House Prefabricated Slab Repair

House prefabricated slab repair requires targeted solutions based on specific issues, typically including roof waterproofing repairs, structural reinforcement, and comprehensive renovation measures.

I. Repair Plan for Leakage in Prefabricated Slab Roofs

Prefabricated slab roofs are composed of multiple prefabricated concrete panels joined together. Cracks can easily form at the panel joints due to material shrinkage, temperature changes, or foundation settlement, leading to widespread roof leakage and dampness and mold on interior walls of the top floor. Traditional methods such as partial joint sealing or surface glue application only provide temporary relief and cannot address the root cause of leakage.
Recommended Solution: Taking the project at Room 1102, Building 72, Phase I of Zhonghuan Jiayuan in Putuo District, Shanghai as an example, a systematic repair process is adopted:

1. Full Roof Clearance: Remove the existing waterproof layer, debris, and loose base layers to ensure a flat construction surface.
2. Detailed Repair of Base Layer Defects: Repair defects such as honeycombs, pits, and cracks in the concrete base layer to enhance structural load-bearing capacity.
3. Rigid Filling and Reinforcement of Panel Joints: Use high-strength polymer mortar or epoxy resin to fill the panel joints, forming a rigid waterproof layer to prevent moisture penetration.
4. Full-Area Protection with National Standard Thickened Membranes: Lay SBS or APP modified bitumen waterproof membranes that comply with national standards, with a thickness of no less than 4mm, covering the entire roof area to form a continuous waterproof barrier.
5. Specialized Exposed Waterproofing Reinforcement for Gutters: For areas prone to water accumulation such as gutters and eaves, use weather-resistant exposed waterproof coatings or membranes for specialized treatment to extend service life.

II. Comprehensive Renovation Measures for Prefabricated Slab Houses

If the overall structure of the house is stable but there are aging issues in multiple areas such as the roof, exterior walls, and piping networks, comprehensive repairs are needed:

1. Roof Waterproofing Repair: In addition to the roof repairs mentioned above, check if the drainage system is unobstructed to prevent repeated leakage due to water accumulation.
2. Exterior Wall Detachment Treatment: Remove hollowed or cracked exterior wall finishes, relay insulation boards or plaster, and apply waterproof coatings to prevent rainwater intrusion.
3. Piping Network Renewal: Replace aging water supply, drainage, and gas pipelines with new corrosion-resistant and aging-resistant materials to ensure safety.
4. Fire Safety Facility Improvement: Add or repair fire hydrants, fire extinguishers, and emergency lighting systems to comply with current fire safety regulations.
5. Aging-Friendly Renovation: Install handrails and non-slip strips in stairwells, optimize lighting in public areas, and enhance living convenience.

III. Repair Precautions

1. Pre-Construction Inspection: Locate leakage points through infrared thermal imaging or water spray tests to avoid blind repairs.
2. Material Selection: Prioritize materials that are compatible with the original structure, such as elastic waterproof coatings that complement rigid filling layers.
3. Long-Term Maintenance: Regularly inspect the roof, exterior walls, and piping networks after repairs, and promptly address newly developed cracks or corrosion issues.

Through systematic repairs and comprehensive renovations, the durability and living comfort of prefabricated slab houses can be significantly improved, extending the building's service life.