Container House Leak Repair

The repair of leaks in container houses requires targeted treatment based on the cause of the leakage, with core steps including identifying leak points, cleaning the base layer, treating seams and joints, selecting appropriate materials, and following standardized construction practices.

I. Identifying the Cause and Location of Leaks
Common causes of leaks in container houses include:

1. Loose fasteners or aging waterproof pads: Prolonged foot traffic on the roof or aging can lead to the failure of fastener waterproofing;
2. Substandard or improperly handled waterproof materials: The use of inferior materials during construction or the failure to waterproof seal areas such as panel seams, openings for fans/exhaust pipes, etc.;
3. Structural deformation or poor drainage: Wind loads, snow loads, or thermal expansion and contraction can cause panel deformation, leading to the expansion of cracks at joints; a lack of slope in gutters, clogged outlets, or inadequate corrosion protection can result in water accumulation and backflow.
   Leak points should be located through visual inspection, water spray testing, or infrared thermal imaging, with a focus on areas such as welds, seams, window and door closures, and gutters.

II. Base Layer Treatment and Joint Reinforcement

1. Cleaning the base layer: Remove loose or hollow old waterproof layers, clear away welding slag, dust, and rust, ensuring the base layer is flat, dry, and free of oil stains;
2. Repairing cracks and defects: Fill cracks with waterproof mortar or epoxy resin, and add waterproof reinforcement layers to stress-concentrated areas such as the internal and external corners of parapet walls and the roots of pipes;
3. Optimizing the drainage system: Clear gutters and drainage outlets, adjust the roof slope (slope ≥ 2%) to prevent water accumulation; gutters should be corrosion-protected and equipped with reasonable outlets.

III. Material Selection and Construction Points

1. Seam sealing:
   • Weld leaks: Use chloroprene rubber-based sealant (such as Jitai 123) for brushing, which has strong weather resistance (-20℃~80℃), bonds firmly with metal, and does not detach due to thermal expansion and contraction;
   • Panel seams: Use waterproof membranes + sealant for full sealing, design a reasonable drainage slope to ensure uninterrupted water flow along the joints.
2. Overall waterproof layer:
   • Flat roofs: Select SBS modified asphalt membranes or polyurethane waterproof coatings that are UV-resistant and aging-resistant, ensuring firm adhesion to the base layer and avoiding hollowing;
   • Sloped roofs: For tiled roofs, check for tile displacement and aging of seam sealing materials, and repave and seal the ridge joints.
3. Special part treatment:
   • Window and door closures: Seal gaps with waterproof mortar or sealant and add water baffles;
   • Fans/exhaust pipes: Wrap the openings around with waterproof sleeves and fill with elastic sealing materials.

IV. Construction Pitfalls to Avoid and Acceptance

1. Avoid skipping base layer treatment: Directly laying materials can easily lead to the separation of new and old layers, requiring thorough cleaning before construction;
2. Do not perform local repairs: If the waterproof layer is extensively aged, it requires overall renovation rather than local repairs;
3. Acceptance criteria: Conduct a 24-hour water closure test after construction, confirm no leaks before covering with a protective layer to extend the lifespan of the waterproof layer.