Prefabricated Panels on the Roof of Husband's House

Common issues and handling methods for prefabricated panels on the roof of husband's house are as follows:

Common Causes of Water Leakage

• Expansion Joint Filler Issues: Cracking or detachment of the filler in the expansion joints of prefabricated panels is one of the common causes of water leakage. Since expansion joints need to accommodate the thermal expansion and contraction of the building structure, the filler may crack or detach over long-term use due to aging or environmental factors, allowing water to penetrate.
• Aging and Damage of the Waterproof Layer: Aging, damage, or hollowing of the original waterproof layer can also cause water leakage. Over time, the performance of waterproof materials deteriorates, and combined with the influence of the external environment, the waterproof layer is prone to damage and loses its waterproofing function.
• Blocked Drainage Troughs: If the drainage troughs on the roof are blocked, water cannot be discharged in a timely manner. Long-term immersion of the waterproof layer in water accelerates its aging and damage, leading to water leakage.
• Damage from Equipment Installation: When new equipment such as solar water heaters or antennas is installed on the roof, drilling operations may damage the original waterproof layer. If timely repair and waterproofing treatment are not carried out, it can create a potential for water leakage.

Technical Characteristics of Prefabricated Panels

• Principle: Building components with a certain strength are prefabricated in a factory and then transported to the site for assembly. Using molds, concrete is poured into the molds and cured with cement to form prefabricated panels, which have the characteristics of high process precision and stable quality.
• Advantages and Disadvantages:
  • Advantages: Good reinforcement effect, effectively avoiding adverse consequences caused by errors; short construction period, saving construction time; controllable project quality, as manufacturers can effectively control the quality of materials and finished products.
  • Disadvantages: High cost, as the production cost affects the overall project cost; high transportation equipment requirements, as prefabricated panels are heavy and require large-scale equipment for transportation.
• Application: Widely used in the reinforcement of old public housing, with methods such as capping walls and reinforcing beams for reinforcement and renovation. In cities with a concentration of old public housing such as Shanghai, it has become one of the main reinforcement methods.

Renovation Handling Suggestions

If there are cracks in the prefabricated panels, direct leveling will cause water to seep to the floor below. If leveling is chosen, waterproofing must be done first. Alternatively, wooden joists can be installed and covered with wooden boards. Installing joists has the effects of leveling the floor, preventing moisture, facilitating installation, and reducing noise. Laminate flooring has moisture-proof properties, so joists may not be necessary. Solid wood flooring requires the installation of a井字形 (grid-pattern) joist system to assist in moisture prevention and prevent deformation.