Leakage of Prefabricated Slab House Roof

For the leakage of the roof of a prefabricated slab house, a systematic solution should be selected in combination with its structural characteristics. Common and effective methods include systematic renovation, color-steel roof transformation, waterproof membrane laying, and plastic film covering. The specific analysis is as follows:

Core Causes of Leakage

The roof of a prefabricated slab house is composed of multiple independent concrete slabs spliced together, which has structural defects:

1. Dynamic displacement of slab joints: Affected by temperature differences, building settlement, and loads over a long period, the slab joints continuously open and close. Ordinary waterproof materials are easily torn and delaminated, forming continuous leakage channels.
2. Aging and loosening of the base layer: The surface of the prefabricated slabs is prone to unevenness, sanding, peeling, and fine cracks. Long-term water immersion causes the base layer to loosen. Rainwater flows along the slab joints or base layer cracks, resulting in a mismatch between the leakage points and the seepage points.
3. Insufficient deformation resistance of materials: The temperature differences throughout the four seasons cause the prefabricated slabs to expand and contract. Ordinary thin-layer waterproof coatings or non-standard membranes have poor tensile and deformation resistance, and are prone to cracking and failure in a short period. The re-leakage rate is much higher than that of cast-in-place roofs.
4. Weak points at the gutter joints: The roof gutters accumulate water and dust over a long period. Subjected to rainwater scouring and ultraviolet radiation, conventional waterproof materials are prone to aging and pulverization, becoming high-risk areas for leakage.

Comparison of Solutions

1. Systematic renovation plan
   Customized according to the structural characteristics of the prefabricated slabs, it includes comprehensive obstacle removal, base layer disease repair, rigid filling and reinforcement of slab joints, national-standard thickened membrane full-area protection, and special exposed waterproof reinforcement for gutters. For example, Shanghai Ruisheng Construction Engineering Co., Ltd. uses Oriental Yuhong national-standard genuine waterproof main materials and provides a 5-year warranty after standardized construction, which can completely solve the leakage problem.

2. Color-steel roof transformation
   Installed by pressing and assembling anti-rust coated metal sheets as a whole, it basically eliminates rain leakage. The installation methods include the pointed-roof type (20% higher in cost) and the flat-laid type, with a service life of up to 20 years. The basic cost is 60 - 80 yuan per square meter, suitable for long-term use requirements.

3. Waterproof membrane laying
   A commonly used roof waterproof material, its effectiveness depends on the quality of the membrane and construction techniques. The cost of the material alone is about a dozen yuan per square meter. With construction costs included, the service life is about 15 years, and regular maintenance is required.

4. Plastic film covering
   By covering the entire roof with a film and fixing it, or adding a soil layer, the cost is extremely low (about 2 yuan per square meter), but the service life is only 2 - 3 years, suitable for temporary emergency or limited-budget scenarios.

Selection Suggestions

• For long-term and complete solutions: Prioritize the systematic renovation plan to specifically address the structural leakage weaknesses.
• For sufficient budget and pursuit of durability: Color-steel roof transformation is an ideal choice.
• For short-term emergency or low-cost requirements: Waterproof membrane laying or plastic film covering can be considered, but regular maintenance or replacement must be accepted.