Are Prefabricated Houses Prone to Water Leakage?

Prefabricated houses are relatively more prone to water leakage issues, primarily due to deficiencies in joint treatment, the quality of waterproof layers, and the design of splicing joints. Detailed analysis is as follows:

1. Defects in the treatment of prefabricated panel joints
The prefabricated panels in prefabricated houses are typically connected through grouting or welding to form a structural whole. However, these connection methods pose hidden risks during long-term use: on one hand, seismic activity or temperature changes causing thermal expansion and contraction can lead to stress concentration at the joints, resulting in cracking of the grout layer or loosening of the welds; on the other hand, if the joint treatment process does not meet standards (such as insufficient grouting density or insecure welding), it directly reduces the sealing performance of the joints. For example, in the case of the Hefei Sanxiaokou Qiguitang community, rainwater infiltrated through cracked prefabricated panel joints, creating a '串流' (water flow) phenomenon. Due to the concealed nature of the structure, repairs were difficult, ultimately leading to long-term leakage.

2. Weak quality of the waterproof layer on prefabricated panel roofs
The roof waterproof layer in prefabricated houses is a crucial barrier against water leakage, but in actual construction, cost or process issues often result in substandard quality. Statistical data from rural self-built houses shows that eight out of ten households experience rain leakage problems, and multiple repairs fail to provide a permanent solution. The core reason lies in non-standard waterproof layer construction: improper material selection (such as using ordinary coatings with poor weather resistance), insufficient coating thickness, and rough base layer treatment (such as failing to clean dust or repair cracks) all accelerate the aging and failure of the waterproof layer. Additionally, differences in the surface flatness of prefabricated panels may cause local air pockets in the waterproof layer, further reducing its waterproof performance.

3. Splicing joints as high-risk points for leakage
The splicing joints in prefabricated houses (such as those between balconies, walls, and roofs) are structural weak points. If design or construction does not fully consider drainage and sealing, they can easily become channels for water leakage. For example, water leakage on the east wall of a balcony may stem from the absence of a drainage channel or the aging and cracking of sealant at the splicing joint, allowing rainwater to seep into the interior along the gap. Such problems are particularly prominent during rainy seasons or windy weather, as wind pressure accelerates the infiltration of rainwater into the gaps, creating a '窜水' (water flow) phenomenon.

Summary
The risk of water leakage in prefabricated houses is not absolute, but it can be reduced by strictly controlling joint treatment processes, selecting high-quality waterproof materials and ensuring standardized construction, and optimizing splicing joint design. For existing houses, regular inspections of joint sealing, timely repairs of damaged waterproof layers, and cleaning of drainage systems are equally crucial maintenance tasks.