Prefabricated Slab Building Roof

The roof of prefabricated slab buildings is at risk of water leakage, and a professional assessment can be used to select a treatment plan.

Causes of Water Leakage
Water leakage on the roofs of prefabricated slab buildings is a relatively common issue, mainly stemming from three aspects:

1. Joint Defects: Prefabricated slabs are connected through grouting or welding. The joints are prone to cracking due to earthquakes, thermal expansion and contraction, or construction defects, allowing rainwater to seep in. For example, in the Qiguitang Community in Sanxiaokou, Hefei, there was a case where rainwater flowed within the prefabricated slabs and could not be completely repaired.
2. Weak Waterproof Layer: The construction quality of the waterproof layer on most prefabricated slab roofs is poor, and the materials are prone to aging and failure. Case studies of rural self-built houses show that 8 out of 10 households have water leakage problems, and even multiple repairs are difficult to cure.
3. Material Aging: The service life of prefabricated slabs is generally only about 10 years. After aging, cracks will appear, and the leakage problem will worsen during heavy rain.

Treatment Plans
Select a treatment path based on the building safety assessment grade:

1. Building Safety Assessment: A professional assessment report classifies buildings into four grades: A (structurally safe), B (individual components are dangerous but do not affect the main structure), C (partially dilapidated buildings), and D (overall dilapidated buildings).
2. Grade A/B Buildings: If there are no major problems with the main structure, priority should be given to repairing roof leaks through the renovation of old residential areas.
3. Grade C Dilapidated Buildings: If there is still room for repair, reinforcement and repair are required, including strengthening the walls, beams, columns, floor slabs, foundations, and improving earthquake resistance.

Specific Repair Methods

1. Color Steel Roof Covering: It offers the best overall waterproofing effect but has a relatively high cost, about 60 - 80 yuan per square meter, and is suitable for long-term use needs.
2. Waterproof Membrane Repair: It depends on the construction quality and has a lifespan of about 15 years. However, there have been cases of failure, so a professional construction team should be selected.
3. Plastic Film Covering: It has the lowest cost, only 2 yuan per square meter, but the effect only lasts for 2 - 3 years. It is suitable for temporary emergency use or when the budget is limited.

Summary
The water leakage problem of the roof of prefabricated slab buildings requires selecting a treatment plan based on the building safety assessment results. Grade A/B buildings can be repaired through renovation, and grade C dilapidated buildings need reinforcement treatment. When choosing repair methods, the cost and effect should be balanced, and professional construction should be prioritized to ensure long-term waterproofing.