Roof Leakage in Prefabricated Panel Commercial Buildings

For roof leakage in prefabricated panel commercial buildings, targeted repair or rights protection measures should be taken based on the building's warranty period and the cause of the leakage, as detailed below:

I. Analysis of Leakage Causes

1. Structural Defects in the Jointed Design: Prefabricated panels are assembled from multiple independent panels, with the panel joints serving as continuous channels. These joints are prone to opening and closing displacements due to temperature variations, settlement, and loads, causing the waterproof layer to crack and delaminate, and forming continuous water seepage channels.
2. Hidden Leakage Due to Base Layer Defects: The surface of prefabricated panels is prone to issues such as unevenness, sanding, peeling, and honeycomb cracks. After prolonged water immersion, the base layer becomes loose and aged, allowing rainwater to flow beneath the waterproof layer, resulting in a mismatch between the leakage point and the seepage point.
3. Waterproofing Failure Due to Dynamic Deformation: Seasonal temperature variations cause thermal expansion and contraction of the prefabricated panels. Ordinary waterproofing materials lack sufficient tensile and deformation resistance, leading to short-term cracking and failure, with a higher recurrence rate of leakage compared to cast-in-place roofs.
4. Harsh Conditions in the Gutter Area: Gutters are prone to accumulating water, dust, and fallen leaves, and are subject to long-term rainwater erosion and ultraviolet exposure. Conventional waterproofing in these areas is prone to aging, pulverization, and peeling, making them high-risk nodes for leakage.

II. Repair Solutions

1. Comprehensive Roof Clearance: Thoroughly clean the existing waterproof layer and debris to ensure a flat base layer.
2. Repair of Base Layer Defects: Precisely repair issues such as unevenness, sanding, peeling, and cracks to restore the strength of the base layer.
3. Rigid Filling and Reinforcement of Panel Joints: Use specialized materials to fill the panel joints, enhancing stability and preventing water seepage.
4. National Standard Thickened Membrane Waterproofing: Use Oriental Yuhong national standard genuine waterproofing materials for comprehensive waterproofing, improving resistance to deformation.
5. Specialized Waterproofing Reinforcement for Gutters: For the gutter area, adopt specialized exposed waterproofing techniques to enhance weather resistance and aging resistance.

III. Responsibility Allocation and Rights Protection

1. During the Warranty Period: If the building is still within the 5-year warranty period, according to the Regulations on the Administration of Quality of Construction Projects and the Measures for the Administration of Quality Warranty for Housing Construction Projects, the developer is responsible for repairs. Homeowners should contact the developer to fulfill their warranty obligations.
2. Outside the Warranty Period: If the leakage is not caused by human damage or force majeure, and it involves public areas or shared facilities and equipment, the community or property management is responsible for repairs. Homeowners can submit a written repair request and retain evidence such as communication records, photos, and videos. If negotiations fail, they can file complaints with the local real estate administration bureau, community居委会 (neighborhood committee), or administrative authorities, or call 12315 to complain. If necessary, they can seek legal recourse.