to be balanced.

Analysis of Rain Leakage Causes

1. Joint Treatment Defects: Prefabricated panels are connected through grouting or welding, but joint cracking can occur due to earthquakes and thermal expansion and contraction caused by temperature changes. For example, in the Sanxiaokou Qiguitang Community in Hefei, rainwater once flowed through the interior of the prefabricated panels, and the structural defects made it impossible to completely repair.
2. Weak Waterproof Layers: The quality of waterproof layers during construction varies, making them prone to failure. Case studies of rural self-built houses show that 8 out of 10 households have rain leakage problems, and repeated leakage still occurs even after multiple repairs.
3. Accelerated Material Aging: The service life of prefabricated panels is about 10 years. After aging, cracks increase, and leakage worsens during heavy rain. The Anding Community in Mocheng Street, Changshu City (built in 1993) has long had roof leakage problems due to the aging of prefabricated panels.

Comparison of Solutions

1. Color-Steel Roof Covering: It offers the best overall waterproofing effect, with a cost of about 60 - 80 yuan per square meter, suitable for long-term use and scenarios with sufficient budgets. However, attention should be paid to installation quality to avoid secondary leakage at the joints.
2. Waterproof Membrane Repair: It depends on construction techniques and has a lifespan of about 15 years, but there are failure cases. It is necessary to choose materials with strong weather resistance (such as SBS modified bitumen membranes) and ensure that the base layer is dry and flat.
3. Plastic Film Covering: It has the lowest cost (about 2 yuan per square meter), but the effect only lasts for 2 - 3 years, suitable for temporary emergency situations or scenarios with limited budgets. Regular inspections and replacements are required to prevent damage from wind and sun exposure.

Prevention Recommendations

• Material Selection: For newly built houses, try to avoid using prefabricated panels and give priority to materials with strong integrity such as cast-in-place concrete to reduce the risk of leakage from the source.
• Regular Maintenance: Houses that have used prefabricated panels need to inspect the roof annually, focusing on joints, waterproof layers, and material aging, and promptly repair cracks or replace failed materials.
• Long-Term Protection: Choose solutions based on climatic conditions. For example, in rainy areas, it is recommended to use color-steel roofs or high-quality waterproof membranes, while in arid areas, protection measures can be appropriately simplified.