Waterproofing Treatment for Prefabricated Slab Houses

Waterproofing treatment for prefabricated slab houses requires a systematic renovation approach, addressing the characteristics of jointed structures, base layer defects, dynamic deformation, and gutter nodes through comprehensive construction. Traditional local seam patching or surface glue application cannot permanently resolve leakage issues.

I. Structural Characteristics and Leakage Challenges

The roof of a prefabricated slab house is composed of multiple independent concrete slabs joined together, with the primary leakage risks stemming from the following characteristics:

1. Slab Joint Issues: Slab joints are the main channels for water infiltration, prone to cracking and displacement due to long-term temperature variations and settlement, allowing rainwater to directly penetrate indoors.
2. Base Layer Defects: The base layer is susceptible to unevenness, sanding cracks, and other issues, creating pathways for rainwater to flow beneath the waterproofing layer, reducing overall waterproofing effectiveness.
3. Material Adaptability: Ordinary waterproofing materials lack sufficient tensile strength to cope with the dynamic deformation of prefabricated slab roofs, often failing due to cracking.
4. Gutter Vulnerability: The gutter area is constantly exposed to standing water and sunlight, causing ordinary materials to age rapidly, necessitating specialized weather-resistant techniques for enhanced protection.

II. Standardized Construction Process

1. Base Layer Preparation: Thoroughly remove obstacles from the roof surface and repair honeycomb cracks, loose sanding, and other defects to ensure a flat and solid base layer, providing a stable foundation for subsequent construction.
2. Slab Joint Reinforcement: Use rigid filling materials (such as specialized sealants) to reinforce slab joints, blocking through-seams and preventing rainwater penetration through the joints.
3. Full-Area Waterproofing: Lay national standard thickened waterproofing membranes (such as genuine Oriental Yuhong products) to cover the entire roof area, forming a continuous, seamless waterproofing layer that effectively resists rainwater intrusion.
4. Gutter Enhancement: Apply specialized exposed waterproofing materials (such as high weather-resistant asphalt coatings) to the gutter area to enhance UV and aging resistance, preventing leakage caused by standing water.
5. Warranty Service: Provide a 5-year written warranty upon completion of construction to ensure long-term resolution of leakage issues and reduce future maintenance costs.

III. Alternative Solutions for Reference

1. Color Steel Roofing: Installed by pressing metal sheets together as a whole, with anti-rust coatings for long-term leak prevention, lasting up to 20 years. However, the cost is relatively high (60-80 yuan per square meter), suitable for scenarios with sufficient budget and a pursuit of long-term effects.
2. Plastic Film Covering: Cover the roof with wide plastic film and secure it in place, with extremely low cost (2 yuan per square meter). However, the service life is relatively short (2-3 years), requiring regular replacement, suitable for temporary or low-cost needs.

Note: Leakage in prefabricated slab roofs requires resolution through systematic renovation. Local seam patching or surface glue application can only provide short-term relief and cannot permanently resolve the issue.